FLOOD PROFILES IN THE UMPQUA RIVER BASIN,' OREGON PART 2

Transcription

1 r FLOOD PROFLES N THE UMPQUA RVER BASN,' OREGON PART 2

2 UNTED STATES DEPARTMENT OF THE NTEROR GEOLOGCAL SURVEY FLOOD PROFLES N THE UMPQUA RVER BASN, OREGON By Eugene A. Oster part 2. Umpqua River, Scottsburg to Hubbard Creek North Umpqua River, Winchester to dleyld Prepared in cooperation with DOUGLAS COUNTY OPEN-FLE REPORT Portland, Oregon

3 CONTENTS Page ntroduction i Description of the study reaches 2 Floods in the Umpqua River basin 4 Study methods 6 Photogrammetric mapping 6 Collection of field data 7 Roughness coefficients 7 Step-backwater analysis 8 Results of the study 8 Umpqua River 9 North Umpqua River 11 Use of the results 13 Summary 13 Revisions to part 1 profiles 13 References 14

4 LLUSTRATONS Page Figure 1. Map showing location of study area 3 Stage hydrograph of Umpqua River near Elkton, flood of December Flood-frequency curves for selected gaging stations 6 Stage-discharge relation, Umpqua River near Elkton 1 Stage-discharge relation, North Umpqua River at railroad bridge at Winchester 11 Stage-discharge relation, North Umpqua River near Glide 12 7 to 37. Graphs showing water-surface profiles to 85. Cross sections

5 TABLES Page Table 1. Annual peaks for Umpqua River near Elkton, Oreg. (gaging station 321) 16 Annual peaks for North Umpqua River at Winchester, Oreg. (gaging station 3195) 17 Annual peaks for North Umpqua River near Glide, Oreg. (gaging station 3185) 18 Discharges used to develop the flood profiles 19 Profile elevations for Umpqua River 2 Profile elevations for North Umpqua River, Winchester to dleyld Park 26 Revised profile elevations for South Umpqua River 29 Revised profile elevations for North Umpqua River, mouth to Winchester Dam 34 ill

6 FLOOD PROFLES N THE UMPQUA RVER BASN, OREGON Part 2 By Eugene A. Oster NTRODUCTON The elevations and characteristics of floods are major factors that influence land-use planning of the flood plains of any stream. As the lowlands become more intensively used, it becomes increasingly important to have a firm basis for assessing the risk of flood damage. Land-use zoning is not only a legal requirement passed by the Oregon State Legislature in 1969; it is necessary to ensure a use compatible with the risk of flood damage. The approximate areas flooded in 1955 and 1964 in the Umpqua River basin upstream from Coles Valley are shown in an interim report (Corps of Engineers, 1966). However, there are no published flood-elevation profiles. Such profiles are needed to delineate areas inundated by floods of a specific recurrence interval and to establish land-use zone boundaries. This study was made at the request of Douglas County to develop profiles for the 1-, 25-, 1-, and 5-year floods and the December 1964 flood. This report is the second in a series of three reports that will cover approximately 3 miles of Umpqua River basin streams. Although the three reports are intended as a series, some introductory and explanatory material is repeated in each, so that each report can stand independently. The reaches covered by this report are: Umpqua River from Scottsburg upstream to Hubbard Creek, and North Umpqua River from Winchester Dam upstream to dleyld Park. The reaches covered by flood profiles in the Umpqua River basin, part 1 (Oster, 1972), are: Umpqua River above Hubbard Creek, North Umpqua River below Winchester Dam, and South Umpqua River and parts of selected tributaries below Days Creek.

7 A profile of the Umpqua River was computed for the 1-year flood adjusted for storage in the proposed Days Creek Lake on the South Umpqua River above Days Creek. Profile elevations were also computed for the 2-year and 5-year floods and are available for inspection in the Oregon District office of the U.S. Geological Survey. The step-backwater method was used to compute high-water profiles; photogrammetric maps and water-depth soundings were used to determine the low-water and thaiweg profiles. The theory of the step-backwater method is described in detail in U.S. Geological Survey Water-Supply Paper 1869-A (Bailey and Ray, 1966) and in many textbooks on hydraulics. The method uses hydraulic equations expressed as functions of channel geometry, roughness, and slope. This report presents the data needed to determine areas subject to inundation by the selected floods. Flooded areas can be determined by transferring the flood-profile elevations and the flooded width shown on the cross sections to the orthophoto work maps. This study was made in cooperation with Douglas County, under the general supervision of Stanley F. Kapustka, Oregon district chief of the Water Resources Division of the U.S. Geological Survey, and under the direct supervision of David D. Harris, chief of the Hydrologic nvestigations Section. Many thanks are due to Berl Oar, of Douglas County Water Resources Survey, whose help in locating many high-water marks and bench marks greatly expedited the collection of field data. Douglas County also furnished stage readings obtained by the National Weather Service on the North Umpqua River at Winchester Dam. These readings were of great value in developing a stage-discharge relation to begin the stepbackwater computations, and are much appreciated. Several people on the district staff of the U.S. Geological Survey contributed much patient work, without which the presentation of this report would have been impossible. Those deserving special recognition and praise are Antonius Laenen for his help with computer processing of the data; Alexander Gonsalves, who prepared the illustrations; and Nyra Johnson, who typed and edited the manuscript. DESCRPTON OF THE STUDY REACHES The study reach on the Umpqua River begins at the highway bridge in Scottsburg and extends 71 miles upstream to the mouth of Hubbard Creek (fig. 1). The river is deeply entrenched, and the valley plains are narrow, ranging from a few hundred feet to about half a mile wide. Except for the towns of Elkton and Scottsburg, the reach is sparsely populated. The arable flood-plain lands are used for hay meadows and orchards. The upland hills are densely covered with conifer forest. Average channel slope ranges from 3 to 5 feet per mile.

8 The study reach on the North Umpqua River begins at Winchester Dam and extends 27 miles upstream to dleyld Park (fig. 1). The river is deeply entrenched and flows through canyons that connect valleys whose flood plains are generally less than a quarter of a mile wide. Channel slope averages 11 feet per mile. The upland hills from Winchester to Glide are grass covered, with scattered stands of deciduous trees. Upstream from Glide the grasslands and oak thickets merge into conifer forest. n the valleys near Glide there are small orchards and cultivated hay meadows. FLOODS N THE UMPQUA RVER BASN The highest annual flows in the Umpqua River 1?asin usually occur from November through March as a result of heavy winter rains augmented by snowmelt. Annual peak flows for gaging stations on the Umpqua and North Umpqua Rivers are shown in tables 1 to 3. At the gaging station near Elkton, the flood of December 1964 reached a stage 6.5 feet higher than the historic flood of 1861, which was equaled by the flood of December On the North Umpqua River the flood of 1964 was the highest since at least 196, as shown by streainflow records at several sites from near the mouth to above dleyld Park. A stage hydrograph of the December 1964 flood at the gaging station near Elkton is shown in figure 2. Because the recording instruments were submerged a few hours before the peak, the recession of the flood is estimated by comparison to the gage record for South Umpqua River near Brockway. Steel bridge girders found in the Umpqua River 4½ miles downstream from Elkton bear mute testimony to the destructive power of floods. The county road department reports (oral commun., July 17, 1973) that these girders were lost during reconstruction of the Beckley Bridge in Elkton during 1927 and were carried a quarter of a mile downstream by the flood of Succeeding floods moved them farther downstream. Several bridges in the Umpqua River basin were severely damaged or destroyed during the flood of December Flood-frequency curves for the gaging stations on the Uinpqua and North Umpqua Rivers are shown in figure 3. The curves were developed from annual peak-flow data using the log-pearson type method. The recurrence interval, in years, is the average period in which a given event might be equaled or exceeded. t should not be construed to imply any regularity of occurrence. The recurrence interval can be taken as a reciprocal of the probability of occurrence. A 1-year flood would have one chance in 1, or a 1 percent chance, of occurring in any year. A 1-year flood has one chance in 1, or a 1 percent chance, of occurring in any year. As drawn, the frequency curves are shown as a solid line to twice the period of record and are extended as a dashed line to estimate higher floods up to the 5-year flood. 4

9 EXPLANATON Stream-gaging station S r NDEX MAP OF OREGON Figure 1. --Location of study area.

10 14 -Pc- Elevation of terrace Bankfull stage (at gage) 13 u:l \ 1 Recording instruments submerged by flood 1 a.m. December 23. Peak elevation determined from floodmark; recession estimated by comparison with South Umpqua River near Brockway and once-daily staff-gage readings after December DAY, DECEMBER 1964 Figure 2. --Stage hydrograph of Umpqua River near Elkton (station 321), flood of December 1964.

