2017 UNDERWATER BRIDGE INSPECTION REPORT. CSAH 7 over ST LOUIS RIVER. Date of Inspection: Equipment Used: 09/12/2016. County Highway Agency

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1 2017 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # CSAH 7 over ST LOUIS RIVER DISTRICT: District 1 COUNTY: St. Louis CITY/TOWNSHIP: MCDAVITT STATE: Minnesota Date of Inspection: Equipment Used: 09/12/2016 Owner: County Highway Agency Inspected By: Parker, Marc Report Written By: Marc Parker Report Reviewed By: Final Report Date:

2 TABLE OF CONTENTS PAGE NUMBER UNDERWATER SUMMARY 3 UNDERWATER INSPECTION 4 UNDERWATER INSPECTION PROCEDURES 6 STRUCTURE INVENTORY 7 ELEMENTS 8 PHOTOGRAPHS 12 BRIDGE UNDERWATER INSPECTION DRAWINGS

3 UNDERWATER INSPECTION REPORT SUMMARY The substructure unit inspected below water at Bridge No , Pier 1, was in good condition with no defects of structural significance. Light concrete scaling was observed from the waterline to 3 feet below the waterline, with a maximum 1/4 inch penetration. Footing exposure was detected around the pier perimeter with a maximum vertical exposure of 3 inches. A light timber debris accumulation was observed at the upstream nose of Pier 1 consisting of logs and branches up to 12 inch diameter. The debris extended from the channel bottom to 2 feet above the waterline. Overall the inspection findings are consistent with the previous underwater inspection. INSPECTION FINDINGS (A) The channel bottom material consisted of gravel and sand with random pieces of riprap 12 inch diameter and smaller, allowing up to 3 inches of probe rod penetration. (B) Light concrete scaling, with 1/8 inch typical penetration up to 1/4 inch maximum was observed on Pier 1 from the waterline to 3 feet below the waterline. (C) The top of footing was exposed around the footing perimeter with a maximum of 3 inches on the south face. (D) A light accumulation of timber debris consisting of logs and branches up to 12 inches in diameter and extending from the channel bottom to 2 feet above the waterline was present around the upstream nose. RECOMMENDATIONS (A) Monitor the extent of footing exposure at Pier 1 during future underwater inspections. (B) Monitor the timber debris accumulation at Pier 1, during future inspections, and if found to be increasing to a more detrimental extent, removal operations may become warranted at that time. (C) Reinspect the submerged substructure units at the normal maximum recommended (NBIS) interval of sixty (60) months. Contractor: Contractor Job Number: Collins Engineers, Inc Page 3 of 14

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: County: ST LOUIS RIVER CSAH 7 District St. Louis Bridge Description: The superstructure consists of two spans of precast beams supporting a reinforced concrete deck. The bridge is supported by two reinforced concrete abutments and one reinforced concrete pier. 2. INSPECTION DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Marc Parker Marc Parker 09/12/2016 Overcast, 68 F 2.0 feet 0.5 ft/sec 3. SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: Pier 1 General Shape: The pier consists of a hammerhead pier cap supported by an oblong concrete pier wall. The abutments and pier are founded on concrete footings supported by steel H piles. Maximum Water Depth at Substructure(s) Inspected (feet): 7.6 feet 4. WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: The top of the pier cap at the downstream end of Pier feet The waterline was located approximately 16.0 feet below the reference. 5. NBIS CODING INFORMATION (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: 7 7 Y 48 09/2016 Page 4 of 14

5 Item 113: Scour Critical Bridge: Code: M Bridge is scour critical because abutment or pier foundation is rated as unstable due to observed scour at bridge site. Yes X No (Mark your selection with an X) 6. STRUCTURAL ELEMENT CONDITION RATING Conditions ELEM # Element Description Quantity Unit CS1 CS2 CS3 CS4 210 Reinforced Concrete Pier Wall 24 LF Scour 1 EA 1 Page 5 of 14

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge (CSAH 7 over St. Louis River) was completed on September 12, 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. The inspection utilized commercial dive equipment and techniques in accordance with OSHA regulations. Channel bottom 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 one hammerhead pier. According to the bridge inventory, Pier 1 is founded on a concrete footing supported by steel H piles. 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 14

