2016 UNDERWATER BRIDGE INSPECTION REPORT. CR 356 over STREAM. Date of Inspection: Equipment Used: 06/20/2016. County Highway Agency.

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1 2016 UDERWATER BRIDGE ISPECTIO REPORT BRIDGE # 7763 CR 356 over STREAM DISTRICT: District 1 COUTY: St. Louis CITY/TOWSHIP: STURGEO STATE: Minnesota Date of Inspection: Equipment Used: 06/20/2016 Owner: County Highway Agency Inspected By: Janulis, Lukas Report Written By: Lukas Janulis 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 PHOTOGRAPHS 10 BRIDGE 7763 UDERWATER ISPECTIO DRAWIGS

3 UDERWATER ISPECTIO REPORT SUMMARY The substructure units inspected at Structure o. 7763, Box 1 and Box 2 of the culvert, were found to be in fair condition with only minor defects of structural significance below water. Moderate scaling and areas of poor concrete consolidation were observed throughout the culvert walls, the scaling had a typical penetration of 1/4 inch and a maximum penetration of 3/4 inch and the areas of poor concrete consolidation had a maximum penetration of 1.5 inches. Random hairline to 1/8 inch wide vertical cracks were observed throughout both boxes of the culvert. Three vertical reinforcing bars with less than 10 percent section loss, were exposed on the south wall of Box 1 due to heavy scaling. The Box 2 hydraulic opening was severely reduced by a silt buildup, up to 4 feet high, at the upstream and downstream openings. The channel flow has been directed through Box 1. The overall condition of the culverts has not significantly changed since the previous underwater inspection. ISPECTIO FIDIGS (A) The channel bottom material consisted of soft silt with a maximum probe rod penetration of 2 feet. (B) The concrete along the walls of the culvert exhibited moderate scaling with a typical penetration of 1/4 inch and a maximum penetration of 3/4 inch extending from the channel bottom to 3 feet above the waterline. Random areas of poor concrete consolidation with a maximum penetration of 1.5 inches were observed along this area. (C) Random hairline to 1/8 inch wide vertical cracks were observed on the walls of both culvert boxes extending from the channel bottom to 6 feet above the waterline. (D) A band of heavy scaling was observed on the south wall of Box 1 from the upstream opening to the downstream quarter point and extending from the channel bottom to 1 foot above the waterline. The scaling exhibited a typical penetration of 1 inch and a maximum penetration of 2 inches. Three vertical reinforcing bars were exposed and exhibited less than 10 percent loss of section. (E) The Box 2 hydraulic opening has been significantly reduced by a silt buildup, up to 4 feet high, at the upstream and downstream openings. The channel flow has been mostly directed through Box 1. RECOMMEDATIOS (A) The area of heavy scaling with exposed reinforcing steel has not significantly worsened since the previous underwater inspection; however, it should ideally be repaired to prevent further deterioration. The repair should include removal of concrete to a minimum of 1 inch behind the reinforcing steel, cleaning and replacing reinforcing steel as required, and placing concrete designed to provide high durability with low permeability. (B) The heavy silt buildup in Box 2 should be removed in order to restore the hydraulic capacity of the structure. (C) Reinspect the submerged substructure units at the normal maximum recommended (BIS) interval of sixty (60) months. Contractor: Contractor Job umber: Collins Engineers, Inc Page 3 of 13

4 UDERWATER ISPECTIO 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: 9 STREAM CR 356 District 1 County: St. Louis Bridge Description: The culvert consists of two reinforced concrete culvert boxes designated as Box 1 and Box 2 from north to south. 2. ISPECTIO DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Lukas Janulis Lukas Janulis 06/20/2016 Sunny, 75 F 2.0 feet 0.5 ft/sec 3. SUBSTRUCTURE ISPECTIO DATA Substructure(s) Inspected: Box 1 and Box 2 General Shape: The culvert consists of two reinforced concrete box barrels measuring 12 feet wide by 48 feet long. Maximum Water Depth at Substructure(s) Inspected (feet): 5.2 feet 4. WATERLIE DATUM Water Level Reference: Waterline Elevation (feet): Description: The top of the east headwall at the centerline of Box feet The waterline was located approximately 6.1 feet below the 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: Item 92B: Underwater Inspection: Code: Code: Code: Code: 5 5 Y 48 06/2016 Page 4 of 13