11 z C!) cz;i 5 it - -_ H H 2 t - - (9 5 - est... abo.je, - iq RECURRENCE NTERVAL, N YEARS Figure 3. --Flood-frequency curves for selected gaging stations. Discharges used to develop the flood profiles are shown in table 4. On the Umpqua River, discharges upstream and downstream from the gaging station were determined in proportion to drainage area. On the North Umpqua River, streamflow records for Little River and Rock Creek near Glide were used together with drainage area to determine flood discharges along the study reach. Streamf low records'of the North Umpqua River were extended by correlation to records of Umpqua River near Elkton (321) to provide a longer time base for the frequency analysis. The resulting frequency curve was significantly lower than the curve based on the period of record alone. t was considered well to recompute the profiles in the reach of the North Umpqua River below Winchester Dam; the recomputed profiles will supersede those published in part 1 of this series. STUDY METHODS Photogrammetric Mapping Channel-geometry data required for the step-backwater analysis were furnished by a commercial photogrammetry firm. They produced orthophoto work maps (scale 1 in. = 4 ft) from aerial photographs, with 6

12 horizontal and vertical map control established to third-order accuracy at primary picture ground-control points. An orthophoto map is an aerial photo mosaic completely corrected for scale and distortion, and is as accurate as a plotted map. The orthophoto map shows all the detail visible on the photograph and includes much detail that would be omitted from a plotted map. Spot elevations, 5-foot ground contours, cross-section locations, and lettering were added. All elevations are given in feet above mean sea level. Cross sections were positioned perpendicular to the direction of flow in the channel and., where necessary, were angled to be perpendicular to the flow across the flood plain. Cross-section ground elevations were determined at 1-foot intervals and at topographic breaks across the flood plain. Accuracy of cross-section elevations was to be within ±1 foot for 9 percent of the points where ground surface was visible in the aerial photographs. Contour accuracy was to be within half a contour interval for 9 percent of the area mapped where the ground surface was not obscured by vegetative cover. The originals of the orthophoto work maps, not intended for publication, are available for inspection in the office of the Douglas County Planning Department. Collection of Field Data Cross-section locations were selected in the field, and water-depth soundings were made prior to the photogrammetric mapping. To complete each channel cross section, the sounded water depths were later added to the photogrammetric ground elevations. Cross sections were spaced about 1,-1,2 feet apart, on the average, and at principal breaks in the channel gradient. A few additional cross sections were scaled from the photo map after the fieldwork had been completed. The bridges in the project reach were examined in the field and, based on past experience, judged to have little or no constricting effect on floodflows. The elevations of documented high-water marks were determined by leveling to nearby bench marks and were used to verify the accuracy of the computed profiles. Roughness Coefficients Channel roughness coefficients required in the hydraulic computations were selected in the field for subreaches through each cross section. Verbal description of bed material and color-slide photographs of the channel were used to aid in office review of the coefficients selected. The aerial photographs were used to assist in selecting roughness coefficients for the flood plain. 7

13 Step -Backwater Analysis A digital computer was used to make the large number of calculations required in the step-backwater process. The profiles are developed by beginning at the farthest downstream cross section with a known or computed stage-discharge relation and progressively computing profile elevations upstream from cross section to cross section. On the Umpqua River, step-backwater computations were started at Scottsburg, using an estimated stage-discharge relation based on highwater marks of the December 1955, December 1964, and January 1971 floods, and a low-water elevation. Between cross sections 12 and 13 the step-backwater computations were adjusted to match the stage-discharge relation curve for Umpqua River near Scottsburg (3229). This curve was defined by current meter to 53, cfs and extended on the basis of high-water-mark elevations and the shape of the step-backwater curve. The discharge of the December 1964 flood was computed on the basis of drainage area and unit runoff below Umpqua River near Elkton (321). At cross section 134, the stage-discharge relation for gaging station 321 was used to continue the step-backwater computations upstream. That stage-discharge relation was defined by current meter to 2, cfs and a slope-area determination of discharge at 28, cfs. On the North Umpqua River at Glide, step-backwater computations were broken and restarted from an estimated stage-discharge relation above the mouth of the Little River. A very large rock outcrop in the channel and the flow of the Little River colliding head on with the North Umpqua River (see fig. 35) cause considerable pileup of water at this location. A relation was estimated based on a high-water mark and a low-water elevation. Step-backwater computations were continued upstream, starting from the estimated relation. RESULTS OF THE STUDY Profile elevations for the selected flows are shown in tables 5 and 6. The distances shown were measured along the stream channel by the photogrammetry contractor. The computed profiles, together with maps of the area, are shown in figures 7 to 37. The profiles can be related to the adjacent maps for location of cross sections. The stream boundaries shown on the maps and the low-water elevations shown on the profiles are for the days of aerial photography, Nay 27, 1972, on the North Umpqua River and May 3, 1972, on the Umpqua River. The late summer flows of August and September can be expected to be 2-3 feet lower. Plots of the cross sections are shown in figures 38 to 85. On the Umpqua River, a profile was computed for the 1-year flood adjusted for storage in the proposed Days Creek Lake on the South Umpqua

14 River. The adjusted discharge was furnished by N. C. Hosea, Corps of Engineers (oral commun., November 11, 1971), for the gaging station near Elkton and was extrapolated upstream and downstream on a drainage-area ratio. Elevations along this profile are listed in table 5. Umpqua River The step-backwater computations were started at the Scottsburg bridge from an estimated stage-discharge relation based on high-water marks. From cross section 3 to 11 it was necessary to adjust the stepbackwater computations to a profile defined by high-water marks. Local residents report that extreme high tide affects river stages upstream to cross section 8. The gaging station Umpqua River near Scottsburg (3229) was located on the right bank (facing downstream) between cross sections 12 and 13. The step-backwater profiles were adjusted to an estimated extension of the stage-discharge relation, which was defined by current meter to 53, cfs. Two high-water marks on the right bank and one approximate high-water mark on the left bank, pointed out by residents, show 3 to 3.5 feet of lateral slope from the right bank to the left bank. The profiles shown are the average of this lateral slope. From cross section 13 to 3, the computed profile agrees very well with known highwater marks. From cross section 33 to 92 the computed profiles were adjusted to agree more closely to a profile based on high-water marks. At sec'tions 94 and 96, the computed profile agrees well with known high-water marks. At cross section 96, in Elkton above the mouth of Elk Creek, three high-water marks on the right bank and one on the left bank show 2.4 feet of lateral slope from right to left. The pileup is on the right bank, on the outside of a sharp curve, where Elk Creek water would influence the stage of the river. Another high-water mark, across Elk Creek, 1.4 feet lower in elevation, may reflect an eddy current. Still another high-water mark, on the left, at the outer edge of the flood plain, is.7 foot lower than the high-water mark on the left bank of the main channel. The 'computed elevation is.5 foot lower than the three right-bank high-water marks and.7 foot higher than the average of left bank and right bank marks. Between cross sections 96 and 134, one high-water mark was found, at section 117, about 2 feet higher than the computed elevation. This mark is at the edge of a flood plain 2, feet wide and may not truly represent water surface at the channel. Because marks defining high water are inadequate in this area, the profiles are accepted as computed. At gaging station Umpqua River near Elkton (321), at cross section 134, the stage-discharge relation is defined by current meter to 2, cfs and by a slope-area determination of discharge at 28, cfs. The step-backwater computations agree very well with this relation (fig. 4)

15 15 12 C.: Terrace -- Bankfull ç,44 a zh çe C,' 1 2, 1, DSCHARGE, N CUBC FEET PER SECOND 5, Figure 4.--Stage-discharge relation, Umpqua River near Elkton (station 321). within the limits of its definition. Computations were continued upstream using the relation defined by current meter. Cross sections 136 to 177 lie in an isolated, uninhabited canyon. No high-water marks were found. From cross section 167 to 186, the computed profiles were adjusted to agree with a water stain on a building at cross section 178. The computed profile agrees very well with a mark at cross section 188. From cross section 191 to 26 the computed profiles were adjusted to a profile based on marks at cross sections 192, 199, and 22. From cross section 27 to 236, high-water-mark data were inadequate to define a profile. The computed profiles from cross section 237 to 268 agree with known high-water marks. At cross sections 296 and 297 there is a disagreement of several feet between three high-water marks--two of them spikes set by other agencies and the other an approximate location pointed out by a resident. The computed profile agrees very well with the approximate location and splits the difference of the other two. The profile was allowed to stand as computed. From cross section 298 to 333, the end of the project reach, highwater marks are sparse and inadequate. The computed profile agrees well with a mark at cross section

16 At cross section 333 the computed profiles are 2 to 2.5 feet higher than the estimated stage-discharge relation that was used to start the computations of part 1 of this series. Computations were continued upstream to the lower end of Coles Valley; the profiles merged well at cross section 4 of part 1 and are presented as an addition to table 5 of this report, superseding the elevations published in part 1. North Umpqua River On the pier of the railroad bridge at Winchester there is an old staff gage that was used prior to 193. The stage-discharge relation for this gage was defined by current meter to 4, cfs and extended logarithmically to bankfull. The channel bottom is rough bedrock, with no possibility of scour. The step-backwater computations of 1973 agree very well with this old relation below bankfull (fig. 5) Bankfull 43 H C, 422 1, 1, DSCHARGE, N CUBC FEET PER SECOND Figure 5. --Stage-discharge relation, North Umpqua River at railroad bridge at Winchester (station 3195). 11

