2017 UNDERWATER BRIDGE INSPECTION REPORT. ELM WAY over MINNESOTA RIVER. Date of Inspection: Equipment Used: 06/07/2017. County Highway Agency

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1 2017 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # ELM WAY over MINNESOTA RIVER DISTRICT: Metro COUNTY: Scott CITY/TOWNSHIP: BLAKELY STATE: Minnesota Date of Inspection: Equipment Used: 06/07/2017 Owner: County Highway Agency Inspected By: Owens, Garrett Report Written By: Cory Stuber 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 PICTURES 13 DRAWINGS 17

3 UNDERWATER INSPECTION REPORT SUMMARY The substructure units inspected at Bridge 70535, Piers 1 through 3, were in overall good condition with no defects of structural significance observed. A localized scour depression was observed around the perimeter of Pier 3. A moderate accumulation of timber debris was observed at the upstream nose and along the west face of Pier 2. Heavy embankment erosion was observed along the west shoreline. A large area of general scour was observed around Pier 1, and extended downstream of bridge. INSPECTION FINDINGS (A) The concrete was smooth and sound with no notable defects. (B) A 10 foot radius scour depression 5 to 6 feet deep was observed around the perimeter of Pier 3. (C) The channel bottom consisted of silty clay and rocks with 12 inches maximum probe rod penetration. (D) A moderate accumulation of timber debris consisting of 1 foot diameter and smaller logs and branches was observed at the upstream nose and along the west face of Pier 2. (E) The channel bottom consisted of silty clay with 6 inches maximum probe rod penetration along the east face and 6 inch diameter rocks along the west face of Pier 1. (F) Heavy embankment erosion along the west shoreline consisting of up to 5 foot high vertical banks. (G) General scour observed around Pier 1, up to 12 feet deep adjacent to pier, and up to 18 feet deep downstream of bridge. Area was up to 40 feet wide and extended approximately 150 feet downstream. RECOMMENDATIONS (A) Consideration should be given for an in-depth scour analysis given the change in channel bottom elevations compared to the 2012 underwater inspection and the large area of general scour at Pier 1 and downstream of bridge. Additional investigation may include underwater imaging (Blueview) which is available through the MnDOT Bridge Office. (B) 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 18

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: County: MINNESOTA RIVER ELM WAY Metro Scott Bridge Description: The superstructure consists of four spans of multiple concrete beams supporting a reinforced concrete deck. The superstructure is supported by two concrete abutments and three concrete piers. The abutments are referred to as the west and east abutments, and the piers are numbered 1 through 3 from west to east. 2. INSPECTION DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Cory Stuber Garrett Owens 06/07/2017 Sunny, 75 F SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: Piers 1 through 3. General Shape: The piers consist of an oblong rectangular concrete shaft supporting a hammerhead pier cap on top of a rectangular footing founded on piles. Maximum Water Depth at Substructure(s) Inspected (feet): WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: The bottom of the pier cap at the downstream end of Pier The waterline was approximately 7.5 feet below 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 5 Y 48 06/2017 Page 4 of 18

5 Item 113: Scour Critical Bridge: Code: N 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 85 LF Scour 1 EA 1 Page 5 of 18

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge (CSAH No. 1 over the Minnesota River) was completed on June 7, The underwater inspection was conducted from a 14 foot boat. 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. The inspection utilized commercial dive equipment and techniques (SSA and/or SCUBA) 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 three reinforced concrete piers. According to the bridge inventory or design drawings, Piers 1 through 3 were supported by rectangular footings founded on piles. Inspection procedures followed FHWA guidance and MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for foundations. The routing 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 efforts. Page 6 of 18