5 Item 113: Scour Critical Bridge: Code: E 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 241 Concrete Culvert 95 LF Culvert End Treatment 2 EA Scour 1 EA 1 Page 5 of 13

6 UDERWATER ISPECTIO ISPECTIO PROCEDURES The routine underwater inspection of Bridge 7763 (C.R. 356 over Stream) was completed on June 20, The underwater inspection was conducted from shore. The inspection was conducted by a team consisting of a Professional Engineer Diver with a valid MnDOT Team Leader certification, a backup diver and dive tender. Due to waterway conditions at the time of the inspection, the inspection could be accomplished by wading in accordance with OSHA regulations. Channel bottom profiles were taken along the upstream and downstream openings to determine the presence, location and area of scour. The bridge elements inspected were the two reinforced concrete box culverts. Inspection procedures followed FHWA guidance and the MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for foundations. The maximum routine underwater inspection frequency is recommended to remain at 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 13

7 Bridge ID: 9 Minnesota Structure Inventory Report CR 356 over STREAM + G E E R A L + + R O A D W A Y + + I S P E C T I O + Date: 10/31/2016 Agency Br. o. 639 Crew Bridge Match ID (TIS) 0 Userkey 109 District 01 County St. Louis Route Sys 07 - CTY umber 356 Functionally Obsolete City Sect., Twp., Range Main Span Type 1 - Concrete Median Width On Bridge Main Span Design Main Span Detail Appr. Span Type Appr. Span Design Appr. Span Detail Skew 0 Abutment - /A Culvert Type W1210D Foundation (Material/Type) - /A Barrel Length 48 Cantilever ID Pier Foundation - /A (Material/Type) - /A MAI: 2 Main Span Length Structure Length 13 - Box Culvert umber of Spans APPR: 0 TOTAL: 12.0 Deck Width (Out-to-Out) 0.0 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) 0 sq. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height 1.9 MI OF JCT CSAH22 Level of Service 1 - MAILIE W Roadway Type Lt - ot Applicable 8 - Gravel ot Applicable (applies - ot Applicable (no deck) 50B. Rt Rt + M I S C. Structure Flared Parallel Structure Field Conn. ID Historic Status Underwater 60 Pinned Asbly. Spec. Feat avigation Control sq. Year Painted Painted Area Primer Type Posted Load Traffic B R I D G E D A T A o flare 5 - ot eligible + P A I T + Bridge Railing - OT REQUIRED - o parallel structure 0 - ot Required 0 - ot Required Horizontal 1 - Object Markers 0.00 Vertical Unsound Paint % Finish Type + B R I D G E 2-2-way traffic Latitude ' '' Control Section (TH Only) Status Longitude ' '' Reference Point Custodian Owner 02 - County Highway Agency 02 - County Highway Agency Roadway ame or Description Township STURGEO CR 356 Desc. Loc. BMU Agreement Year Built 1947 M Year Reconstructed FHWA Year Reconstructed M Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 8.0 mi. Lanes Route On Structure On - Off System 0 - OFF Roadway Width Legislative District 05A Vertical Clearance Potential ABC 2 - /A Max. Vert. Clear. Service On 1 - Highway Appr. Surface Width Service Under 0 - O PLA + 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 GR Transition Appr. Guardrail GR Termini Frac. Critical + I Drainage Area (sq. mi.) + W A T E R W A Y + Waterway Opening (sf.) 240 Pier Protection Posting VEH: Rating Date 2/1/ OT REQUIRED 0 - SUBSTADARD 0 - SUBSTADARD D E P T H I S P. + Y/ Freq Date 06/20/ o nav. control on Rail Type Lt Rt A - /A B - /A C - /A sq. ADTT 09 - Rural - Local 26.0 S I G S + Structurally Deficient Sufficiency Rating 86.3 Routine Inspection Date 10/20/2015 Routine Inspection Frequency 24 Inspector ame + B I av. Clr. () av. Vert. Lift Bridge Clear. () M Scour Code Operating Rating Janulis, Lukas A - Open C O D I T I O Deck Unsound Superstructure Deck % Underclearances Waterway Adequacy 8 Approach Alignment 8 0 D I M E S I O S + B-EB % SB-WB Substructure Channel 5 Culvert 5 + B I Structure Evaluation 5 Deck Geometry E - CULVERT Design Load 4 - H 20 SEMI: Overweight Permit Codes _ Vert. 0.0 Horiz. 1 - H TRUCK R A T I G S + Year + C A P A C I T Y R A T I G S + Inventory Rating 1 - H TRUCK 18.0 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 13