17 The staff gages for gaging station North Umpqua River near Glide (3185), 1 mile below Glide, are still standing and in good condition. The stage-discharge relation for this gage was defined by current meter to 4, cfs and extended logarithmically to bankfull. The channel bottom is rough bedrock, with no possibility of scour. The stepbackwater computations of 1973 agree very well with this old relation below bankfull (fig. 6). 688 Cl) 668 E- an1fu _ F' C H 2 o H 658 C,', r 653 1, 1, DSCHARGE, N CUBC FEET PER SECOND Figure 6. --Stage-discharge relation, North Umpqua River near Glide (station 3185). High-water-mark information is totally lacking or inadequate for long reaches of the North Umpqua River below cross section 95. From cross section 95 to 125 the step-backwater checks the available highwater marks quite well. Above cross section 118, above Lone Rock bridge, all floods are well confined within high banks At cross section 118, on the left bank (facing downstream) above Lone Rock bridge, high-water marks of the December 1964 flood and January 1971 flood are 3.2 feet and 1.5 feet higher than the computed elevations. This is an area where floodwater would pile up on the left bank while making a sharp bend to the right to pass through the bridge opening. Three feet of pileup is consistent with experience elsewhere and is quite credible. 12

18 USE OF THE RESULTS Elevations from the computed profiles (figs. 7-37) can be used in conjunction with the plotted cross sections (figs ) to determine the width of he area subject to flooding. This width can be transferred to a suitable topographic map to determine the area inundated by each flood. f the contour interval of the map is sufficiently small, the flood-profile elevations can be plotted directly on the map to determine the inundated area. The plotted cross sections can also be used to determine the stage at which overbank flow occurs and where water might be ponded in low areas of the flood plain. The 5-year flood profiles should be considered as estimates because of the comparatively short period of streamflow record on which the frequency analysis was based. The step-backwater method of computation assumes a level water surface across the width of the river. Sharp channel curvature or a strong tributary inflow can superelevate the water surface by several feet from bank to bank. n using the results of this study, allowance should be made for this superelevation and for backwater in areas vulnerable to catching debris. t should also be recognized that overbank flow can become separated from the main channel and continue at a higher elevation on the flood plain than in the main channel. Such conditions are extremely difficult to simulate. The computed profiles are based on channel conditions at the time of the survey. Debris jams during a flood can cause varying amounts of backwater that are impossible to predict. Future channel changes or constriction of the flood plain could also change flood elevations in the affected reach. SUNMRY Flood elevations for the selected reaches of the Umpqua River basin are presented in graphic and tabular form. To give a concept of range in stage, a low-water profile is included. The profiles presented are in reasonably good agreement with documented high-water marks and stagedischarge relations defined by current meter. REVSONS TO PART PROFLES A revision of the stage-discharge relation for gaging station South Umpqua River near Brockway (312) requires the published peak discharge of the December 1964 flood to be revised from 15, cfs to 125, cfs. This revision was based on information generated by, and compiled after, the publication of part 1 of this series. On the basis of this revision, it was necessary to recompute the profile of the December 1964 flood from near the mouth to near Tn-City. This revised profile (table 7) supersedes the one published in part 1 of this series. The flood-insurance study made in 1973 for Winston included a recomputation of the step-backwater from the gaging station near Brockway. 13

19 Because of the revision of the stage-discharge relation at the gage and the recomputation of the bridge constriction and road overflow at cross sections 19 and 127, the several profiles were revised from cross section 17 to 136. The frequency analysis was reexamined in light of the new data and found to be changed less than 1 percent. The corresponding profiles are unchanged except as noted above. On the North Umpqua River, step-backwater computations past the old gaging stations near Glide and at Winchester check the old stagedischarge relations very well. High-water marks found near each of these old gages shown the published figure of discharge for the December 1964 flood to be in error. The 1964 flood discharge at Winchester was revised from 119, cfs to 15, cfs. This revised discharge was used in a revision of the frequency analysis mentioned on page 6. This revision also required a revision of the stage-discharge relation above bankfull at gaging station North Umpqua River at Winchester (3195). Because of the revisions it was considered necessary to recompute the profiles in the reach of the North Umpqua River below Winchester Dam. Those recomputed profiles (table 8) supersede those published in part 1 of this series of reports. REFERENCES Bailey, J. F., and Ray, H. A., 1966, Definition of stage-discharge relation in natural channels by step-backwater analysis: U.S. Geol. Survey Water-Supply Paper 1869-A, 24 p. Oster, E. A., 1972, Flood profiles in the Umpqua River basin, Oregon, part 1: U.S. Geol. Survey open-file rept., 119 p. U.S. Army Corps of Engineers, 1966, Flood plain information, Douglas County, Oregon: U.S. Army Corps Engineers interim rept., 35 p. 14

20 Table 1. --Annual 'eaks for Urn ua River near Elkton Ore:. (station 321) Elevation Water (in feet Discharge year Date above msl) (in cfs) Site near downstream side of Smith Bridge 1862 Dec , 196 Jan. 17, ,4 198 Dec. 26, , 199 Jan. 2, ,2 191 Nov. 23, , 1911 Nov. 29, , Jan. 13, , 1913 Jan. 18, , 1914 Jan. 26, , 1915 Feb. 3, , Feb. 7, , 1917 Mar. 25, , Jan. 13, , 1919 Jan. 19, , 192 Dec. 9, , Dec. 3, , 1922 Nov. 3, , 1923 Jan. 6, , 1924 Dec. 7, , Dec. 3, , 1926 Feb. 5, , 1927 Feb. 21, , 1928 Mar. 27, , 1929 Apr. 15, ,7 45,4 193 Dec. 2, , 1931 Apr. 1, , 51, 1932 Mar. 19, , 1933 Jan. 3, , 1934 Jan. 24, , Dec. 2, , Jan. 13, , 1937 Apr. 14, , 1938 Feb. 7, , 1939 Mar. 13, ,3 194 Feb. 29, ,5 15

21 Table 1. --Annual peaks for Umpqua River near Elkton, Oreg. (stat ion 321) --Continued Water year Date Elevation (in feet above msl) Discharge (in cfs) 1941 Dec. 27, , Dec. 19, , Dec. 31, , 1944 Nov. 5, , 1945 Feb. 14, , Dec. 29, , 1947 Dec. 14, ,2 74, 1948 Jan. 7, , 1949 Dec. 12, , 195 Jan. 22, , 1951 Oct. 3, , 1952 Feb. 2, , Jan. 19, , 1954 Nov. 23, , 1955 Dec. 31, , Dec. 22, , Site 1, feet downstream from Smith Bridge 1957 Dec. 12, , 1958 Dec. 21, , 1959 Jan. 12, ,2 95,2 196 Feb. 9, , Feb. 11, , 1962 Nov. 23, , 1963 Dec. 3, , Jan. 2, , 1965 Dec. 23, , 1966 Jan. 4, , 1967 Jan. 28, , Feb. 23, , Jan. 13, ,3 197 Dec. 21, , 1971 Jan. 18, , 21, 1972 Mar. 3, , 16

22 Table 2. --Annual peaks for North Umpqua River at Winchester, Oreg. (station 3195) Elevation Water (in feet year Date above msl) ( in cfs ) Discharge Site at Southern Pacific Railroad bridge at Winchester, river mile Jan. 21, ,4 191 Nov. 23, , 1911 Nov. 28, , 1912 Jan. 12, , Mar. 3, , Dec. 29, , Dec. 3, , 1926 Feb. 4, , Feb. 2, , Mar. 11, , Mar. 21, ,9 1/1951 Oct. 29, , Site 4 feet downstream from county bridge, mile 1.8 at river 1954 Nov. 23, , 1955 Dec. 31, , Dec. 22, , Dec. 11, , Dec. 21, , Jan. 27, , 196 Feb. 8, , 1961 Nov. 25, , Nov. 23, , 1963 Dec. 2, , 1964 Jan. 2, , 1965 Dec. 22, V15, 1966 Jan. 6, , Jan. 28, , 1968 Feb. 23, , Nov. 9, , 197 Dec. 21, , Jan. 18, , Mar. 3, ,9 1/ Not previously published. 2/ Revised. 17

23 Table 3. --Annual peaks for North Jmpqua River near Glide, Oreg. (station 3185) Water year Date El evat ion '(in feet above msl) Discharge (in cfs) 191 Nov. 22, , 1916 Nov. 25, , 1917 Apr. 11, , Jan. 12, , Jan. 17, ,1 192 Nov. 3, , Nov. 21, , 1928 Mar. 11, , Apr. 14, ,3 193 Dec. 19, , Apr. 1, , 1932 Mar. 19, , Jan. 2, , Jan. 23, , 1935 Dec. 2, , Jan, 4, , 1937 Apr. 14, ,2 44, Jan, 22, , Oct. 29, , 1956 Dec. 22, , Dec. 22, , 1/ Not previously published. 18

24 Table 4.--Discharges used to develop the flood profiles Discharge, in cubic feet per second Gaging11 station 1-year flood 25-year flood 1-year flood 5-year flood December 1964 flood North TJmpqua River above Rock Creek, near Glide (3175) 48,9 61,2 81, 15, North Umpqua River near Glide (3185) 72, 94,4 135, 191, 138, North Umpqua River at Winchester (3195) 76,9 1, 142, 2, 15, Umpqua River near Elkton (321) 175, 22, 294, 385, 265, 1/ Number following station name is the gaging station number. 19

25 Table 5. --Profile elevations for the impqua River above Scottsbur Distance up- Elevation, in feet above mean sea level stream from Scottsburg 1-year December Cross bridge flood year 1-year 25-year 1-year Low 2/ section (feet) (adjusted)- flood flood flood flood flood water Thalweg , , , , , , , , , , , Gaging station ,35 Wells Creek 13, , , , , , , , , , , , , Burchard Creek 27, , , , , , , Weatherly Creek 33, , , , , Lutsinger Creek 38, , , , L , , , , , , , , , , , , , , , , , , , , Footnotes at end of table. 2

