VOLUME 2 OF 2 MADISON COUNTY, ILLINOIS AND INCORPORATED AREAS * * * COMMUNITY COMMUNITY NAME NUMBER ALHAMBRA, VILLAGE OF 170270 ALTON, CITY OF 170437 BETHALTO, VILLAGE OF 170438 COLLINSVILLE, CITY OF 170439 EAST ALTON, VILLAGE OF 170440 EDWARDSVILLE, CITY OF 170441 GLEN CARBON, VILLAGE OF 170442 GODFREY, VILLAGE OF 171031 GRANITE CITY, CITY OF 170443 GRANTFORK, VILLAGE OF 170209 HAMEL, VILLAGE OF 170160 HARTFORD, VILLAGE OF 170444 HIGHLAND, CITY OF 170445 LIVINGSTON, VILLAGE OF 170794 MADISON, CITY OF 170446 MADISON COUNTY (UNINCORPORATED AREAS) 170436 MARINE, VILLAGE OF 170199 MARYVILLE, VILLAGE OF 170299 NEW DOUGLAS, VILLAGE OF 170316 PIERRON, VILLAGE OF 170317 PONTOON BEACH, VILLAGE OF 170447 ROXANA, VILLAGE OF 170448 SOUTH ROXANA, VILLAGE OF 170449 ST. JACOB, VILLAGE OF 170208 TROY, CITY OF 170255 VENICE, CITY OF 170450 WILLIAMSON, VILLAGE OF 170324 WOOD RIVER, CITY OF 170451 WORDEN, VILLAGE OF 170825 Madison County PRELIMINARY *NO SPECIAL FLOOD HAZARD AREAS IDENTIFIED Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 17119CV002A
NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program (NFIP) have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) report may not contain all data available within the Community Map Repository. It is advisable to contact the Community Map Repository for any additional data. The Federal Emergency Management Agency (FEMA) may revise and republish part or all of this FIS at any time. In addition, FEMA may revise part of this FIS report by the Letter of Map Revision (LOMR) process, which does not involve republication or redistribution of the FIS report. Therefore, users should consult with community officials and check the Community Map Repository to obtain the most current FIS report components. Selected Flood Insurance Rate Map panels for this community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross sections). In addition, former flood hazard zone designations have been changed as follows: Old Zones New Zone A1 through A30 AE B X C X Initial Countywide FIS Effective Date: This preliminary FIS report does not include unrevised Floodway Data tables or unrevised Flood Profiles. These Floodway Data tables and Flood Profiles will appear in the final FIS report.
TABLES OF CONTENTS Table of Contents Volume 1 Page 1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgements 1 1.3 Coordination 4 2.0 AREA STUDIED 5 2.1 Scope of Study 5 2.2 Community Description 9 2.3 Principal Flood Problems 10 2.4 Flood Protection Measures 13 3.0 ENGINEERING METHODS 16 3.1 Hydrologic Analyses 17 3.2 Hydraulic Analyses 23 3.3 Vertical Datum 26 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 29 4.1 Floodplain Boundaries 29 4.2 Floodways 31 5.0 INSURANCE APPLICATION 75 5.1 Flood Insurance Zones 75 6.0 FLOOD INSURANCE RATE MAP 76 7.0 OTHER STUDIES 76 8.0 LOCATION OF DATA 79 9.0 BIBLIOGRAPHY AND REFERENCES 79 FIGURES FIGURE 1 Floodway Schematic 31 i
Table of Contents Volume 1 (continued) Page TABLES TABLE 1 Madison County CCO Meetings 5 TABLE 2 Limits of Previously Detailed Studies 5 TABLE 3 Limits of New Detailed Studies 7 TABLE 4 Letters of Map Change 9 TABLE 5 Peak Discharge Values 19 TABLE 6 Manning s n Values 24 TABLE 7 Summary of Still Water Elevations 25 TABLE 8 Datum Conversion Calculations by Stream 26 TABLE 9 Mississippi River Vertical Datum Conversions 27 TABLE 10 Floodway Data Tables 34-74 TABLE 11 Community Map History 77-78 Table of Contents Volume 2 EXHIBITS Exhibit 1 Flood Profiles Belt Line Creek Cahokia Creek Canteen Creek Coal Branch Creek East Alton Ditch East Fork Silver Creek East Fork Wood River Honeycut Branch Indian Creek Joulters Creek Judys Branch Judys Branch Tributary 5 Judys Branch Tributary 5A Judys Branch Tributary 5B Judys Branch Tributary 9 Judys Branch Tributary 9A Judys Branch Tributary 9B Judys Branch Tributary 10 Judys Creek Judys Creek Tributary B Laurel Branch Laurel Branch Tributary 1 Lindenthal Creek Lindenthal Creek Tributary 1 Lindenthal Creek Tributary 2 Lindenthal Creek Tributary 3 Lindenthal Creek Tributary 4 Mississippi River Mooney Creek Mooney Creek Tributary 1 Panels 01P 02P 09P 10P 12P 13P 14P 15P 16P 17P 18P 20P 21P 22P 24P 25P 27P 28P 32P 33P 34P 35P 36P 37P 38P 39P 40P 41P 43P 44P 45P 46P 47P 48P 50P 51P 52P 53P 54P 55P 57P 58P 61P 62P ii