7 Bridge ID: Minnesota Structure Inventory Report ELM WAY over MINNESOTA RIVER Date: 06/14/ 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. Crew Bridge Match ID (TIS) 0 Userkey 110 District 05 County Scott Route Sys 04 - CSAH Number 1 Functionally Obsolete City Sect., Twp., Range Latitude ' '' Control Section (TH Only) Status Longitude ' Custodian Owner 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: 4 Main Span Length Structure Length 01 - Beam Span Number of Spans APPR: 0 TOTAL: Deck Width (Out-to-Out) 56.0 Deck Material Wear Surf Type Wear Surf Install Year Wear Course/Fill Depth Deck Membrane Deck Rebars Roadway Area (Curb-to-Curb) Pier Foundation (Material/Type) 3 - FTG PILE 1 - CONC 3 - FTG PILE Underwater 60 Pinned Asbly. Spec. Feat. + W A T E R W A Y + Historic Status 5 - Not eligible 4 Drainage Area (sq. mi.) Structure Area (Out-to-Out) sq. + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Waterway Opening (sf.) Navigation Control Year Painted Posted Load sq. Traffic B R I D G E D A T A No flare + 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 Sidewalk Width 50A. Lt B. Rt Horizontal 0 - Not Required Curb Height 0.5 MI NW OF JCT CSAH 6 Level of Service 1 - MAINLINE Lt 1 - Concrete Cast-in-Place 1 - Monolithic Concrete Deck Rebars Install Year N - 25W Roadway Type 0 - None '' Reference Point 02 - County Highway Agency 02 - County Highway Agency Rt Unsound Paint % Painted Area Primer Type Finish Type 1 - Epoxy Coated Reinforcing + B R I D G E Vertical Roadway Name or Description Township BLAKELY ELM WAY Desc. Loc. BMU Agreement Year Built 2005 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key 2-2-way traffic Detour Length 12.0 mi. Lanes Route On Structure On - Off System 1 - ON Roadway Width Legislative District 25A Vertical Clearance Potential ABC 2 - N/A Max. Vert. Clear. Service On 5 - Highway-pedestrian Appr. Surface Width Service Under N - Not Applicable 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 Pier Protection Posting VEH: Rating Date 04/24/ MEETS STANDARDS 1 - MEETS STANDARDS 1 - MEETS STANDARDS D E P T H I N S P. + Y/N Freq Date 06/07/ 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 97.2 Routine Inspection Date 08/29/2016 Routine Inspection Frequency 24 Inspector Name + N B I Nav. Clr. () Nav. Vert. Lift Bridge Clear. () 1 - Not required Vert. 0.0 Horiz. MN Scour Code N - STBL - LIM SCOUR Year C A P A C I T Y R A T I N G S + Design Load Operating Rating Stuber, Cory A - Open C O N D I T I O N Deck 8 Unsound Superstructure 7 Deck % Underclearances Waterway Adequacy Approach Alignment 8 0 D I M E N S I O N S + NB-EB % SB-WB Substructure Channel 5 Culvert + N B I Structure Evaluation Deck Geometry HS 25 (OR GREATER) 2 - HS TRUCK Inventory Rating 2 - HS TRUCK 30.2 N N N SEMI: Overweight Permit Codes 7 N N 0 R A T I N G S + A P P R A I S A L R A T I N G S + + S A F E T Y F E A T U R E S + DBL: Page 7 of 18

8 06/19/2017 MINNESOTA BRIDGE INSPECTION REPORT BRIDGE ELM WAY OVER MINNESOTA RIVER County: City: Township: Scott Location: 0.5 MI NW OF JCT CSAH 6 Length: Route: 04 - CSAH 1 Ref. Pt.: Deck Width: BLAKELY Control Section: Rdwy. Area/ Pct. Unsnd: sq. / % Section: 8 Township: 113N Range: 25W Maint. Area: Paint Area/ Pct. Unsnd: sq. / % Span Type: 5 - Prestressed Concrete 2 - Local Agency Bridge Nbr.: Culvert: N/A List: Stringer/Multi-beam or Girder Postings: NBI Deck: 8 Super: 7 Sub: 7 Chan: 5 Culv: N Open, Posted, Closed: A - Open MN Scour Code: N - STBL - LIM SCOUR Appraisal Ratings - Approach: 8 Waterway: 4 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 97.2 ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Deck 06/14/ SF Underwater Notes: 2005 No cracking noted Cracking has started in all spans Cracking with efflorescence in all spans Ft, X 0.1 Ft. = 200 Sq Ft No Change. 05/24/ SF Wearing Surfaces Underwater 06/14/ SF /24/2017 Notes: Top of Concrete Deck with Epoxy Reinforcement Notes: - This quantity includes a 12 foot sidewalk the length of the bridge transverse cracks over pier 1,2 &3. pier 3 sidewalk has transverse cracks,ever 10 feet 2008 Longitudinal cracks east of pier Longitudinal cracks over pier No Change Lin. Ft. of unsealed cracks about inches. 550 x 0.1 = 55 Sq. FT in CS Prestressed Concrete Open Underwater Girder/Beam SF /14/ LF /24/ LF Notes: 2010 Very small hairline cracks from the top of the web diagonally downward on girders at both abutments, approx. 2.0 lin No Change One spall between pier 3 and abutment from tree damage. Girder 8, Span 1. On all girders, at the top, at each end, there is a crack diagonally downward from the top diaphragm bolt approximately 18 to 24 inches. Reinforced Concrete Pier Wall 06/14/ LF Underwater Notes: 2006 Pier 3 has a shrinkage crack near the east side of the centerline of the pier Pier 2 (Center Pier) Both sides, cracks under girder 6 and between girders Pier 3 Large Stain on west side No Change. 05/24/ LF Page 8 of 18