26 Table 5. --Profile elevations for the Umpqua River above Scottsburg--Continued Cross section Distance upstream from Scottsburg bridge (feet) 1-year flood (adjusted)1' December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thaiwesa 57 Paradise 62, Creek 62, , , , , , , , , , , , Sawyer Creek 78, , , , , , , , , , , , , , , , , , , , , , , , , ,775 L , , Elk Creek 19, , Beckley ridge 11, , , , , , , , , , , , , , , , , , , , , Footnotes at end of table. 21

27 Table 5.--Profile elevations for the Umpgua River above Scottsburg--Continued Cross section Distance upstream from Scottsburg bridge (feet) Footnotes at end of table. l-year flood (adjusted)i / December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water ThalwegV , , , , , , , , , , , , , , , , , , Gaging station , , Smith Bridge 153, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

28 Table 5.- -Ptofile elevations or the Jmpqua River ii,ove Scotsbur --Continued Cross section Distance up- Stream from Scottsburg bridge (feet) 1-year flood (adjusted)11' December 1964 flood Elevation 5-year flood in feet above mean sea level 1-year flood 25-year flood 1-year flood Low water ThalwegV , , , , , , , , , , , , , , , , , , , , , , , , Kellogg Bridge 225, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Yellow Creek 265, , , , , , , Bullock Bridge 27,295 Footnotes at end of table. 23

29 Cross Section Distance upstream from Scottsburg bridge (feet) Footnotes at end of table. Table 5.- Profi1e eiev.tons tor th thnpqa aiver above Scottslrnr - -Coot inued 1-year flood (adjusted) December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thalwe , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Wolf Creek 325, , , , , Tyee access bridge 33, , , , , , ,

30 Table 5.--Profile elevations for the Umpqua River above Scottsburg--Continued Cross SectiOn Distance upstream from Scottsburg bridge (feet) 1-year flood (adjusted)l December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thalwee2/ , , , , , , , , , , , , , , , , , , , , , , , , , , p , , , , / , /334 32, / , / , / Adjusted for storage in proposed Days Creek Lake. 2/ Thalweg, low point in channel. 3/ Cross sections correspond to cross Sections 1-4 of part 1 (1972) and supersede those shown in part 1. 25

31 Cross section Table 6.--Profile elevations for the North Umpqoa River. Winchester Dam to dleyld Park Distance upstream from Winchester Dam (in feet) See footnotes at end of table. December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thalweg- V , Ji 4, , V6 6, , V8 7, V9 8, , l 1, , , , V15 15, , a'17 17, , , , , , , , L , V26 28, , , , , , , , , , , , , V39 43, , , , , , Dixon Creek 45 51, a'46 52, , , Clover Creek 49 55, Vs 56, , , , , V55 62, , , Oak Creek 64, 58 65, , , , , ,

32 Table 6.--Prof lie elevations for the North Umpqua River. Winchester Dais to dlevid Park--Continued Cross section Distance upstream from Winchester Dam (in feet) December 1964 flood Elevation, n feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water 1/ Thalweg , , , , , , , , , , , , , Cooper Creek 77 85, , , , , , , , , , , Huntley Creek 88 97, , , , , , , , , , , Floyd Frear Bridge 17, 99 18, Gaging station ,5 1 19, , , , , , , , Little River 115, , , , , , , , , , French Creek , , Lone Rock Bridge 125,87 See footnotes at end of table. 27

33 Table 6, --Prof lie elevations for the North Umpqua River. Winchester Dam to dleyld Park--Continued Cross section Distance upstream from Winchester Dam (in feet) December 1964 flood 1/ Thalweg, low point in channel. 2/ Section not shown on orthophoto map. 3/ Section revised for step-backwater computation. Elevation. in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thaiweg- 1, , , , , , , , , , & , , Private footbridge 135, , , , , D , , , , , , , ,3 746, , ,

34 Table 7. --Revised profile elevations for the South Utnpua River Station Report Map reference referencell Distance upstream from mouth (feet) 1-year fled (adjigsted)a' December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thalweg , , , , , , , , , , , ,55 4l2 3/ , , J , , , , , , / , / , / , , j Conn Ford Bride 25, , / , / , / , / , / , / / , / , / , / , / , / , / , / , / , / , / , / , / , / , / , / , / , / : , / , / , / , / / , / , / , / , / Deer Creek -- 58, , / , / , / Footnotes at end of table. 29

35 Table 7.--Revised profile elevations for the South Umpqua River--Continued Report reference Station Map reference-1/ Footnotes at end of table. Distance upstream from mouth (feet) 1-year flood (adjusted)a' December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thalweg , /451, , / , / , j , / , / , / , /457_ , / , / , / , j , / , / , / , / , / , , / Highway -S bridge 81, , / , / , / , / , / , / , / , / , / , / , / , / , / , / ' 97, / , / , / , / , / , / , / , / , / , / / / /494, 3/ , , / / / /495. 3/ Gaging station 312 and Highway 99 bridge 19, , / /5.4 3/ / / ll , /5. 3/5.9 3/ /498. 3/ , /5.5 3/51.4 3/5.4 3/ , /51. 3/51.9 3/5.9 3/ , /51.8 3/52.8 3/51.8 3/ , /52.6 3/53.5 3/ , /53.4 3/54.4 3/ , /54.3 3/55.2 3/ , /55.4 3/56.4 3/ , /56.8 3/57.8 3/ , /58. 3/ , /59.2 3/ , /51.1 3/ , / / , / / , / / , / / , /s14.9 3/ , / / / / / , / / / /516. 3/

36 Report reference Station Nap referenceji Footnotes at end of table. Table 7.--Revised profile elevations for the South Umpgua River--Continued Distance - stream from muth (feet) 1-yeas flood (adiusted)v December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thaiwee [ , / / / / / [ , / / / /517. 3/ Lookingglass Creek 13, , j5192 3/52. /5l9. 3/517.7 /5l , /52. 3/521. 3/ / / , /52.6 3/ /52.5 3/ / , / / / / / , /522 3/523. 3/ /52.4 j5l , / , j , / , / , / , /531, , / , / , / , / , / , / , / , / , / , / / , / , / , / , / , / , / , / , / , / , / , / , / , , / Nary Moore Bridge 165, , / , / , / , / , / , / , / , / , / , / , / , / , / , / , / , / L86, / , / , / , / , / , / , / , /594, , / , /

37 Report reference Station Map referencej Table 7.--Revised proeile e1.evatiois for the South thupqua River --Continued Distance upstream from mouth (feet) 1-year flood (adjusted)j December 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year 1-year flood flood flood flood Low water Thaiweg , / , / , / , / , / , / Myrtle Creek 23, , / , / , / , / , / , / , / , , / , / , / , / , / ? , / , / , / , / , / , / , / , , , Pruner Bridge 23, , , , , , , , , , , , , , , , Cow Creek 245, , , , , , , , , , , , , : , , , , , , , Canyon Creek 266, , , , Footnotes at end of table. 32

38 Table 7. --Revised profile elevations for the South Umpqua River--Continued Report reference Station Map referencel' Distance - stream from mouth (feet) loo-year flood (adjusted)l/ December 1964 flood Elevation 5-year flood in feet above mean sea level 1-year flood 25-year flood 1-year flood Low water Thalweg , , , , , , , , , , , , , / dentification number on photogrammetric slap. 2/ Adjusted for storage in proposed Days Creek Lake. 3/ Profile revised April

39 Table 8.--Revised profile elevations for the North Jmpqua River. mouth to Winchester DaisY Station Cross Map section referenceí Distance upstream from mouth (feet> Dec ember 1964 flood Elevation, in feet above mean sea level 5-year 1-year 25-year [-year flood flood flood flood Low water ThalwegV , , , , , , , Caging statio,n , '9, , Brown's Bridge -- 9, , , , , , , , , , , , , , , Sutherlin Creek -- 24, , , , , , , , , , Southern Pacific Railroad bridge -- 35,25 Highway 1-5 bridge 35,6 Highway 99 bridge 35, , Winchester Dam 36,46 1/ Supersedes table 8 in Part 1, 1972, because of new frequency analysis. 2/ dentification number on photograimsetric map. 3/ Thalweg, low point in channel. 34

40 SCOTTS8URG W Cnek /A \ // /W. Thweg EXPLAN4 TON 3r95 r Go2in stoflon - 5-year flood - 1-year flood 964 flood - 25-year flood o -year flood - Low wafer omrted Cross sections End ot profile Shown 21 SCALE, N FEET eo: pc 2, 4, 6, 2 4 STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE Profi es of Umpqua R ver

41 \ Creed *ornee/y &eek year flood 1-year flood 964 flood 25-year flood -year flood Low water TOolweg EXPLANATON Cross scfons w--o End of Erolile shown,2? SCALE, N FtET 28, 3, 32, 34, DSTANCE UPSTREAM FROM SCOTTSBURG BRDGE, N FEET 8, 2, 22, FGURE 8.- -Profiles of Umpqua River

