2017 UNDERWATER BRIDGE INSPECTION REPORT. TWP 332 over ROOT RIVER. Date of Inspection: Equipment Used: 10/22/2016. Town or Township Highway Agency

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1 2017 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # L4870 TWP 332 over ROOT RIVER DISTRICT: District 6 COUNTY: Fillmore CITY/TOWNSHIP: JORDAN STATE: Minnesota Date of Inspection: Equipment Used: 10/22/2016 Owner: Town or Township Highway Agency Inspected By: Stromberg, Dan Report Written By: Dan Stromberg 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 11 BRIDGE L4870 UNDERWATER INSPECTION DRAWINGS

3 UNDERWATER INSPECTION REPORT SUMMARY The substructure units inspected at Bridge L4870, the North and South Abutments, were found to be in satisfactory to fair condition with no defects of notable structural significance below water. Random areas of section loss were observed along the submerged abutment walls with average penetrations of 6 to 12 inches, and in some instances, with exposed and corroded reinforcing steel. A section of the concrete facing was undermined/undercut along the South Abutment exposing the underlying original masonry wall, which was generally in good condition. Additionally, a section of the concrete facing was undermined/undercut along the North Abutment, but the face of the original masonry abutment was not encountered. Overall, the channel bottom configuration appeared to be in stable condition, with no notable scour depressions observed and just some minor general aggradation of bottom material since the last inspection. INSPECTION FINDINGS 1. The channel bottom at both abutments consisted of riprap allowing no probe rod penetration. Along the face of the South Abutment there was up to 6 inches of soft silty infill. 2. An area of poor consolidation, 3 feet wide, was observed on the east corner of the South Abutment extending from 6 inches below to 1 1/2" inches above the waterline with 5 inches of maximum penetration. 3. A 6 inch band of poorly consolidated concrete was observed at the waterline extending from the downstream 1/4 point to the east wingwall of the South Abutment. 4. The upstream half (from 12 feet downstream of the upstream corner to the upstream corner) of the South Abutment concrete wall facing exhibited undermining that was 1.5 feet high with up to 1.5 feet of penetration, which exposed the underlying masonry (original construction). Random areas of section loss were observed on the submerged portion of the South Abutment facing with average penetrations of 6 inches exposing heavily corroded vertical reinforcing steel near the center of the abutment. 5. A concrete ledge was located at 1.4 feet below the waterline at the South Abutment and 1.2 feet below the waterline at the North Abutment. The concrete was irregular with up to 12 inch deep irregularities. The North Abutment step was undercut toward the channel bottom up to 18 inches. The face of the original masonry abutment was not encountered along the undercut. 6. Random areas of section loss were observed on the submerged portion of the North Abutment with average penetrations of 12 inches and no exposed reinforcing steel detected. 7. A formed steel angle was exposed due to an area of section loss, up to 1 foot wide and 4 inches deep, on the west corner of the South Abutment extending from 4 feet above to 1.5 foot below the waterline. RECOMMENDATIONS (A) 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 17

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: L4870 ROOT RIVER TWP 332 District 6 County: Fillmore Bridge Description: The superstructure consists of a single span, multiple steel stringer structure supporting a timber deck. The superstructure is supported by two masonry stone/concrete faced (encased) abutments. No design drawings or plans were available for this bridge; therefore, the type of substructure foundation is not known. 2. INSPECTION DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Daniel G. Stromberg Daniel G. Stromberg 10/22/2016 Sunny, 65 F 3 feet 0.5 ft/sec 3. SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: The North and South Abutments. General Shape: The abutments consist of a masonry breastwall covered by a concrete facing (encasement) with two adjoining skewed wingwalls. Maximum Water Depth at Substructure(s) Inspected (feet): 5.0 feet 4. WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: The bottom of the outermost steel stringer on the east side of the North Abutment feet The waterline was located approximately 8.9 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: 5 6 Y 48 10/2016 Page 4 of 17

5 Item 113: Scour Critical Bridge: Code: R 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 215 Reinforced Concrete Abutment 73 LF Scour 1 EA 1 Page 5 of 17

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge L4870 (TWP 332 over Root River) was completed on October 22, The underwater inspection was conducted from the 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 (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 two masonry stone/concrete faced (encased) abutments. No design drawings or plans were available for this bridge; therefore, the type of substructure foundation is not known. 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 17

