2016 UNDERWATER BRIDGE INSPECTION REPORT. CSAH 14 over BUTLER CREEK. Date of Inspection: Equipment Used: 06/21/2016. County Highway Agency

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1 2016 UDERWATER BRIDGE ISPECTIO REPORT BRIDGE # CSAH 14 over BUTLER CREEK DISTRICT: District 6 COUTY: Goodhue CITY/TOWSHIP: LEO STATE: Minnesota Date of Inspection: Equipment Used: 06/21/2016 Owner: County Highway Agency Inspected By: Lovelace, Barritt Report Written By: Barritt Lovelace Report Reviewed By: Final Report Date:

2 TABLE OF COTETS PAGE UMBER UDERWATER SUMMARY 3 UDERWATER ISPECTIO 4 UDERWATER ISPECTIO PROCEDURES 6 STRUCTURE IVETORY 7 ELEMETS 8 PICTURES 11 DRAWIGS 14

3 UDERWATER ISPECTIO REPORT SUMMARY The substructure unit inspected at Bridge o , Bent 1, was found to be in satisfactory condition with some minor defects of structural significance. The steel pipe piles exhibited light corrosion with delaminations up to 1/16 inch thick. A vertical split at upstream and downstream ends of the cap of Bent 2 was observed extending the full height of the timber cap. The split was 3/4 inches wide with 4 inches of penetration. The bent cap bearing plates typically exhibited heavy corrosion with delaminations up to 3/4 inch thick. Section loss on the bearing plates was typically 40 percent with localized areas of 100 percent loss of section. ISPECTIO FIDIGS (A) All steel pipe piles exhibited minor corrosion with delaminations up to 1/16 inch thick. (B) A vertical split at both the upstream and downstream ends of the cap of Bent 2 was observed extending the full height of the bent cap. The split was typically 3/4 inch wide with a maximum penetration of 4 inches. (C) The bent cap bearing plates on both Bents 1 and 2 exhibited heavy corrosion with delaminations up to 3/4 inch thick. Section loss was typically 40 percent with localized areas of 100 percent loss of section. (D) Channel bottom material typically consisted of sand and gravel allowing 2 inches of probe rod penetration. RECOMMEDATIOS (A) The inspection of the submerged substructure units of Structure o can most likely be accomplished in the future without using a dive team. To perform the underwater inspection, a properly equipped and qualified inspector will have to perform the inspection during a period of low water and low flow. As channel bottom contours and water depths can change abruptly, it is recommended that lead line soundings of water depth be taken along the upstream and downstream fascias to determine whether a wading inspection is possible prior to beginning the inspection. If conditions are unsafe for inspection by wading, then an underwater inspection with the use of a dive team will be required. Contractor: Contractor Job umber: Collins Engineers, Inc Page 3 of 15

4 UDERWATER ISPECTIO 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: County: BUTLER CREEK CSAH 14 District Goodhue Bridge Description: The superstructure consists of timber stringers supported by two timber bents comprised of six 14 inch diameter steel pipe piles. The substructure units are designated as the South Abutment, Bents 1 and 2, and the orth Abutment. 2. ISPECTIO DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Barritt R. Lovelace, P.E. Barritt R. Lovelace, P.E. 06/21/2016 Sunny, 82 F SUBSTRUCTURE ISPECTIO DATA Substructure(s) Inspected: Bent 1 General Shape: Each bent consists of a timber cap over six coated steel pipe piles. Maximum Water Depth at Substructure(s) Inspected (feet): WATERLIE DATUM Water Level Reference: Waterline Elevation (feet): Description: The bottom midspan of the timber stringer on the upstream face, with 100 feet assumed at this point due to lack of plans The waterline was approximately 11.1 feet below reference. 5. BIS CODIG IFORMATIO (Minnesota specific codes are used for 92B and 113) Item 60: Substructure: Item 61: Channel and Channel Protection: Item 62: Culvert: Code: Code: Code: 6 6 Page 4 of 15

5 Item 92B: Underwater Inspection: Item 113: Scour Critical Bridge: Code: Code: Y 48 06/2016 L Bridge is scour critical because abutment or pier foundation is rated as unstable due to observed scour at bridge site. Yes X o (Mark your selection with an X) 6. STRUCTURAL ELEMET CODITIO RATIG Conditions ELEM # Element Description Quantity Unit CS1 CS2 CS3 CS4 225 Steel or CIP Piling 6 EA Scour 1 EA 1 Page 5 of 15