7 Bridge ID: Minnesota Structure Inventory Report CSAH 7 over ST LOUIS RIVER Date: 01/04/ G E N E R A L + + R O A D W A Y + + I N S P E C T I O N + Agency Br. No. 435 Crew Bridge Match ID (TIS) 0 Userkey 109 District 01 County St. Louis Route Sys 04 - CSAH Number 7 Functionally Obsolete City Sect., Twp., Range Main Span Type 5 - Prestress or Precast 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 MAIN: 2 Main Span Length Structure Length 01 - Beam Span Number of Spans APPR: 0 TOTAL: 88.0 Deck Width (Out-to-Out) 47.3 Deck Material Wear Surf Type Wear Surf Install Year Wear Course/Fill Depth Deck Membrane Deck Rebars Structure Area (Out-to-Out) 8571 sq. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height 0.6 MI S OF JCT CSAH 16 Level of Service 1 - MAINLINE Lt 1 - Concrete Cast-in-Place 1 - Monolithic Concrete Deck Rebars Install Year N - 18W Roadway Type Latitude ' '' Control Section (TH Only) Status None + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status 3 - FTG PILE 1 - CONC 3 - FTG PILE Underwater 60 Pinned Asbly. Spec. Feat Navigation Control Year Painted 7976 sq. Traffic 50B. Rt Rt Painted Area Primer Type Posted Load B R I D G E D A T A No flare 5 - Not eligible + P A I N T + Bridge Railing 1 - MEETS STANDARDS N - No parallel structure GR Transition Appr. Guardrail GR Termini 1 - CONC Frac. Critical 0 - Not Required 0 - Not Required Horizontal 0 - Not Required 0.00 Vertical Unsound Paint % Finish Type 1 - Epoxy Coated Reinforcing + B R I D G E 2-2-way traffic Longitude ' '' Reference Point Custodian Owner 02 - County Highway Agency 02 - County Highway Agency Roadway Name or Description Township MCDAVITT CSAH 7 Desc. Loc. BMU Agreement Year Built 1996 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 16.0 mi. Lanes Route On Structure On - Off System 1 - ON Roadway Width Legislative District 05B Vertical Clearance Potential ABC 2 - N/A Max. Vert. Clear. Service On 1 - Highway Appr. Surface Width Service Under 3 - COUNTY + S T R U C T U R E + HCADT Functional Class If Divided + R D W Y Horizontal Clear. Lateral Clearance ON 2 UNDER ADT 5 - Waterway Bridge Roadway Width YEAR 2008 N - Not Applicable + I N + W A T E R W A Y + Drainage Area (sq. mi.) Waterway Opening (sf.) 1488 Pier Protection Posting VEH: Rating Date 11/12/ MEETS STANDARDS 1 - MEETS STANDARDS 1 - MEETS STANDARDS D E P T H I N S P. + Y/N Freq Date 09/12/ No nav. control on Rail Type Lt 22 Rt 22 A 1 - No B 1 - No C 1 - No Restriction Restriction Restriction sq. ADTT 07 - Rural - Major Collector 40.0 S I G N S + Structurally Deficient Sufficiency Rating 98.8 Routine Inspection Date 10/05/2015 Routine Inspection Frequency 24 Inspector Name + N B I Nav. Clr. () Nav. Vert. Lift Bridge Clear. () MN Scour Code M - STBL - ABV WATER Year + C A P A C I T Y R A T I N G S + Design Load Operating Rating Parker, Marc A - Open C O N D I T I O N Deck 7 Unsound Superstructure 8 Deck % Underclearances Waterway Adequacy 9 Approach Alignment 7 0 D I M E N S I O N S + NB-EB % SB-WB Substructure Channel 7 Culvert + N B I Structure Evaluation 7 Deck Geometry 9 SEMI: Overweight Permit Codes _ Vert. 0.0 Horiz. 9 - HS 25 (OR GREATER) 2 - HS TRUCK R A T I N G S + Inventory Rating 2 - HS TRUCK N N N A P P R A I S A L R A T I N G S + N + S A F E T Y F E A T U R E S + DBL: Page 7 of 14