9 BRIDGE ELM WAY OVER MINNESOTA RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Abutment 06/14/ LF Underwater 05/24/ LF Notes: [2016] Migrator added 40 LF to abutment quantity to account for wing walls (CS1:40 CS2:0 CS3:0 CS4:0).Correction. wingwalls add an additional 127 LinFT West Abutment Parapet wall Hairline crack at north third point Both abutments, hairline cracks at 1/3 points No Change West abutment has a crack, 40 with efflorescence. Wing wall notes: No Change East abutment, South wingwall crack with efflorescence. Southwest wing wall has 2 cracks approx. 20 Lin ft by inches. Reinforced Concrete Pier Cap 06/14/ LF Underwater 05/24/ LF Notes: 2008 Pier 3 (East Pier) Both faces vertical cracks between girders 3-4 and 5-6, under girder 2 Pier 2 ( Center Pier) Both faces, 1 or 2 cracks under each girder. Also cracks in each concrete bearing seat. Pier 1 (West Pier) Add on bridge seats are not sealed. Concrete starting to crack No Change Efflorescence at pier 2 between girder 4 and 5. Dowel pins angled down stream No Change Under girders 1,2,3, and 7 diagonal cracks 4 by.004 inches at both ends and though both sides of cap. Strip Seal Expansion Joint 06/14/ LF Underwater 05/24/ LF Notes: Joints at end of each abutment No Change. All in CS North abutment, East side, leakage with efflorescence on underside, and above a 2 ft tear that needs repair. Pourable Joint Seal 06/14/ LF Underwater 05/24/ LF Notes: Over each pier Quantity change 52.9 feet each pier & 60 feet behind east parapet wall and 57 feet behind west parapet wall = No Change Joints behind parapet wall have been repaired with hot pour. In CS No Change. Elastomeric Bearing 06/14/ EA Underwater 05/24/ EA Notes: 2008 pier 1 (west pier) north facia girder, anchor bolts bent spalled concrete Both abutments No Change Abutment 2 west side, outside bearings angled outward, pier 3, span four,bearing angled toward center of river, bearing on pier 3, span three are plumb No Change. Fixed Bearing 06/14/ EA Underwater Notes: Pier 2 is fixed No Change. All in CS 1 05/24/ EA Page 9 of 18

10 BRIDGE ELM WAY OVER MINNESOTA RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Approach Slab 06/14/ SF Underwater 05/24/ SF Notes: [2016] Migrator assumed an approach slab length of 20FT and used the inventory quantity of 40FT for the width. Corrected to 1537 Sq Ft 2006 West approach, South side has settled approximately one inch. East approach, South side has settled approximately 1 3/4 inch. All settlement is next to the jersey barrier No Change East approach continues to settle East approach was repaired in Both approach panels have settled and need to be raised No change. Metal Bridge Railing 06/14/ LF Underwater Notes: Chain Link Fence Notes: - 8 foot coated (epoxy) on north side of bridge to protect sidewalk Lower rail buckled at both abutments. 12 Lin Ft at abutments in CS No Change. 05/24/ LF Steel Protective Coating Underwater 06/14/ SF /24/ SF Notes: Chain Link Fence Notes: [2016] Migrator assumed CS1 and a quantity of 999 SF. Corrected to 5248 sq The fence is in good shape. Reinforced Concrete Bridge Railing 06/14/ LF Underwater 05/24/ LF Notes: 2006 The South barrier has one shrinkage crack in each panel. The North barrier has two shrinkage cracks in each panel two different railings, one half Type F and the other Type F-SW. Northeast railing - gap at top of northeast railing is 3/4 inch greater than at the bottom of the joint. The "J" barrier running longitudinally along the approach slab has settled No Change. Critical Deficiencies or Safety Hazards 06/14/ EA Underwater Notes: None found. 05/24/ EA Concrete Shear Cracking 06/14/ EA Underwater 05/24/ EA Notes: 2010 Very small hairline cracks from the top of the web diagonally downward on girders at both abutments approx. 2.0 lin. See element 109 prestressed conc. girder No change Shear cracks on girders 1 thru 8 over piers 2 and ", 18" to 24" long. Scour 06/14/ EA Underwater 05/24/ EA Notes: See 2012 Underwater Report in SIMS No change. [2017] Underwater Inspection: A 10 foot radius scour depression 5 to 6 feet deep was observed around the perimeter of Pier 3. General scour observed around Pier 1, up to 12 feet deep adjacent to pier, and up to 18 feet deep downstream of bridge. Area was up to 40 feet wide and extended approximately 150 feet downstream. Other Bridge Signing 06/14/ EA Underwater Notes: PONTIS element inspection comments - Delineators are at the end of each guard rail No change. 05/24/ EA Page 10 of 18