6 UDERWATER ISPECTIO ISPECTIO PROCEDURES The routine underwater inspection of Bridge (CSAH 14 over Butler Creek) was completed on June 21, The underwater inspection was conducted from shore. The inspection was conducted by a team consisting of a PE-Diver with a valid MnDOT Team Leader certification, a backup diver and a dive tender. Due to waterway conditions at the time of inspection, the inspection could be accomplished by wading in accordance with OSHA regulations. Profiles were taken along the upstream and downstream faces of the bridge and around the periphery of substructure units to determine the presence, location and area of scour. The bridge elements inspected consisted of Bent 1. According to the bridge inventory or design drawings, Bent 1 was founded on six coated steel pipe piles. Inspection procedures followed FHWA guidance and the MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for foundations. The routine underwater inspection frequency is recommended to remain at a maximum of 60 months based on those findings and risk factors. Also, inspection procedures should continue to follow the above approach and standard guidance with 100% Level I and 10% Level II intensity efforts. Page 6 of 15

7 Bridge ID: Minnesota Structure Inventory Report CSAH 14 over BUTLER CREEK Date: 09/02/ G E E R A L + + R O A D W A Y + + I S P E C T I O + Agency Br. o. Crew Bridge Match ID (TIS) 0 Userkey 65 District 06 County Goodhue Route Sys 04 - CSAH umber 14 Functionally Obsolete City Sect., Twp., Range Main Span Type 7 - Timber Median Width On Bridge Main Span Design Main Span Detail Appr. Span Type Appr. Span Design Appr. Span Detail Skew 0 Culvert Type Barrel Length Cantilever ID MAI: 3 Main Span Length Structure Length 09 - Slab Span umber of Spans APPR: 0 TOTAL: 32.0 Deck Width (Out-to-Out) 38.5 Deck Material Wear Surf Type Wear Surf Install Year Wear Course/Fill Depth Deck Membrane Deck Rebars Deck Rebars Install Year Structure Area (Out-to-Out) 3234 sq. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height 0.4 MI S OF JCT TH 52 Level of Service 1 - MAILIE W Roadway Type Latitude ' 2.87 '' Control Section (TH Only) Status Lt 8 - Wood or Timber 6 - Bituminous one - ot Applicable (no deck) + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status 4 - PILE BET 8 - CIP 4 - PILE BET Underwater Y 60 Pinned Asbly. Spec. Feat avigation Control Year Painted 3078 sq. Traffic 50B. Rt Rt Painted Area Primer Type Posted Load B R I D G E D A T A o flare 5 - ot eligible + P A I T + Bridge Railing 1 - MEETS STADARDS - o parallel structure GR Transition Appr. Guardrail GR Termini 2 - TIMBER Frac. Critical 1 - Vehicle Only (Type R12-1A) 0 - ot Required Horizontal 1 - Object Markers 0.67 Vertical Unsound Paint % Finish Type + B R I D G E 2-2-way traffic Longitude ' '' Reference Point Custodian Owner 02 - County Highway Agency 02 - County Highway Agency Roadway ame or Description Township LEO CSAH 14 Desc. Loc. BMU Agreement Year Built 1979 M Year Reconstructed FHWA Year Reconstructed M Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 9.0 mi. Lanes Route On Structure On - Off System 1 - O Roadway Width Legislative District 28B Vertical Clearance Potential ABC 2 - /A Max. Vert. Clear. Service On 1 - Highway Appr. Surface Width Service Under 3 - COUTY + S T R U C T U R E + HCADT Functional Class If Divided + R D W Y Horizontal Clear. Lateral Clearance O 2 UDER ADT 5 - Waterway Bridge Roadway Width YEAR ot Applicable + I + W A T E R W A Y + Drainage Area (sq. mi.) 9.9 Waterway Opening (sf.) 510 Pier Protection Posting 0 - SUBSTADARD 0 - SUBSTADARD 0 - SUBSTADARD D E P T H I S P. + Y/ Freq Date VEH: 36 SEMI: Rating Date 07/01/ /21/ o nav. control on Overweight Permit Codes Rail Type Lt 06 Rt 06 A - /A B - /A C - /A sq. ADTT 07 - Rural - Major Collector 36.0 S I G S + Structurally Deficient Sufficiency Rating 97.3 Routine Inspection Date 09/05/2014 Routine Inspection Frequency 24 Inspector ame + B I av. Clr. () av. Vert. Lift Bridge Clear. () Vert. 0.0 Horiz. M Scour Code L - STBL - LOW RISK Year C A P A C I T Y R A T I G S + Design Load 5 - HS 20 Operating Rating Lovelace, Barritt P - Posted for Load C O D I T I O Deck 6 Unsound Superstructure 6 Deck % Underclearances Waterway Adequacy 9 Approach Alignment 9 0 D I M E S I O S + B-EB % SB-WB Substructure Channel 6 Culvert + B I Structure Evaluation 6 Deck Geometry HS TRUCK R A T I G S + Inventory Rating 2 - HS TRUCK A P P R A I S A L R A T I G S + + S A F E T Y F E A T U R E S + DBL: Page 7 of 15