42 6 ar" -r - rr' r year flood 1-year flood flood 25-year flood -year flood Low water Thoiweg EXPLA NATON W Cross sectons o..o rrd o profile SFrOwfl CDO SCALE N FEET 2?O 2 34, 36,.ø 38, 4, 42, 48, 5, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE Prof ii es of Umpqua R ver

43 5-year flood year flood 19S4 flood year flood -year flood Loo water Thalweg E)PLANATtN Cross Oecti5 a--o End of profle sf.own 2 SCALE, N FEET 1 -J LU > uj -J (jj LU LU LU H 6 LU LU U- z z > LU 4 -J LU T /. _ , 54, 56, D ANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE -- Profi es of Ump qua R ver 64, - 66, 68,

44 5Oyeor flood ynor flood flood poOr flood -year flood Low wolor Tfloweç EXPLANATON Cross saclons o---o End of profle shown 2 1 SCALE, N FEET = i 649, _ _- - 78,, 82, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE L ii --Prof es of Umpqua R ver 84, 68, 7, 72,

45 1 S yeor flood year flood 964 flood year flood lo-yror flood Lao odler Trlarq EXPLANATON Cross sections e--o End of profile shown Go SCALE,!N FEET 2f 6 86, 88, 9, 92, 94, 96, 98,, 2, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE Profiles of Umpqua River

46 ELKTO _UOQ - -J w > uj -J (/) z w w ad - uj -u LL z z D 8,, 2, / lance UPSTREAM FROM SCOTTSBURG BR DOE, N FEET F GURE Profiles of Umpqua River

47 o 2 _._._._._._._._._.---L:: year foo year flood -year flood o EXPLAUAflON 5 -yeaf flood flood 2i Onos sec?lons -_ End of profile shown - -? co - 2?O SCALE, N FEET 6 U 4, 24, 26, 28, 3, 2, 22, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE Profiles of Umpquc River

48 5-year flood -year flood 964 flood 25-year flood 1-year flood Low water Thalweg EXPLANATON Cross sections 4 it , 136, 138, 4, 42, 44, 146, 6, 3, 132, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE 15--Profiles of Umpquo River

49 14 12 EXPLANATON 5-year flood 395 Gaging station 1-year flood 964 flood (_) Cross sections 25-year flood n--n End of profile shown -year hood Low water Thaiweg 58, 6 DSTANCE FROM SCOTTSBURG BRDGE, N FEET F rofiles of Umpquo River

50 1$ Cree* EXPLANATON 5-year flood year flood Cross sections 1964 flood year flood End of pmale slsown JO-year flood Low water 1(? 29) Thaweg SCALE, N FEET , 172, 74, 76, 178, 1 64, 66, 68, DSTANCE UPSTREAM FR OM SCOTTSBURG BRDGE N FEET FGURE 7--Profies of Umpqua Rver

51 5-year flood year flood 964 flood year flood -year flood Low water Tha?we EXPLANATON o.o En4 of Croos sectoes oflle shows SCALE, N FEET 82, 84, 86, 88, 9, 92, 94, 96, 98, D STANCE UPSTREAM FROM SCOTTS BURG BR DGE, N FEET F GURE i a- - profiles of Umpqua River

52 5year flood year flood 964 flood year flood lycar flood LOW wafer Toweç EXPLANATfON C,oss sccfior,s o----o fled of profle sf,own 2? SCALE, N FEET C C 4 'V 24, 26, 28, 2, / DSTANCE UPSTREAM FROM SCOTTSBURG BR OGE, N FEET FGURE 9--Profies of Umpqua Rver 2 98, 2, 22,

53 / 22 Ke4og Brld,e 5-year. flood -year flood 964 flood 25-year flood -year flood Low water Thalweg EXPLANATON Cross seclions --o End of profile r?ow 9 KOj2O?O SCALE, N FEET n 6 - 'ii 222,c5 224, 226, 228, 23, 232, 4 218, DSTANCE UPSTREAMFROM SCOTTSBURG BRDGE, N FEET 22, FGURE 2Q--Profies of Umpquo Rver 216,

54 J w J w (1) z 22! *! w 2 - EXPLANATON L.L... 5-year flood z 1-year flood () Cross sections flood 25-year flood ---o End 1 profle shown Z -U 232, 234, 236, , 248, Q 1-year ood Low water Thaiweg uj w COO 29) SCALE, N FEET 238, 24, 242, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET F GURE Profi es of Umpqua R ver

55 24 EXPLA CO-year flood loo-yeor flood 1964 flood 25-year flood 1-year flood Low water Thalweg Crosc sector$ o.o End & profile f1own 2 5(A E, N FEET , 252, 254, 256, 258, 26, 262, 264, 266, DSTANCE UPSTREAM FROM SCOTTSBURG BRDGE, N FEET F GURE 22 - Profiles of Umpqua River

56 Lit Cw'yr! Boliw Br EXPLANATON V.'. k 5_year flood year flood 1964 flood yeor flood -year flood Low wotr Cross ec,orrs o.o End of profile shown COO 29) - Tholweg SCALE, N FEET 26 -J Lu > -u -J Ui 1 z LU 24 Ui F- 22 Ui U U- z z ii27.: 274, 276, 272, 278, 2, 282, 1 266, 268, DSTANCE UPSTREAM FROM S COTTSBURG BRDGE, N FEET FGURE 23--Profes of Umpqua Rve r

57 Lost Ce'eefr EXPLANATON u-i J u-i ci) z 4 uj 26 iluwi r.year flood - - -year flood %4 flood year flood 1-year flood Low woler TEolereS Cross sections o--o End of profile Spawn logo SCALE, 1 FEET 2?O u-i 24 > 4 w u-i U- z 22 z > U-i uj U. 2 29, 292, 294, 296, DSTANCE UPSTRE4M FROM SCOTTSBURG BRDGE, N FEET 284, 286, 288, OOC FlGURE 24--Profiles of Umpqua River 298, 3,

58 Crass sect ens?5iif -J Lii -J Lii ci) z Lii > Lii Lii U- z 24 z > w -J UJ 4 L _ o , 34, 36, 312, DSTANCE UPST MOTTG FGURE 25-- Profiles of Umpqua Rive BR DGE, N FEET 316,

59 5OOyeor fo OO-yer fiood 964 lood yeor flood O-eo flood Low water Thaiweg EXPLAN#TON Cross sections w----o End of prothe shown 2? SCALE, N FEET -J LJJ > uj -J 4 LU (-) (J Z uj > 4 F- LU LU U- z z > LU -J LU, 326, 328, 332, 334, D STANCE UPSTREAM FROM SCOTTSBURG BR DGE, N FEET 3 8, 32, 322, OOC F GURE 26 - Profiles of Ump qua River

60 5-year flood OU-year flood 954 flood year flood 1-year flood Low eater Tholweg EXPLANATON Cross SOCti o End of pfoti!e shown )Oi2O?o SCALE, N FEET -J LU > LU -J LU Cr) ()Z LU LU > - LU LU CL z z > LU -J LU zco ,O , 34, 342, 344, 346, 348, 35, 352, DSTANCE UPSTREAM FROM SCOTTSBURG BRDGE, N FEET F GURE 27-- Profi es of Ump qua R ver

61 \W )1MM 4 jf Qo yeq' flqq EEEL C' 'in:e -J tjj >w -J UJ // _ i', / STANCE UPSTREAM FROM SCOTTSBURG BRDGE, N FEET 354, 356, , \ 368, 37, 372, F GURE 28--Prof es of Umpquo R ver

62 WNC-4ESTER 49- E X FL AN ATf ON year f rood too_yeor ffsoo g64 1d year Food CO-year Food :U Cross sectoos a.o End of profile Shown logo SCALE N FEET 2p -- / , t 2, 4, 16P DSTANCE UPSTREAM FROM WNCHESTER DAM, N FEET F GURE Profiles of North Umpqua River

63 /cl 5OO-yer tooo OOyeor flood flood year flood -year flood Low wofer Tfawe EXPLANATON Cross oector's -o End of OrofiJ shown 1) 2?O SCALE, N FEET 52 ' P".. 8, 'W' 22, 24, DSTANCE UPSTREAM FROM WNCHESTER DAM, N FEET F GURE 3--Profiles of North Umpqua River

64 5-year ftaod year flood 964 tood year flood -year flood Low water Ttrotweq EXPLANATON Cross sectows Erd of Deoie showrr 9 SCALE N EEET 1 34, 36, 4, 42, 44 46, 48 5 DSTANCE UPSTREAM FROM F GURE Profiles of WNCHESTER DAM, N FEET North Umpqua River

65 ' 1964 and year flood combined -J w 5 -J uj () w LU 56 > uj uj LL z z - 54C > tj -J LU 54, 52, 56, 58, 6, 62, 64, D STANCE FROM WNCHESTER DAM, N FEET UPSTREAM Fl rofiles of North Umpqua River yrfd shown 1 2 SCALE, N FEET 66,

66 -J ii -J uj U) z LU > - Ui Ui Ui z > LU -J UJ :... _ppp CC-year flood 1l_yeoe flood 'L1964 flood year flood -year flood Low water Teal WC9 - ' 11 EXPLANATON Cross sections o. - End of profile shown po12o SCA, N FEET i 7, 72, 82, 84, 74, 76, 78,, 68, DSTANCE UPSTREAM FROM WNCHESTER DAM, N FEET F GURE 33 - Profiles of North Umpqua River