11 BRIDGE ELM WAY OVER MINNESOTA RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Slopes & Slope Protection 06/14/ EA Underwater 05/24/ EA Notes: Completed in summer of Has 12 to 18 inch riprap due to comments and findings of the under water inspection report of 2012 we changed the east slope to condition 1 and the west slope to condition 2 although the report has west slope at condition 3 due to the erosion just up stream. We feel the upstream erosion is not yet critical to the condition of the bridge The trees and brush sprayed in summer. All protection in place. Upstream banks still eroding into river as channel has shifted, not yet critical to the bridge No change. Guardrail 06/14/ EA Underwater Notes: Guardrail on each corner of the bridge, No change. 05/24/ EA Deck & Approach Drainage 06/14/ EA Underwater Notes: Catch basins at end of approach panels in each corner No change. 05/24/ EA Sidewalk, Curb, & Median 06/14/ EA Underwater Notes: 2008 Northeast sidewalk panel along concrete approach panel has settlement No Change The sidewalk was repaired in No Change Northeast bituminous sidewalk has settle and helved upward A few shale spalls. 05/24/ EA Miscellaneous Items 06/14/ EA Underwater Notes: 2-4' dia. metal conduit system for frontier communications. Between girders 1 & 2. 05/24/ EA Protected Species 06/14/ EA Underwater 05/24/ EA Notes: [2016] Migrator determined the presence of swallows on this structure based on data in the inventory or comments in the general/miscellaneous notes Bat dropping's noted on the East abutment. Swallow nests at midspan, General Notes: PONTIS inspection comments - BRIDGE OPEN TO TRAFFIC IN NOV check deck for scaling - north gutter line 5 feet 5 feet both sides pier one. Inspectors: Grover, Lynch 2008 Used MN/DOT snooper to inspect bridge. Inspectors: Felt, Fiebelkorn, Lynch, Grover 2010 Flood fall of 2010, water to top of girders at west abutment. Inspectors: Lynch, Grover 2011 Used MN/DOT snooper to inspect bridge. Inspectors: Felt, Fiebelkorn, Lynch, Grover 2013 Swallow nests under span 3 between girder 7 and 8, used a MNDOT snooper a-62 to inspect the bridge. Inspectors: Felt, Grover, Fiebelkorn, Lynch, Gallagher 2014 Roadway approaches under water from sever summer storm Inspectors: Tom Lynch and Tom Gallagher 2016 The bridge needs to be swept. There is debris built up in front of piers. The inspection was done with MN DOT Snooper UB-30 Inspectors: Scoot Fiebelkorn, Tom Lynch, and Tom Gallagher 58. Deck NBI: 36A. Brdg Railings NBI: 36B. Transitions NBI: 36C. Appr Guardrail NBI: 36D. Appr Guardrail Terminal NBI: 59. Superstructure NBI: 2016 Non structural cracking in girders. Page 11 of 18

12 BRIDGE ELM WAY OVER MINNESOTA RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS Substructure NBI: 61. Channel NBI: 62. Culvert NBI: 71. Waterway Adeq NBI: 2016 Minor cracking in all three pier walls [2017] Underwater Inspection: Channel downgraded from 6 to 5 due to moderate degradation observed around Pier 1 and downstream of bridge Bridge had occasional overtopping of roadway approaches with significant traffic delays 72. Appr Roadway Alignment NBI: Inspector's Signature Reviewer's Signature Page 12 of 18

13 Pictures Photo 1 - North Elevation, Looking South. Photo 2 - South Elevation, Looking North. Page 13 of 18

14 Pictures Photo 3 - West Shoreline, Looking Southwest. Photo 4 - Pier 1, Looking West. Page 14 of 18

15 Pictures Photo 5 - Pier 2, Looking Southeast. Photo 6 - Pier 3, Looking East. Page 15 of 18

16 Pictures Photo 7 - East Shoreline, Looking Southeast. Photo 8 - Typical Concrete Condition at the Waterline, Looking Southeast. Page 16 of 18

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