8 01/05/2017 Inspector: CO Bridge MINNESOTA BRIDGE INSPECTION REPORT BRIDGE CSAH 7 OVER ST LOUIS RIVER County: City: Township: St. Louis Location: 0.6 MI S OF JCT CSAH 16 Length: Route: 04 - CSAH 7 Ref. Pt.: Deck Width: MCDAVITT Control Section: Rdwy. Area/ Pct. Unsnd: 7976 sq. / % Section: 2 Township: 056N Range: 18W Maint. Area: Paint Area/ Pct. Unsnd: sq. / % Span Type: 5 - Prestressed Concrete 2 - Local Agency Bridge Nbr.: 435 Culvert: N/A List: Stringer/Multi-beam or Girder Postings: NBI Deck: 7 Super: 8 Sub: 7 Chan: 7 Culv: N Open, Posted, Closed: A - Open MN Scour Code: M - STBL - ABV WATER Appraisal Ratings - Approach: 7 Waterway: 9 Unofficial Structurally Deficient N Required Bridge Signs - Load Posting: 0 - Not Required Horizntal: 0 - Not Required Traffic: Vertical: 0 - Not Required N - Not Applicable Unofficial Functionally Obsolete Unofficial Sufficiency Rating N 98.8 ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Deck 01/04/ SF Underwater Notes: [ ] No additional deterioration noted. Minor cracks and leaching, honey combed area N. of Pier 8571 SF Wearing Surfaces Underwater 01/04/ SF SF Notes: Top of Concrete Deck with Epoxy Reinforcement Notes: [2015] 1 transverse crack with a width of 0.010" each side of poured deck joint. [2013] Minor scale along shoulders. Minor spalling between approach panels and strip seal joint. [2012] Minor spalls and scrapes on deck, most severe in shoulders. Horizontal crack along pier joint with small spalls warranting CS Prestressed Concrete Open Underwater Girder/Beam Notes: [ ] Staining on east and west fascia beam from cracks in barrier. 01/04/ LF LF Reinforced Concrete Pier Wall 01/04/ LF Underwater 24 LF Notes: [ ] Debris built up on east end of pier wall. [2012 Underwater inspection] Light scaling of 1/8" typ. pen. to a max. of 1/4" pen. at wetted perimeter. Top of footing exposed along both faces with max. vert. exposure of 8" on S. face. Reinforced Concrete Abutment 01/04/ LF Underwater 135 LF Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0). [2015] Minor spalling top of north parapet wall and both have 2' to 3.5" spaced cracks. [2013] Hairline vertical cracks on south abutment 1' to 1.5' east of beam 3 and 4. Hairline vertical cracks on north abutment between beams 9&10, 7&8, and 1' west of beam 7. Hairline vertical cracks with leaching spaced 4' to 6' along parapet wall. Crack at centerline has rust staining No deterioration noted. Wingwall notes: [2015] Minor cracking with leaching along construction joint on wings. [ ] About 5 feet of horizontal cracking on the SE, NE and NW wingwall with 10 feet of cracking on the SW wingwall. Reinforced Concrete Pier Cap 01/04/ LF Underwater Notes: [ ] No deterioration noted. 46 LF Strip Seal Expansion Joint 01/04/ LF Underwater Notes: [2015] Corrosion present metal of strip seal joint [ ] Joints are filled with debris. Screw missing from NE cover plate. Screws need tightening on NW cover plate. Page 8 of LF