Table of Contents Volume 2 (continued) EXHIBITS (continued) Exhibit 1 Flood Profiles (continued) Mooney Creek Tributary 2 Paddock Creek Sherry Creek East Fork Sherry Creek Silver Creek Silver Creek Tributary No. 1 Silver Creek Tributary No. 2 Smith Lake Tributary Smith Lake Tributary 2 Stanley Creek Sugar Fork Tributary E Tributary F Tributary G Tributary X Tributary Z West Fork Wood River Wood River Panels 63P 64P 66P 67P 68P 69P 70P 71P 72P 73P 74P 75P 76P 77P 78P 79P 80P 81P 82P 84P 85P Exhibit 2 PUBLISHED SEPARATELY Flood Insurance Rate Map Index Flood Insurance Rate Maps iii
480 480 470 460 LIMIT OF DETAILED STUDY US BUSINESS ROUTE 40 FARM ROAD CORPORATE LIMITS CORPORATE LIMITS CORPORATE LIMITS RAILROAD LAKESIDE DRIVE 470 460 450 450 ELEVATION IN FEET (NAVD) 440 430 420 STATE ROUTE 157 10%, 2%, 1% AND 0.2% COINCIDE IN THIS REGION 440 430 420 410 410 0.2% ANNUAL CHANCE FLOOD 400 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 390 8000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 34,000 STREAM DISTANCE IN FEET ABOVE MOUTH 10P
530 530 520 510 ST. CLAIR COUNTY BOUNDARY MADISON COUNTY CLINTON STREET MILL STREET MULBERRY ROAD CITY OF COLLINSVILLE MADISON COUNTY COUNTY ROAD ROLEK ROAD RAILROAD LEBANON ROAD CITY OF COLLINSVILLE CORPORATE LIMITS CITY OF COLLINSVILLE CORPORATE LIMITS 520 510 500 500 ELEVATION IN FEET (NAVD) 490 480 470 490 480 470 460 460 0.2% ANNUAL CHANCE FLOOD 450 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 440 CROSS SECTION LOCATION 34,000 36,000 38,000 40,000 42,000 44,000 46,000 48,000 50,000 52,000 54,000 56,000 STREAM DISTANCE IN FEET ABOVE MOUTH 11P
560 560 550 540 TROY ROAD INTERSTATE 55 LIMIT OF DETAILED STUDY 550 540 530 530 ELEVATION IN FEET (NAVD) 520 510 500 520 510 500 490 TROY ROAD 490 0.2% ANNUAL CHANCE FLOOD 480 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 470 CROSS SECTION LOCATION 56,000 58,000 60,000 62,000 64,000 66,000 68,000 70,000 72,000 74,000 76,000 78,000 STREAM DISTANCE IN FEET ABOVE MOUTH 12P
510 510 500 490 CITY OF ALTON CORPORATE LIMITS NORTH RODGERS AVENUE SEMINARY STREET NORTH RODGERS ROAD 500 490 480 480 ELEVATION IN FEET (NAVD) 470 460 450 470 460 450 440 440 0.2% ANNUAL CHANCE FLOOD 430 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 420 CROSS SECTION LOCATION 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 STREAM DISTANCE IN MILES ABOVE MOUTH 13P
530 530 520 510 CONFLUENCE OF BLACK CREEK LIMIT OF DETAILED STUDY 520 510 500 500 ELEVATION IN FEET (NAVD) 490 480 470 2%, 1%, AND 0.2% ANNUAL CHANCE FLOODS COINCIDE IN THIS REGION 490 480 470 460 460 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 450 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 440 1.40 1.50 1.60 1.70 STREAM DISTANCE IN MILES ABOVE MOUTH 14P
465 SOUTH FLANK WOOD RIVER LEVEE MAIN STREET WASHINGTON AVENUE 6TH STREET WOOD RIVER AVENUE 5TH STREET DOUGLAS STREET LIMIT OF DETAILED STUDY 460 455 450 ELEVATION IN FEET (NAVD) 445 440 435 430 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 0 500 1000 1500 2000 2500 3000 3500 4000 STREAM DISTANCE IN FEET ABOVE SOUTH FLANK WOOD RIVER LEVEE 15P
490 490 480 470 CONFLUENCE OF WEST FORK WOOD RIVER LIMIT OF FLOODING AFFECTING VILLAGE OF EAST ALTON CORPORATE LIMITS POWDER MILL ROAD RAILROAD MAGAZINE ROAD VILLAGE OF EAST ALTON CORPORATE LIMITS 480 470 460 460 ELEVATION IN FEET (NAVD) 450 440 430 450 440 430 420 420 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 410 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 400 12,000 14,000 16,000 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 34,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 18P
490 480 470 460 ELEVATION IN FEET (NAVD 88) 450 440 430 420 0.2% ANNUAL CHANCE FLOOD 410 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 400 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10,000 10,500 11,000 11,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 28P