7 Minnesota Structure Inventory Report Bridge ID: L4870 TWP 332 over ROOT RIVER Date: 01/17/ 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 63 District 06 County Fillmore Route Sys 08 - TWNS Number 332 Functionally Obsolete City Sect., Twp., Range Main Span Type 3 - Steel 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: 1 Main Span Length Structure Length 01 - Beam Span Number of Spans APPR: 0 TOTAL: 52.4 ft. Deck Width (Out-to-Out) 16.0 ft. 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) 963 sq. ft. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height 0.5 MI S OF JCT CSAH 5 Level of Service 1 - MAINLINE N - 12W Roadway Type Latitude ' '' Control Section (TH Only) Status Longitude ' 9.38 '' Reference Point Custodian Owner 03 - Town or Township Highway 03 - Town or Township Highway Lt 8 - Wood or Timber 8 - Gravel 0.08 ft. 0 - None N - Not Applicable (no deck) + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status 0 - UNKNOWN N - N/A N - N/A Underwater 60 Pinned Asbly. Spec. Feat ft. Navigation Control Year Painted 883 sq. ft. Traffic ft. 50B. Rt ft. Rt Painted Area Posted Load B R I D G E D A T A No flare 5 - Not eligible + P A I N T + ft. Bridge Railing 0 - SUBSTANDARD ft. N - No parallel structure GR Transition Appr. Guardrail GR Termini 1 - CONC Frac. Critical 0 - Not Required 0 - Not Required ft. Horizontal 1 - Object Markers 0.42 ft. Vertical Unsound Paint % Roadway Name or Description Township JORDAN TWNS 332 Desc. Loc. BMU Agreement Year Built 1938 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key N - Not Applicable + I N Drainage Area (sq. mi.) + W A T E R W A Y + Waterway Opening (sf.) 663 Pier Protection Posting VEH: Rating Date 02/01/2011 N - NOT REQUIRED N - NOT REQUIRED N - NOT REQUIRED D E P T H I N S P. + Y/N Freq Date 10/22/ No nav. control on Rail Type Lt 32 Rt 32 A N - N/A B N - N/A C N - N/A sq. ft. Nav. Clr. (ft.) Nav. Vert. Lift Bridge Clear. (ft.) Primer Type 0 - Other - non 3309 MN Scour Code R - CRIT - Year 2009 Finish Type L - Other (Unknown) MONITOR + C A P A C I T Y R A T I N G S + + B R I D G E 3 - One lane bridge for 2-way traffic Detour Length 5.0 mi. Lanes Route On Structure On - Off System 0 - OFF Roadway Width ft. Legislative District 27B Vertical Clearance ft. Potential ABC 2 - N/A Max. Vert. Clear. ft. Service On 1 - Highway Appr. Surface Width Service Under 0 - NO PLAN 12/1/ S T R U C T U R E + HCADT Functional Class If Divided + R D W Y Horizontal Clear. Lateral Clearance ON 1 UNDER ADT 5 - Waterway Bridge Roadway Width YEAR 1973 ADTT 09 - Rural - Local 20.0 ft. S I G N S + ft. ft. ft. ft. Structurally Deficient Sufficiency Rating 64.6 Routine Inspection Date 04/06/2015 Routine Inspection Frequency 24 Inspector Name + N B I Design Load Operating Rating Stromberg, Dan A - Open C O N D I T I O N Deck 5 Unsound Superstructure 5 Deck % Underclearances Waterway Adequacy 8 ft. ft. Approach Alignment 3 ft. 0 D I M E N S I O N S + NB-EB % SB-WB Substructure Channel 6 Culvert + N B I Structure Evaluation 5 Deck Geometry 6 SEMI: Overweight Permit Codes _ Vert. 0.0 Horiz. 0 - Other/Unknown 2 - HS TRUCK R A T I N G S + Inventory Rating 2 - HS TRUCK N Y 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 17