9 BRIDGE CSAH 7 OVER ST LOUIS RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Pourable Joint Seal 01/04/ LF Underwater Notes: [2015] 3' of joint sealant missing. [ ] Cracking and spalling near pier joint. Joint has no leakage and sealant still intact. 43 LF Elastomeric Bearing 01/04/ EA Underwater Notes: [ ] No deterioration noted. [2012] Element represents bearings at abutment. 10 EA Fixed Bearing 01/04/ EA Underwater Notes: [ ] No deterioration noted. [2012] Element represents bearings at piers. 10 EA Reinforced Concrete Approach Slab 01/04/ SF Underwater 1600 SF Notes: [2016] Migrator assumed an approach slab length of 20FT and used the inventory quantity of 40FT for the width. [2015] South panel longitudinal crack is 0.010" in width. [2013] North panel has minor scale along west shoulder [2012] Minor spalling on both approach panels warranting CS2. Spalling on south approach, east end with a longitudinal crack. Spalling on N. panel especially bad on W. end. Reinforced Concrete Bridge Railing 01/04/ LF Underwater 413 LF Notes: [2015] 0.020" wide crack at middle of each rail panel. Some scrapes have gouges from plows. [2013] Hairline vertical cracks on rails spaced 2' feet. Scrapes from plows at base of rail and some pitting on rail face. [2012] Vertical cracks on both barriers. Several cracks on W. rail. Critical Deficiencies or Safety Hazards 01/04/ EA Underwater Notes: [ ] No critical findings during this inspection. 1 EA Concrete Decks - Cracking & Sealing 01/04/ LF Underwater Notes: [2015] 1 transverse crack with a width of 0.010" each side of poured deck joint. [ ] Cracks are of moderate size and insignificant density. 0 LF Secondary Members (Superstructure) 01/04/ EA Underwater Notes: [ ] Pigeon debris on diaphragms. No additional deterioration noted. Element represents intermediate and end diaphragms. 24 EA Concrete Shear Cracking 01/04/ EA Underwater 1 EA Notes: Use this element to monitor the presence of shear cracking on concrete elements. Pay particular attention to the prestressed concrete beams. Scour 01/04/ EA Underwater 1 EA Notes: [ Underwater inspection] Minor scour of at pier - Top of footing is exposed along both faces with max. vert. exposure of 8" on S. face. Page 9 of 14

10 BRIDGE CSAH 7 OVER ST LOUIS RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Other Bridge Signing 01/04/ EA Underwater Notes: [2015] All signs present with little to no deterioration. [2013] All signs present. NE sign bent slightly. [2012] NE delineator missing warranting CS3. 1 EA Slopes & Slope Protection 01/04/ EA Underwater 2 EA Notes: [ ] No notable erosion. [2012] Tree and brush removal needed at all 4 corners of bridge. Riprap needed on both abutment slopes. Guardrail 01/04/ EA Underwater Notes: [2015] Impact damage with broken post NE guardrail. [ ] Small dent in SW guardrail. Flex Beam w/ 3- BCT ends & 1-wrap. 1 EA Deck & Approach Drainage 01/04/ EA Underwater 2 EA Notes: [2015] Sand along gutterlines restricting flow to catch basins. NE catch basin partially blocked by sand deposits. No drainage-related slope erosion. [2013] Minor sand deposits along gutterline. Drains are free of debris. Sidewalk, Curb, & Median 01/04/ EA Underwater Notes: [ ] No additional deterioration noted. 2' piece of curb broken off SW end. 1 EA Miscellaneous Items 01/04/ EA Underwater Notes: [2015] Bat droppings on top of abutments. [ ] Graffiti on abutments and end diaphragms as well as pier walls. 2 EA Protected Species 01/04/ EA Underwater Notes: Use this element to track the presence of protected species living on this structure. 1 EA General Notes: SLC District 7 Inspected by: [2015] CG : [2013] CG, BH. [7/09/2012] Post 2012 Flood Inspection by JRM and RRC from TKDA. Underwater inspection performed by WSB. 58. Deck NBI: 36A. Brdg Railings NBI: 36B. Transitions NBI: 36C. Appr Guardrail NBI: 36D. Appr Guardrail Terminal NBI: 59. Superstructure NBI: 60. Substructure NBI: 61. Channel NBI: [2015] 1 transverse crack with a width of 0.010" each side of poured deck joint. [2013] Minor scale along shoulders. Minor spalling between approach panels and strip seal joint. Concrete barrier type F. Transition meets minimum requirements in inspection manual. Flexbeam with timber posts. 3 ELT End Terminals with 1 radius. [ ] Staining on east and west fascia beam from cracks in barrier. Pigeon debris on diaphragms. [2015] Minor spalling top of north parapet wall and both have 2' to 3.5" spaced cracks. [2013] Hairline vertical cracks on south abutment 1' to 1.5' east of beam 3 and 4. Hairline vertical cracks on north abutment between beams 9&10, 7&8, and 1' west of beam 7. Hairline vertical cracks with leaching spaced 4' to 6' along parapet wall. Crack at centerline has rust staining. No deterioration to pier wall and pier cap. [2012 Underwater inspection] Light scaling of 1/8" typ. pen. to a max. of 1/4" pen. at wetted perimeter. Top of footing exposed along both faces with max. vert. exposure of 8" on S. face. [2015] Minor debris accumulation on east end of pier. Page 10 of 14