8 10/20/2016 Inspector: CO Bridge MIESOTA BRIDGE ISPECTIO REPORT BRIDGE County: City: Township: Section: 6 Township: 111 Range: 17W Maint. Area: Span Type: 7 - Wood or Timber 1 - Slab List: Goodhue LEO BI Deck: 6 Super: 6 Sub: 6 Chan: 6 Culv: Appraisal Ratings - Approach: Required Bridge Signs - Load Posting: CSAH 14 OVER BUTLER CREEK 9 Waterway: 9 Horizntal: Location: Route: Control Section: 1 - Vehicle Only (Type R12-1A) 1 - Object Markers 0.4 MI S OF JCT TH CSAH 14 Ref. Pt.: Local Agency Bridge br.: Open, Posted, Closed: M Scour Code: Traffic: Vertical: P - Posted for Load L - STBL - LOW RISK 0 - ot Required - ot Applicable Length: Deck Width: Rdwy. Area/ Pct. Unsnd: 3078 sq. / % Paint Area/ Pct. Unsnd: Culvert: /A Postings: sq. / % Unofficial Structurally Deficient Unofficial Functionally Obsolete Unofficial Sufficiency Rating 97.3 ELEM BR ELEMET AME REPORT TYPE ISP. DATE QUATITY CS 1 CS 2 CS 3 CS 4 Timber Slab 06/21/ SF Underwater otes: [2016] Migrator assumed CS SF Wearing Surfaces Underwater 06/21/ SF SF otes: Moderate Longitudinal and Travers crack. The longitudinal crack is in the east driving lane and the transverse cracks are at abutments and piers. Evidence of water leaching through these cracks when viewing underside deck. Remainder of deck has minor cracks and minor to moderate pot holes throughout. Viewing underside deck timber has staining mainly corresponding to cracks in bit surface but no active decay. [cond ] Timber Floor Beam 06/21/ LF Underwater otes: OE 115 LF Timber Abutment 06/21/ LF Underwater 115 LF otes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:30 CS2:10 CS3:0 CS4:0). OE Wingwall notes: Cap atop the E wingwall has been pushed up and separated from the piling (Cond. 2).[2014] Steel Pile 06/21/ EA Underwater 12 EA otes: There is active corrosion with loss of section to all the steel plates atop the CIP. All piling exhibit minor paint peeling above the original ground line, and minor surface corrosion below on sections which were never painted. Cond. 2.[2014] Steel Protective Coating Underwater 06/21/ SF otes: [2016] Migrator assumed CS1 and a quantity of 999 SF. 999 SF Timber Pier Cap 06/21/ LF Underwater 75 LF otes: orth timber cap has crack running vertically through its center. Most severe at the east end tapering to the west. Does not affect serviceability. (Cond. 2) Timber Bridge Railing 06/21/ LF Underwater otes: OE 167 LF Page 8 of 15

9 BRIDGE CSAH 14 OVER BUTLER CREEK ELEM BR ELEMET AME REPORT TYPE ISP. DATE QUATITY CS 1 CS 2 CS 3 CS 4 Critical Deficiencies or Safety Hazards 06/21/ EA Underwater otes: o critical structural deficiencies or serious safety hazards are present on this structure. 1 EA Bituminous Approach Roadway 06/21/ EA Underwater 2 EA otes: Moderate cracking in the approaches at both ends of the bridge. Minor settlement at both approachs. Cond. 2. [Cond. Remains 2014] Scour 06/21/ EA Underwater otes: [2013] Scour code = L. Elem #361 is not required. 890 Load Posting or Vertical Clearance Underwater Signing otes: [2016] Structure requires a vertical clearance sign or load posting sign. 1 EA /21/ EA EA Other Bridge Signing 06/21/ EA Underwater otes: Load posting signs inplace - see photos ortheast paddle board badly faded, remaining 3 good condition. [2014] 1 EA /01/2013: Load Posting Required: 36T. BI 41: Status coded 'B - Open, Posting Required'. Agency to notify MnDOT BADMU when signs are installed note left for folowup to notify MnDOT Slopes & Slope Protection 06/21/ EA Underwater otes: Rip-rap missing from the north slope protection area. 1 EA Deck & Approach Drainage 06/21/ EA Underwater otes: OE 1 EA Sidewalk, Curb, & Median 06/21/ EA Underwater otes: OE 1 EA Protected Species 06/21/ EA Underwater otes: Use this element to track the presence of protected species living on this structure. 1 EA General otes: Channel: Sediment concentrated in the north side of the channel. Inspectors D. Marty [2014] D Marty [2012] (2010) - Tom Ogden & Ethan Seaberg 58. Deck BI: 36A. Brdg Railings BI: 36B. Transitions BI: 36C. Appr Guardrail BI: Page 9 of 15