67 S o - o -J -J uj cr z uj 66 j 64 > - w LiJ Li z z 62 (d 25_yecr flood loyeor flood Low Cross sections o.---o End of profile stown SCALE, nj FEET T-.-;:: T T T _ : p 88, 9, 94, 96, 98,, 2, CX A 86, DSTANCE FROM WNCHESTER DAM, N FEET FGURE 34--P rofiles of North Umpqua River

68 -- -J LU > LU -J LU LU LU > LU. U- z z -J LU C eo flood year Low 4 Cross flood n--o End of profile shown l-yeor flood oo?er 1 2 Tholweg SCALE, N FEET... OU 4 auu 1; --,' A 8,, 2, 16, 114, 116, 118, D STANCE UPSTREAM FROM WNCHESTER DAM, N FEET FGURE 35- -Profiles of North Umpqua River

69 LU _J 5-year flood 1-lO-year flood \1964 flood year flood 1-year flood Low water Tholweg EXPLANAT ON () Cross secf ons 2OO SCALE, S4 FEET LU c-n z LJ Lii 7 - LU LU U- z - 68C z > LU J LU 2, 22 24, 26,(X) 28, 3, 32, 3 36, DSTANCE UPSTREAM FROM WNCHESTER DAM, N FEET F GURE, 36 - Profiles of North Umpqua River

70 -J LJ > uj -J 76 EXPLANATON 5-yeor flood,-oo-yeor flood 964 flood yecr flood Cross secors o.o End of profile Shw Thwe SCALEJN FEET 2 uj w uj > 74 F- 72 uj uj U- z -J Ui AR -- 32, 136, 4 A -- 38, 4, 42 '4' DSTANCE UPSTREAM FROM WNCHESTER DAM, N FEET F GURE 37--Profiles of North Umpqua River 44,

71 Left bank R.gh? bank 9Left bank Rgb OOnb CROSS SECTON 42CROSS SECTON 2 CROSS SECTON n U Li 44 42CROSS SECTON 42CROSS SECTON 5 42 CROSS SECTON a -7 r / U 411 ( Oo SECTON SECTON 8 42CROSs SECTON \ ROSS SECTON 1 CROSS SECTON CROSS SECTON U C' U 46 8 EXPLANATON 5-year flood 1-year f load flood 25-year flood 1-year flood Low wafer 4 2CROSS SECTON 13 U CROSS SECTON H HORZONTAL SCALE, N FEET FGURE 38--North Umpqua River cross-sections 66

72 Left Right bard 5 52 Left bank Right bonk Left bark 52 Right bank CROSS SECTON 15 CROSS SECTON U 5 ci ii CROSS SECTON 17 6 J w > uj _J w (_) w uj m w z z 44 CROSS SECTON 19 4CROSS SECTON 19 CROSS SECTON CROSS SECTON 21 CROSS SECTON 22 6CROSS SECTON uj CROSS SECTON 26 CROSS SECTON 24 4 SECTON EXPLANATON 5-year flood year flood 1964 flood 25-year flood 1-year flood Low water SECTON CROSS SECTON 28 HORZONTAL SCALE, N FEET 6 FGURE 39--North Umpqua River cross-sections 67

73 54Lgtt bank Right bank Let honk 54 Right bank Left bank 54 Right bank CROSS SECTON CROSS SECTON 31 46CROSS SECTON U CROSS SECTON 32 CROSS SECTON CROSS SECTON CRQS SECTON 35 CROSS SECTON 36 CROSS SECTON , CROSS SECTON 38 CROSS SECTON 39 5CROSS SECTON U \ \ EXPLANATON 5-year flood 1-year flood 1964 flood 25year flood 1-year flood Low water O CROSS SECTON 41 CROSS SECTON 42 HORZONTAL SCALE, N FEET FGURE 4--North Umpqua River cross-sections 68

74 5 Fghl bcetk Left brnk 5 Rfçht bank CROSS SECTON 43 5CROSS SECTON / 2 CROSS SECTON 46 -J LU > LU z uj LU 5CR5S SECTON CRQSS SECTON 4? U CROSS SECTON 49 z z C CROSS SECTON 5 / 5 CROSS SECTON / El 52 U CROSS SECTON year EXPLANATON 5-year flood -year flood 1964 flood flood 1-year flood Low water 9 CROSS SECTON 52 HORZONTAL SCALE N FEET FGURE 41 --North Umpqua River cross-sections 69

75 3LOfl biik yr / Rçh! nk Let? ban CROSS SECTON 5'! --- Rht bank 52CROSS SECTON / CROSS SECTON 55 CROSS SECTON 56 CROSS SECTON 5? Combined with yew 6 Combined with year Hood 6 Cc,nOrod wdh flood CROSS SECTON 58 CROSS SECTON 59 54CROSS SECTON Cornbned wh 1 yecr hood. Ccnnbl,ed wh yo ticod, Ccarflodd 6 C a CROSS SECTON 61 CROSS SECTON CROSS SECTON '! Coiddnd wdh ye thood 64 C GO EXPLANATON 5-year flood year flood flood 25-year flood 1-year flood Low water CROSS SECTON 64 6CRUSS SECTON 85 6 HORZONTOL SCALE, N FEET FGURE 42--North Umpqua River cross-sections 7

76 64Left bank Rgh1 bik 64 Left bank Right bank bai Right bank CROSS SECTON CROSS SECTON 6? 6CROSS SECTON CROSS SECTON 69 CROSS SECTON 7 CROSS SECTON 71 / CROSS SECTON 73 CROSS SECTON tt 5 6CROSS SECTON GO 6 CO 6 5CROSS SECT ON 75 CROSS SECTON 76 CROSS SECTON 77 6 EXPLANATON 5-year flood _[ -year flood flood 25-year flood 1-year flood Low water 6c 5CROSS SECTON 18 6'CROSS SECTON 19 HORZONTAL SCALE, N FEET FGURE 43--North Umpqua River cross-sections

77 6Left bak Rigbi boith 6Left bor Rçh bank bank RNht bcab ' 6 6q CR9S SECTON 6CROSS SECTON 81 6CROSS SECTON CROSS SECTON 83 CROSS SECTON 84 6' CROSS SECTON 85 6 Ui Lii CROSS SECTON 86 SECTON 87 z 2 J EXPLANATON 5-year flood roo-year flood 1964 flood 25-year flood 1-year flood Low water 62 6 CROSS SECTON 88 HORZONTAL SCALE. N FEET C ( CROSS SECTON 89 FGURE 44--North Umpquu River cross-sections 72

78 Lf bon 7 Right banh ; CROSS SECTON CROSS SECTON H- 6 4 Th. 62 CROSS SECTON 92 TOO CROSS SECTON CROSS SECTON 94 EXPLANATON 5-year flood _[ 1-yew flood flood 25-year flood 1-year flood Low water HORZONTAL SCALE, Fr FGURE 45--North Umpqua River cross-sections 73

79 Left bark 7 Ri.ht bank 1Left bor* 7 Rht ba,,k CROSS SECTON CROSS SECTON a a 68a S CROSS SECTON CROSS SECT ton r CROSS SECTON a 7 J CROSS SECTON CROSS SECTON 11 / / EXPLANATON 5-year flood [1-year flood l 964 flood 25-year flood 1-year flood Low water SC 9 HORZONTAL SCALE, N FEET FiGURE 46-- North Umpquo River cross-sections 74

80 )Left bark Right bk 7 Left txrnk Rht book CROSS SECTON CROSS SECTON GO CROSS SECTON 64 loll 7 62CROSS SECTON 15 6CROSS SECTON 16 Ll GO CRQSS SECTON 1? CROSS SECTON GO GE EXPLA4ATON 5-year flood - f 1-year flood 1964 flood 25-year flood Low water 16 HORZONTAL SCALE, N FEET 84 CROSS SECTON 19 FGURE 47--North Umpqua River cross-sections 75

81 74 Left bunk Right bunk Left bunk 74 RlQht bank CROSS SECTON 6CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON 115 EXPLANATON 5-year flood [ -year flood l 1964 flood 25-year flood 1-year flood Low water 6 HORZONTAL SCALE, N FEET FGURE 18-- North Umpqua River cross-sections 76

82 Left bank Right bank Left bunk Rçh bank CROSS SECTON CROSS SECTON CROSS SECTON 118 CROSS SECTON Lf 7'; 72 7' CROSS SECTtJN CROSS SECTON '; CROSS SECTON 122 6CROSS SECTON CROSS SECTON U , 7 2 EXPLANATON 5-year flood roo-yr flood i 964 flood 25-year flood 1-year flood Low water i 81 l6o CROSS SECTON 125 CROSS SECTON 126 HORZONTAL 5GALE N FEET FGURE 49--North Urnpqua River cross-sections 77

83 76LMft bw* bght bx* bank Right bank LO bank Rtght bik / CROSS SECTON CRSS SECTON CROSS SECTON J CROSS SECTON 13 CROSS SECTON 131 6CROSS SECTON L CROSS SECTON 133 6CRS5 SECTON CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON EXPLANJVflON 5-year fcc _f 1-year flcd 4 L 964 flood 25-year floed O-yecr lcod La,e:er 6 16C3 7 CROSS SECTON cRZONTAL SCALE, N FEET FGURE 5--North Umpqua River cross-sections 78