8 11/08/2016 Inspector: CO Bridge MIESOTA BRIDGE ISPECTIO REPORT BRIDGE 9 CR 356 OVER STREAM County: City: Township: St. Louis Location: 1.9 MI OF JCT CSAH22 Route: 07 - CTY 356 Ref. Pt.: STURGEO Control Section: Section: 6 Township: 061 Range: 20W Maint. Area: Span Type: 1 - Concrete 19 - Culvert (includes Local Agency Bridge br.: 639 List: frame culverts) BI Deck: Super: Sub: Chan: 5 Culv: 5 Open, Posted, Closed: A - Open M Scour Code: E - CULVERT Appraisal Ratings - Approach: 8 Waterway: 8 Required Bridge Signs - Load Posting: 0 - ot Required Traffic: 0 - ot Required Horizntal: 1 - Object Markers Vertical: - ot Applicable Length: 26.5 Deck Width: 0.0 Rdwy. Area/ Pct. Unsnd: sq. / % Paint Area/ Pct. Unsnd: sq. / % Culvert: W1210D Postings: Unofficial Structurally Deficient Unofficial Functionally Obsolete Unofficial Sufficiency Rating 86.3 ELEM BR ELEMET AME REPORT TYPE ISP. DATE QUATITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Culvert 10/31/ LF Underwater 95 LF otes: [ ] Moderate scale along wetted perimeter both barrels exposing aggregates. Spalls along water line of barrel 2 with no exposed rebar. Hairline to 1/8" vertical cracks spaced 4' to 14' both barrels. Hairline horizontal crack barrel 2 north wall 1' below top haunch. Leakage through bottom of top haunch east ends of barrel 1 south wall and barrel 2 north wall 8' to 10'. Critical Deficiencies or Safety Hazards 10/31/ EA Underwater otes: [ ] o critical findings during this inspection. 1 EA Culvert End Treatment 10/31/ EA Underwater 2 EA otes: [ ] Moderate scale along wetted perimeter on both end treatments. Spalling on center wing west end at waterline barrel 2 Roadway Over Culvert 10/31/ EA Underwater otes: [ ] o signs of settlement or undermining. Gravel. 1 EA Scour 10/31/ EA Underwater Other Bridge Signing 10/31/ EA Underwater otes: [2015] West marker leaning away from roadway. [2013] Both culvert markers present. East marker blocked by trees. Reflectors ( West only ). 1 EA Slopes & Slope Protection 10/31/ EA Underwater otes: [2015] 1' to 2' of back of wings exposed and barrel behind east headwall exposed. [2013] Erosion behind all wings. Slopes protected by vegetation. 2 EA Deck & Approach Drainage 10/31/ EA Underwater otes: [2015] Drainage from roadway may be contributing to erosion behind wings. [2013] o notable ponding or drainage-related slope erosion. 2 EA Page 8 of 13

9 BRIDGE 9 CR 356 OVER STREAM ELEM BR ELEMET AME REPORT TYPE ISP. DATE QUATITY CS 1 CS 2 CS 3 CS 4 Protected Species 10/31/ EA Underwater otes: Use this element to track the presence of protected species living on this structure. 1 EA General otes: 58. Deck BI: 36A. Brdg Railings BI: 36B. Transitions BI: 36C. Appr Guardrail BI: 36D. Appr Guardrail Terminal BI: 59. Superstructure BI: SLC District 3 Inspected by: [ ] CG. o Guardrail. [2015] 6' of water in culvert due to beaver dam to south. o rail attached to culvert. o rail attached to culvert. Roadway slopes do not meet minimum requirements for Minnesota rule for ADT < 50. Slope on SE about 1:1 inside of clear zone. Roadway slopes do not meet minimum requirements for Minnesota rule for ADT < 50. Slope on SE about 1:1 inside of clear zone. 60. Substructure BI: 61. Channel BI: 62. Culvert BI: 71. Waterway Adeq BI: 72. Appr Roadway Alignment BI: [2015] Beaver dam to south restricting flow in stream. Channel deterioration due to high water and beaver activity. CHAEL BRUSHY AD OVERGROW. SOUTH CULVERT IS SILTED I AD OLY FLOWS I HIGH WATER. [ ] Moderate scale along wetted perimeter both barrels exposing aggregates. Spalls along water line of barrel 2 with no exposed rebar. Hairline to 1/8" vertical cracks spaced 4' to 14' both barrels. Hairline horizontal crack barrel 2 north wall 1' below top haunch. Leakage through bottom of top haunch east ends of barrel 1 south wall and barrel 2 north wall 8' to 10'. [2015] Highwater mark about 3' below top of culvert plus 3' of fill. Limited chance of overtopping roadway. [2015] o sight distance issues or speed reduction required. Inventory otes: [2015] Edit SIA to show that bridge is located on CR 356 instead of CSAH 107. Inspector's Signature Reviewer's Signature Page 9 of 13