10 BRIDGE CSAH 14 OVER BUTLER CREEK ELEM BR ELEMET AME REPORT TYPE ISP. DATE QUATITY CS 1 CS 2 CS 3 CS 4 36D. Appr Guardrail Terminal BI: 59. Superstructure BI: 60. Substructure BI: 61. Channel BI: 62. Culvert BI: 71. Waterway Adeq BI: 72. Appr Roadway Alignment BI: Inventory otes: Barritt Lovelace Inspector's Signature Reviewer's Signature Page 10 of 15

11 Pictures Photo 1 - East Elevation, Looking Southwest Photo 2 - West Elevation, Looking Southeast Page 11 of 15

12 Pictures Photo 3 - Typical View of Bent 1, Looking South Photo 4 - View of Upstream Channel, Looking East Page 12 of 15

13 Pictures Photo 5 - View of Downstream Channel, Looking West Page 13 of 15

14 ISPECTIO OTES: 24' 32' 24' 1 Channel bottom material consisted of sand and gravel with 2 inches of maximum probe rod penetration. 2 Vertical splits located at both ends of the bent cap of Bent 2, extended full height of cap, and measured 2 3/4 inch wide by 4 feet long. Shoreline (Typ.) Steel pipe piles at Bents 1 and 2 exhibited areas of minor corrosion with delamination up to 1/16 inch thick. 6 4 Bent cap bearing plates typically exhibited heavy corrosion with areas of delamination up to 3/4 inch thick with typical 40 percent loss of section and localized areas with 100 percent loss of section. (Typ.) (Typ.) 4 5 Flow Butler Creek (Typ.) (Typ.) Bent 1 South Abutment Bent 2 orth Abutment -1.3 SOUDIG PLA 2 Legend GEERAL OTES: Sounding Depth from Waterline (6/21/16) 1. Bent 1 were inspected. Bent 1 was partially in the water at the time of underwater inspection. 1 Pile Identification Designation 2. At the time of inspection on June 21, 2016, the waterline was located approximately 11.1 feet below the bottom of the timber stringer at the midpoint along the east fascia of the bridge. Since elevation information was not available a reference elevation of was assumed. Based on the assumed reference the waterline elevation was Soundings indicate the water depth at the time of inspection and are measured in feet. 14"} Steel Pipe Pile 14"} Battered Steel Pipe Pile 1 Inspection ote umber MIESOTA DEPARTMET OF TRASPORTATIO UDERWATER BRIDGE ISPECTIO STRUCTURE O COUTY BOULEVARD 19 OVER BUTLER CREEK GOODHUE COUTY 4. Soundings from 2012 not included for comparison due to change in channel location. ISPECTIO AD SOUDIG PLA TYPICAL ED VIEW OF BETS Page 14 of 15 Drawn By: BGDO 1599 Selby Avenue Date: June 2016 Suite 206 Checked By: BRL St. Paul, M Scale: TS (651) Project: Figure o.: 1

15 South Abutment ~ Bent 1 ~ Bent 2 24' 32' 24' orth Abutment Shoreline Shoreline W.L. El Channel Bottom on 6/21/ UPSTREAM FASCIA PROFILE South Abutment ~ Bent 1 ~ Bent 2 24' 32' 24' orth Abutment Shoreline Shoreline ote: Refer to Figure 1 for General otes. W.L. El MIESOTA DEPARTMET OF TRASPORTATIO Channel Bottom UDERWATER BRIDGE ISPECTIO 80 on 6/21/ STRUCTURE O COUTY BOULEVARD 19 OVER BUTLER CREEK GOODHUE COUTY DOWSTREAM FASCIA PROFILE UPSTREAM AD DOWSTREAM FASCIA PROFILES Drawn By: BGDO 1599 Selby Avenue Date: June 2016 Checked By: BRL Suite 206 St. Paul, M (651) Scale: 1"=10' Page 15 of 15 Project: Figure o.: 2