11 BRIDGE CSAH 7 OVER ST LOUIS RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS Culvert NBI: 71. Waterway Adeq NBI: 72. Appr Roadway Alignment NBI: Inventory Notes: [2015] 3' to 4' of freeboard between beams and highwater mark on pier. Bridge plan indicates 8' of freeboard during 50 year event. [2015] Small hill north and south slightly affecting sight distance. No speed reduction required. Inspector's Signature Reviewer's Signature Page 11 of 14

12 Pictures Photo 1 - Upstream Fascia, Looking Southwest Photo 2 - Pier 1, Looking Southwest Page 12 of 14

13 N GENERAL NOTES: 1. Pier 1 was inspected underwater. 88'-0" 88'-0" 2. At the time of inspection on September 12, 2016, the waterline was located approximately 16.0 feet below the top of the pier cap at the downstream end of Pier 1. This corresponds with a waterline elevation of feet based on bridge design plans dated Dec. 8, Soundings indicate the water depth at the time of inspection and are measured in feet. 4. Soundings were taken parallel to the bridge at 1/4 point intervals between the substructure units INSPECTION NOTES: T/F The channel bottom material consisted of gravel and sand with random pieces of riprap 12 inch diameter and smaller, allowing up to 3 inches of probe rod penetration Light concrete scaling, with 1/8 inch typical penetration up to 1/4 inch maximum was observed on Pier 1 from the waterline to 3 feet below the waterline. 3 The top of footing was exposed around the footing perimeter with a maximum 3 2 vertical exposure of 3 inches on the south face. Shoreline (Typ.) Pier A light accumulation of timber debris, consisting of logs and branches up to 12 inches in diameter and extending from the channel bottom to 2 feet above the waterline was present around the upstream nose. Legend St. Louis River -6.5 Sounding Depth from Waterline (9/12/16) -6.8 Sounding Depth from Waterline (7/24/12) Timber Debris Note: SOUNDING PLAN All soundings are based on 2016 waterline location. MINNESOTA DEPARTMENT OF TRANSPORTATION UNDERWATER BRIDGE INSPECTION STRUCTURE NO OVER THE ST. LOUIS RIVER DISTRICT 1, ST. LOUIS COUNTY INSPECTION AND SOUNDING PLAN DRAWN BY: ELN CHECKED BY: MBP 123 North Wacker Drive Suite 300 Chicago, Il (312) DATE: SEPT 12, 2016 SCALE: NTS Page 13 of 14 CODE: FIGURE NO.: 1

14 ~ Brg. South Abut. ~ Pier 1 ~ Brg. North Abut. 88'-0" 88'-0" Shoreline Shoreline W.L. El Channel Bottom on 7/24/12 Channel Bottom on 9/12/ UPSTREAM FASCIA PROFILE ~ Brg. South Abut. ~ Pier 1 ~ Brg. North Abut. 88'-0" 88'-0" Shoreline Shoreline W.L. El Channel Bottom on 9/12/16 Channel Bottom on 7/24/ DOWNSTREAM FASCIA PROFILE Note: Refer to Figure 1 for General Notes. MINNESOTA DEPARTMENT OF TRANSPORTATION UNDERWATER BRIDGE INSPECTION STRUCTURE NO OVER THE ST. LOUIS RIVER DISTRICT 1, ST. LOUIS COUNTY UPSTREAM AND DOWNSTREAM FASCIA PROFILES DRAWN BY: ELN CHECKED BY: MBP 123 North Wacker Drive Suite 300 Chicago, Il (312) DATE: SEPT 12, 2016 SCALE: 1"=20'-0" Page 14 of 14 CODE: FIGURE NO.: 2