84 Left bach Right bank Left bank Right back 6 61) 6 Lnft bank Right borh CROSS SECTON CROSS SECTON 2 CROSS SECTON 6 6 so ' -2 CROSS SECTON CROSS SECTON 2 CROSS SECTON CROSS SECTON 2 a CROSS SECTON 8 - CROSS SECTON 9 6 L / CROSS SECTON 12 / -2 2CROSS SECTON 11 EXPLANATON - CROSS SECTON 1 5-year flood 1-year flood 1964 flood 25-year flood -year flood Low wafer FGURE Umpqua River cross-sections 9 HORZONTAL SCALE N FEET

85 Left beak tght bock Left bonk Ri8ht bank to 2 2 CROSS SECTON 14 2 CROSS SECTON / CROSS SECTON 15 U CROSS SECTN / CROSS SECTON 17 CROSS SECTON EXPLANATON 5-year flood -year flood flood 25-year flood -year flood Low water 6 -RtZONTAL SCALE, N FEET CROSS SECTON 19 2 CROSS SECTON 2 FGURE 2 -- Jmpquo River cross-sections so

86 Rq1i bonk Left bank Aght bank Left bank Rght bank 'to CROSS SECTON 21 2CROSS SECTON 22-2 CROSS SECTON ' Ni7 2 CROSS SECTON A 7T CROSS SECTON 25 -J ( CROSS SECTON 26 \ L 7-J CROSS SECTON 2? CROSS SECTON 28 CROSS SECTON ' CROSS SECTON 3 CROSS SECTON 31 EXPLANATON 5-year flood -year flood 1964 flood 25-year flood year flood Low water HORZONTAL SCALE; FEET 6 FGURE LJrnpqia River cross-sections 81

87 1 Left bck Right bank 1af1 berth 1 Right boric 'to 2 2 CROSS SECTON 32 CROSS SECTON J 4 4 Ui..j 2 2 CROSS SECTON 34 CROSS SECTON 35 Ui Ui > z y U_ CROSS SECTON 36, CROSS SECTON EXPLANATON 5-year flood 1-year flood flood 25-year flood 1-year flood Low water 2 6 HORZONTAL SCALE, N FEET CROSS SECTON 38 FGURE 54 --Umpquo River cross-secs 82

88 Left bank Right bank Left ba'j 1 1 Ri?ht bank L CROSS SECTON 39 CROSS SECTON 4 : So 6 6 CROSS SECTON 41 CROSS SECTON 42 CROSS SECTON '1 'to CROSS SECTON 46 CROSS SECTON 44 CROSS SECTON EXPLANATON 5-year flood -year flood flood 25-year flood -year flood Low water HORZONTAL SCALE, N FEET 2 CROSS SECTON 4;7 FGURE 55-- Umpqua River cross-sections

89 ! Lft bark Rr.h bank Left bank Fght ban 1 1 iiii-- 6 _ CROSS '-V 2 2 SECTON '48 CROSS SECTON 49 CROSS SECTON 5 1 \ -: '1 * '4 2' 2 CROSS SECTON 51 CROSS SECTON 52 2 CROSS SECTON 53 LU -J LU z LU LU - z z V 2 CROSS SECTON 54 2 CROSS SECTON 55 2 CROSS SECTON '4 ( 2 CROSS SECTON 5? 2 CROSS SECTON 58 EXPLANATON 5-year flood 1-year flood 1964 flood 25-year flood -year flood Low wafer HORZONTAL SCALE N FEET 16(? FGURE 56-- Umpqua River cross-sections 84

90 2LEf! bonk 1 12 Left bank Ribt bank CROSS SECTON 59 CROSS SECTON CROSS SECTON 61 2 CROSS SECTON 62 CROSS SECTON U CROSS SECTON 65 CROSS SECTON 66 2 CROSS SECTON L r 6 4 ) 12 / / 1 / EXPLANATON 6 / " 5-year flood -year flood 964 flood 25-year flood -year flood Low wafer 6 CROSS SECTON 6? CROSS 'SECTON 68 HORZONTAL SCALE, N FEET FGURE 57 --Umpqua River cross-sections 85

91 12 Left hank Right hank bqr CROSS SECTON 69 CROSS SECTON 7 4 CROSS SECTON CROSS SECTON 72 CROSS SECTON 73 4 CROSS SECTON : CROSS SECTON 75 4 CROSS SECTON / r 6 4" CROSS SECTON 77 EXPLANATON 5-year flood 1-year flood flood 25-year flood year flood Law water 6 HORZONTAL SCALE, N FEET FGURE 58.--Umpqua River CrOSS-SeCtiOnS 86

92 14 Left bk Right bon CROSS SECTON CROSS SECTON C 6 U CROSS SECTON 14 5-year flood 12 1-year flood 1964 flood 25-year flood 1 1-year flood Low wafer / EXPLANATON 6 6 HORZONTAL SCALE, N FEET CROSS SECTON 81 FiGURE 59-- Umpquo River cross-sections 87

93 14Left bank 12 1 Rht bck EXPLANATON 5-year flood 1-year flood flood! 25-year flood 1-year flood Low wafer 6 HDRZNTAL SCALE, N FEET EQ 4 CROSS SECTON J ij 6 6 z 4' CROSS SECTON 83 w CROSS SECTON 84 / - 6 N 6 4 CROSS SECTON 85 4 CROSS SECTON / 12 1' 1 J CROSS SECTON 8? 1 CROSS SECTON 88 FGURE 6 --Umpquo River cross-seclions 88

94 Left bgnk R bank Left bank Rjh bank 12 2 ' CROSS SECTON 89 '1 CROSS SECTON CROSS SECTON 92 4 CROSS SECTON ' CROSS SECTON CROSS SECTON 95 4 CROSS SECTON 94 i;o 12 1 CROSS SECTON 96 EXPLANATON 5-year flood year flood flood 25-year flood year flood Low water O HORZONTAL SCALE, N FEET FGURE 6 -- Umpqua River cross-sections 89

95 Left bank Rqht bonk 14 Left bank Right kank CROSS SECTON 9? 6 CROSS SECTON 98 plo 12 \ / CROSS SECTON CROSS SECTON 1 6 CROSS SECTON U 6 4 CROSS SECTON 12 CROSS SECTON 13 EXPLANATON 5-year flood 1-year flood 1964 flood 25-year flood 1-year flood Low wafer 8j)O 19 HORZONTAL SCALE, N FEET FGURE 62-- Umpqua River cross-sections 9

96 14Lett bank Rh txa$c 12 1 \ go CROSS SECTON 15 4 CROSS SECTON io# / 12 1 CROSS SECTON CROSS SECTON CROSS SECTON 18 EXPLANATON 5-year flood 1-year flood 1964 flood 25-year flood 1-year flood Low water 6(X) HORZONTAL SCALE, N FFET FGURE 63 --Lpqua River cross-sections 91

97 Left bank / Rigflt bank EXPLANATON 5-year flood -. 1-year flood flood year flood -year flood Low wafer C 6 CROSS SECTON 19 HORZONTAL SCALE, FEET J wj uj 1 6' CROSS SECTON 11 6 CROSS SECTON 111 uj ' CROSS SECTON 112 CROSS SECTON CROSS SECTON 114 \J CROSS SECTON 115 / FGURE 64-- Umpqua River cross-sections 92

98 1.aU bank Rgh bank 16 Left bank 16 Rnht bank C CROSS SECTON 117 CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON 121 EXPLANATON 5-year flood -year flood 964 flood 25-year flood -year flood Low wafer HORZONTAL SCALE N FEET 16 FGURE 65 --Umpqua River cross-sections 93

99 16Lpft bon Rihl bonk CROSS SECTON CROSS SECTON 123 z 4 - LiJ 12 Ui 1 - U- 1 V \ z. 6' CROSS SECTON Ui CROSS SECTON EXPLANATON 5-year flood 1-year flood 1964 flood 25-year flood 1-year flood Low water CROSS SECTON 126 HORZONTAL SCALE, N FEET FGURE 66 --U'npqua River cross-sections 94

100 16Left bank Rjh rk Left bunk 6 Rkght bunk HO U 1 1 CROSS SECTON CROSS SECTON CROSS SECTON 12$ CROSS SECTON CROSS SECTON U _ 2 - Ti 16 CROSS SECTON CROSS SECTON 133 EXPLANATON 5-year flood 1-year thod 1964 flood 25-year flood 1-year flood Low wafer HORZONThL SCALE, FJ FEET FGURE 67-- Umpqua River Cross-seCtions 95

101 16Lnft bank Rçh1 bank \ y r 1 'CROSS SECTON 134 CROSS SECTON 135 CROSS SECTON SO ¼., U CROSS SECTON 13? 6 CROSS SECTON 138 CROSS SECTON 139 CROSS SECTON U CROSS SECTON CROSS SECTON 142 CROSS SECTON SD / CROSS SECTON CROSS SECTON 1'S CROSS SECTON 146 EXPLANA11ON 5-year flood 1-year figod 1964 flood 25-year flood -year flood Low water 81? l6o HORZONTAL SCALE, N FEET FGURE 68--Umpquo River cross-sections 96