500 490 480 470 ELEVATION IN FEET (NAVD 88) 460 450 440 430 0.2% ANNUAL CHANCE FLOOD 420 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 410 11,500 12,000 12,500 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 18,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 29P
530 520 510 500 ELEVATION IN FEET (NAVD 88) 490 480 470 460 0.2% ANNUAL CHANCE FLOOD 450 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 440 18000 18,500 19,000 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000 24,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 30P
550 540 530 520 ELEVATION IN FEET (NAVD 88) 510 500 490 480 0.2% ANNUAL CHANCE FLOOD 470 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 460 24,500 25,000 25,500 26,000 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 31,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CAHOKIA CANAL 31P
610 610 600 590 LIMIT OF DETAILED STUDY 600 590 580 580 ELEVATION IN FEET (NAVD 88) 570 560 550 570 560 550 540 540 0.2% ANNUAL CHANCE FLOOD 530 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 520 6500 7000 7500 8000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 5 CROSS SECTION LOCATION 36P
515 510 505 E. INGLE DRIVE LIMIT OF DETAILED STUDY 500 ELEVATION IN FEET (NAVD 88) 495 490 485 CULVERT 480 0.2% ANNUAL CHANCE FLOOD 475 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 470 0 500 1000 1500 2000 2500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDY'S BRANCH CROSS SECTION LOCATION 37P
530 525 520 AUTUMN GLEN DRIVE PUBLIC WORKS ENTRANCE ASH ROAD LIMIT OF DETAILED STUDY 515 CULVERT ELEVATION IN FEET (NAVD 88) 510 505 500 CULVERT CULVERT 495 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 490 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 485 0 500 1000 1500 2000 2500 3000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 9 38P
525 520 515 510 ELEVATION IN FEET (NAVD 88) 505 500 495 490 0.2% ANNUAL CHANCE FLOOD 485 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 480 0 500 1000 1500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH TRIBUTARY 9 CROSS SECTION LOCATION 39P
525 520 515 510 ELEVATION IN FEET (NAVD 88) 505 500 495 490 0.2% ANNUAL CHANCE FLOOD 485 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 480 0 500 1000 1500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH CROSS SECTION LOCATION 40P
510 500 490 480 ELEVATION IN FEET (NAVD 88) 470 460 450 440 0.2% ANNUAL CHANCE FLOOD 430 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 420 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 41P
530 520 510 500 ELEVATION IN FEET (NAVD 88) 490 480 470 460 0.2% ANNUAL CHANCE FLOOD 450 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 440 6500 7000 7500 8000 8500 9000 9500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH 42P
560 550 540 530 ELEVATION IN FEET (NAVD 88) 520 510 500 490 0.2% ANNUAL CHANCE FLOOD 480 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 470 13,000 13,500 14,000 14,500 15,000 15,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS BRANCH CROSS SECTION LOCATION 43P
525 520 515 510 ELEVATION IN FEET (NAVD 88) 505 500 495 490 0.2% ANNUAL CHANCE FLOOD 485 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 480 0 500 1000 1500 2000 2500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JUDYS CREEK CROSS SECTION LOCATION 44P
470 470 1% ANNUAL CHANCE BACKWATER FROM MISSISSIPPI RIVER WOOD RIVER EAST FORK WOOD RIVER 460 450 CONFLUENCE WITH MISSISSIPPI RIVER VILLAGE OF EAST ALTON CORPORATE LIMITS VILLAGE OF EAST ALTON CORPORATE LIMITS RAILROAD EAST BROADWAY ROAD SAINT LOUIS AVENUE RAILROAD RAILROAD RAILROAD VILLAGE OF EAST ALTON CORPORATE LIMITS 460 450 440 440 ELEVATION IN FEET (NAVD) 430 420 410 LEWIS AND CLARK BOULEVARD MILTON ROAD 430 420 410 400 400 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 390 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 380 0 2000 4000 6000 8000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MISSISSIPPI RIVER 85P