10 Pictures Photo 1 - Upstream Openings, Looking Southwest Photo 2 - Downstream Openings, Looking East Page 10 of 13

11 Pictures Photo 3 - Typical Concrete Condition (orth Wall of Box 2 Shown), Looking orth Page 11 of 13

12 48' Flow ~ Box '-0" '-0" ~ Box 2 12'-0" Shoreline (Typ.) SOUDIG PLA GEERAL OTES: ISPECTIO OTES: Legend 1. Box 1 and Box 2 of culvert were inspected underwater. 2. At the time of inspection on June 20, 2016, the waterline was located approximately 6.1 feet below the top of the east headwall at the centerline of Box 1. Since insufficient elevation information was available, an elevation of was assumed. This corresponds to a waterline elevation of Soundings indicate the water depth at the time of inspection and are measured in feet The channel bottom material consisted of soft silt with a maximum probe rod penetration of 2 feet. The concrete along the walls of the culvert exhibited moderate scaling with a typical penetration of inch and a maximum penetration of ƒ inch extending from the channel bottom to 3 feet above the waterline. Random areas of poor concrete consolidation with a maximum penetration of 1.5 inches were observed along this area. Random hairline to 1/8 inch wide vertical cracks were observed on the walls of both culvert boxes extending from the channel bottom to 6 feet above the waterline Sounding Depth from Waterline (6/20/2016) -2.6 Sounding Depth from Waterline (9/18/2012) otes: All soundings are based on 2016 waterline location. 4 5 A band of heavy scaling was observed on the south wall of Box 1 from the upstream opening to the downstream quarter point and extending from the channel bottom to 1 foot above the waterline. The scaling exhibited a typical penetration of 1 inch and a maximum penetration of 2 inches. Three vertical reinforcing bars were exposed which exhibited less than 10 percent loss of section. The Box 2 hydraulic opening has been significantly reduced by a silt buildup, up to 4 feet high, at the upstream and downstream openings. The channel flow has been mostly directed through Box 1. MIESOTA DEPARTMET OF TRASPORTATIO UDERWATER BRIDGE ISPECTIO STRUCTURE O CR 356 OVER A STREAM DISTRICT 1, ST. LOUIS COUTY ISPECTIO AD SOUDIG PLA DRAW BY: MBP CHECKED BY: LJ 123 orth Wacker Drive Suite 900 Chicago, Il (312) DATE: JUE 20, 2016 SCALE: 1"=10'-0" Page 12 of 13 CODE: FIGURE O.: 1

13 ~ Box 1 ~ Box W.L. El Channel Bottom on 6/20/2016 Channel Bottom on 9/18/2012 UPSTREAM OPEIG PROFILE ~ Box 1 ~ Box W.L. El ote: Refer to Figure 1 for General otes. MIESOTA DEPARTMET OF TRASPORTATIO UDERWATER BRIDGE ISPECTIO 85.0 Channel Bottom Channel Bottom on 6/20/2016 on 9/18/2012 DOWSTREAM OPEIG PROFILE 85.0 DRAW BY: MBP STRUCTURE O CR 356 OVER A STREAM DISTRICT 1, ST. LOUIS COUTY UPSTREAM AD DOWSTREAM FASCIA PROFILES 123 orth Wacker Drive DATE: JUE 20, 2016 CHECKED BY: LJ Suite 900 Chicago, Il (312) SCALE: 1"=5'-0" Page 13 of 13 CODE: FIGURE O.: 2