102 Lnf bank Rgh bank 18 1 Lef bank R,t bank 1 Lnft bank Right bank CROSS 1 U SECTON 147 1CROSS SECTON 148 CROSS SECTON CROSS SECTON CROSS SECTON 151 CROSS SECTON 152 / 18 18& CROSS SECTON CROSS SECTON 154 1CROSS SECTON CROSS SECTON CROSS SECTON EXPLANATON 5-year fk)od 1-year flaod 1964 flood 25-year flood 1-year flood Low water HORZONThL '1Q41 F, N FEET 1 CROSS SECTON 158 CROSS SECTON 159 FGURE 69 --U-npqua River cross-sections 97

103 2 bank Riqht bonk 2 bcbac Rh bank Let bank 22 Raht br,b CROSS SECTON 16 1 CROSS SECTON CROSS SECTON uj _j uj () z Ui '2CROSS SECTON CROSS SECTON UJ > UJ z leo U CROSS SECTON 165 CROSS SECTON 166 CROSS SECTON / / EXPLANATON 5-year flood year flood 1964 flood 25-year flood 1-year flood Low water 12 CROSS SECTON 168 SECTON 169 HORZONTAL SCALE, N FEET FGURE 7-- Umpquo River CrOSS-SeCtiOnS 98

104 La1 bank 2 Ri9hf bank Lef ba,k 2 Left bank 2 R8h bank 'so CROSS SECTON CROSS SECTON 171 SECTON so ill 14 1 ' _J LiJ > uj w Ui SECTON CROSS SECTON CROSS SECTON 175 t -i j H- Ui z 1 2 CROSS SECTON CRS5 SECTON 1?? CROSS SECTON 178 LU CROSS SECTON CROSS SECTON 1 EXPLANATON 5-year flood.- 1-year flood flood 25-year flood 1-year flood Low wafer O HORZONTAL SCALE, N FEET FGURE Umpqua River cross-sections 99

105 9 Lef bank 22 Rnht ba,k LeN bank 2 2 Ri8ht bank jlj 12CROSS SECTON CROSS SECTON SECTON CROSS SECTON CROSS SECTON \ "F CROSS SECTON CROSS SECTON CROSS SECTON TTEE EXPLANATON 5-year flood 1-year flood 1964 flood 25-year flood lu-year flood Low water 14 HORZONTAL SCALE, N FEET 9 12CROSS SECTON 19 FGURE 72 --LJmpqua River cross-sections 1

106 Left bank 22 Rgb bank Lef bank Righ? bark Left bank Right kink CROSS SECTON CROSS SECTON CROSS SECTON a 1'1CROSS SECTON 22 19'l 14 CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON 198 lii CROSS SECTON / 14 CROSS SECTON CROSS SECTON CROSS SECTON 22 EXPLANATON year flood -year flood flood 25-year flood 1-year flood Low wafer 6 HORZONTAL SCALE, N FEET FGURE Umpqua River cross-sections

107 24 Left bank Right bank Left bank 24 Rih bank too 6 16 U 14CROSS SECTON CROSS SECTON U rp w 1 18 _J LU 1 4 CROSS SECTON CROSS SECTON 26 LU > / LU LU U- z z CROSS SECTON 27 CROSS SECTON U -year flood EXPLANATON 5-year flood flood 25-year flood 1-year flood Low water 6 CROSS SECTON HORZONTAL SCALE, N FEET CROSS SECTON 21 FGURE 74 --Umpqua River cross-sections 12

108 Left bon 24 Right honk 24 Lplt bark Right bank CROSS SECTON CROSS SECTON 212 z Lu CROSS SECTON \ 213 / r 7 - // EXPLANATON 5-year flood -year flood flood 25-year flood 1-year flood Low water HORZONTAL SCALE, FEET Lu z 6 CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON 219 FGURE Umpqua River CrOSS-SeCtiOnS 3

109 Left bon1 2' RQht bti¼ Left bank 24 Ri9ht beak Left bank 24 Rbt bank L ' ii CROSS SECTON 22 CROSS SECTON 221. CROSS SECTON CROSS SECTON 223 CROSS SECTON CROSS SCTN ' q ' ' CROSS SECTON 226 6CROSS SECTON 227 ii 16CROSS SECTON ' CROSS SECTON CROSS SECTON CROSS SECTON 231 EXPLANAflON 5Oyeor flood -year flood 1964 flood 25-year flood -year flood Low wafer 6so HORZONTAL SCALE, N FEET FGURE Umpqua River cross-sections 4

110 Left bank Right bank Left bank Rih bank 26Lett bank bah? bank C LU j uj 6 CROSS SECTON T! CROSS SECTON 235 CROSS SECTON 233 1CR9S SECTON CROSS SECTON 236 CROSS SECTON 23? LU LU > Lii JLU CROSS SECTON 238 CROSS SECTON 239 1CRS5 SECTON 'CROSS SECTON CROSS SECTON CROSS SECTON 2143 EXPLANATON 5-year flood -year flood flood 25-year flood 1-year flood Low water HORZONTAL SCALE, N FEET FGURE 77-- Umpqua River cross-sections

111 Lf bcnk 26 R bonk Left bok 26 Rht book 26Left book Rht bk CROSS SECTON 2'14 CROSS SECTON 245 1CROSS SECTON U J CROSS SECTON 24? 2 CROSS SECTON 248 CROSS SECTON 249 Ui -J UJ z bo Ui UJ > CRS5 SECTON 25 CROSS SECTON 251 CROSS SECTON CROSS SECTON CROSS SECTON 254 K 2 EXPLANATON 5-year flood 1-year flood flood 25-year flood -year flood Low water SECTON HORZONTAL SCALE N FEET FGURE 78 --Umpquo River cross-secons 16

112 Left bank 28 Right bank Left bonk RQh bank 2Lett bank 2 Pigkt bank U CROSS SECTON 25? 2CROSS SECTON 258 1CROSS SECTON CROSS SECTON SECTON 26 2 CROSS SECTON U CROSS SECTON CROSS SECTON 263 2CROSS SECTON J CROSS SECTON CROSS SECTON 266 CROSS SECTON 267 EXPLANATON 5-yeor flood OO-yeor flood 1964 flood 25-yeor flood 1-year flood Low water HORZONTAL SCALE N FEET 16 FGURE Umpqua River cross-sections 7

113 Lef bt 3 f49hf btk Left bonk 3 Right bonk CROSS SECTON CROSS 2 SECTON 269 SECTON t J w _j 2 CROSS SECTON CROSS SECTON CROSS SECTON 273 z Lii z > UJ CROSS SECTON CROSS SECTON CROSS SECTON 276 EXPLANATON 5-year flood _._._._._.. -year flood flood 25-year flood.._ year flood Low water HORZONTAL SCALE, N FEET 22CROSS SECTON 2?? SECTON CROSS SECTON CROSS SECTON 2 SECTON 281 FGURE --Umpqua River cross-sections 18

114 3 Right bank Left bank 3 Right bank CROSS SECTON CROSS SECTON / / 'CROSS SECTON 28 22RQSS SECTON 285 -j CROSS SECTON CROSS SECTON CROSS SECTON U \ r J 24CROSS SECTON EXPLANATON 5-year f rood OO-yeor flood 1964 frood 25-year flood -year t rood Low water 6 HORZONTAL SCALE, N FEET 22 CROSS SECTON 29 FGURE Umpquo River Cross-SeCtions 19

115 eft bc%j, 32 Right bank 32Left bank R,ght bark $ CROSS SECTON CROSS SECTON 292 F 2: 2' 1L1 2* CROSS SECTON CROSS SECTON 29? 22 CROSS SECTON rr ' CROSS SECTON CROSS SECTON CROSS SECTON 3 24CROSS SECTON 31 EXPLANATON 5-year flood 1-year flood flood 25-year flood 1-year flood Low water HORZONTAL SCALE, N FEET FGURE 82 --Umpqua River cross-sectcns ho

116 32 L&t bc,nk R,ht bor, 2Lft 3 borc Ritit bonk 3" Lifl bonk Rgbt banb ' CROSS SECTON CROSS SECTON ' CROSS SECTON ' CROSS SECTON 35 28a / SECTON CROSS SECTON J H w CROSS SECTON 38 -z 34 z CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON CROSS SECTON EXPLANATON 5-year flood l-yearflood flood 25-year flood -year flood Low water 6 26 CROSS SECTON CROSS SECTON 315 HORZONTAL SCALE, N FEET FGURE Umpqua River cross-sections

117 34Left bank Hi9ht bank Left bank 34 Right ban Lef bcnk 34 Rgh bank CROSS SECTON CROSS SECTON 31? 34 26CROSS SECTON CROSS SECTON CROSS SECTON 32 2CROSS SECTON ft 28ORQSS SECTON CROSS SECTON 32 4 z 6 3 CROSS SECTON U CROSS SECTON 325 SECTON 32? CROSS SECTON 326 EXPLANATON 5-year flood 1-year flood 1964 flood 25-year flood 1 year flood Low water HRNTAL SCALE, J FEET FGURE 84-- Umpquci River CrOSS-SeCtionS 112

118 barj Right bank Lc1t tr 36 bank CRS5 SECTON CROSS SECTON 33 6 CROSS SECTON J CROSS SECTON 331 2RO55 SECTON 332 2CRO59 SECTON 333 LU H U- z EXPLANATON 5-year flood 1-year flood flood 25-year flood 1-year flood Low water 16 HORZONTAL SCALE, N FEET FGURE 85 --Umpqua River cross-sections 13