8 01/30/2017 MINNESOTA BRIDGE INSPECTION REPORT BRIDGE L4870 TWP 332 OVER ROOT RIVER County: City: Township: Fillmore Location: 0.5 MI S OF JCT CSAH 5 Route: 08 - TWNS 332 Ref. Pt.: JORDAN Control Section: Section: 24 Township: 104N Range: 12W Maint. Area: Span Type: 3 - Steel 2 - Stringer/Multi-beam or Local Agency Bridge Nbr.: List: Girder NBI Deck: 5 Super: 5 Sub: 5 Chan: 6 Culv: N Open, Posted, Closed: A - Open MN Scour Code: R - CRIT - MONITOR Appraisal Ratings - Approach: 3 Waterway: 8 Required Bridge Signs - Load Posting: 0 - Not Required Traffic: 0 - Not Required Horizntal: 1 - Object Markers Vertical: N - Not Applicable Length: 60.2 ft. Deck Width: 16.0 ft. Rdwy. Area/ Pct. Unsnd: 883 sq. ft. / % Paint Area/ Pct. Unsnd: sq. ft. / % Culvert: N/A Postings: Unofficial Structurally Deficient N Unofficial Functionally Obsolete Y Unofficial Sufficiency Rating 64.6 ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Timber Deck 01/17/ SF Underwater 11/21/ SF Notes: [2003] - there is minor splitting, cracking, and crushing of the timber throughout the deck the top of the deck can not be viewed. [2011] - moderate deterioration throughout, 12 plank at approx. 12' long has moderate rot, splitting and decay. [2013] - removed gravel in several locations revealing moderate decay,rot and splitting present. [2015] - moderate splitting, decay and cracking throughout based off of 25% of deck revealed. Steel Open Girder/Beam 01/17/ LF Underwater 11/21/ LF Notes: [2005] - all beams are pitted along the bottom flanges and laminated along the top flanges. the West facia beam is slightly out of alignment. [2007] - There is extensive flaking rust along the upper flange of all beams. The bottom flange of all beams are pitted with prevalent surface corrosion the 1st beam from the west is out of alignment. [2011] - no change 2007/2009. [2013] - no change high water would not allow good evaluation. [2015] - all beams have severe corrosion and extensive flaking rust along the upper flange of all beams. there is 100% paint loss. Able to view all beams from north abutment Steel Protective Coating Underwater 01/17/ SF /21/2016 Notes: [2016] Migrator assumed quantity of 999 SF and estimated the condition states. 999 SF Reinforced Concrete Abutment 01/17/ LF Underwater 11/21/ LF Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:0 CS2:40 CS3:0 CS4:0). [2003] - both abutments have minor cracking and spalling. [2007] - There is moderate deterioration throughout both abutments. [2011] - no change [2013] - There is a large spall at the NE corner and a large structure crack at the NW corner. [2015] - no change from 2013 notes. Wingwall notes: [2003] - all wings have minor cracking and spalling. [2011] - SE wing has large waterline, remainder minor cracks & spalls. [2013] - no notes. [2015] - minor cracks and spalls throughout. the WE wing has a large spall at waterline. Page 8 of 17

9 BRIDGE L4870 TWP 332 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Metal Bridge Railing 01/17/ LF Underwater 11/21/ LF Notes: [2005] - there is minor surface corrosion. there is minor impact damage at the NW corner. [2007] - Surface corrosion is prevalent throughout both railings the NW 7' of rail has impact damage with corner connections severed. [2011] - no change 2007/2009. [2012] - rail noted above in 2009 has been repaired. [2013] - no change % paint failure. [2015] - moderate impact damage to the north 7' of west rail. surface corrosion is prevalent throughout both railings Steel Protective Coating Underwater 01/17/ SF /21/2016 Notes: [2016] Migrator assumed CS1 and a quantity of 999 SF. 999 SF Critical Deficiencies or Safety Hazards 01/17/ EA Underwater Notes: [2013] - no finding [2015] - no findings. 11/21/ EA Gravel Approach Roadway 01/17/ EA Underwater 11/21/ EA Notes: [2005] - moderate rutting and potholes on both approaches. [2007] - The approaches are in good condition. [2011] - no change [2012] - no notes [2013] - both approaches have moderate rutting. [2015] - moderate rutting throughout both approaches. Steel Section Loss 01/17/ EA Underwater Notes: [2005] - there is measurable loss on all beams. [2011] - approx. 5% section loss all upper flange. [2013] - no notes. [2015] - <5% section loss on upper flanges. 11/21/ EA Scour 01/17/ EA Underwater 11/21/ EA Notes: [2009] R - Scour critical. Monitoring required. [2013] - high water would not allow probing of abutments. [2015] - probing revealed no scour at north abutment. could not probe south abutment due too water depth. Other Bridge Signing 01/17/ EA Underwater 11/21/ EA Notes: Signs Required: Horizontal Clearance [2005] - the West delineators are missing. the East delineators are damaged. [2011] - no change [2013] - no change [2015] - west delineators are missing. east have extensive deterioration. Slopes & Slope Protection 01/17/ EA Underwater Notes: Use this element to rate the condition of slopes and slope protection. 11/21/ EA Deck & Approach Drainage 01/17/ EA Underwater Notes: Use this element to rate the condition, function, and adequacy of the drainage system. 11/21/ EA Page 9 of 17

10 BRIDGE L4870 TWP 332 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Sidewalk, Curb, & Median 01/17/ EA Underwater Notes: [2003] - both curbs have minor superficial cracks. [2011] - minor deterioration both curbs. [2013] - minor deterioration both curbs. [2015] - minor deterioration throughout. 11/21/ EA Protected Species 01/17/ EA Underwater Notes: Use this element to track the presence of protected species living on this structure. 11/21/ EA General Notes: 58. Deck NBI: [2001] DECK, WEAR STRIPS AND CURBS HAVE BEEN REPLACED. [2003] - inspected by TM, DS - slope protection has been replaced. banks have been covered with riprap. [2005] - inspected by TM, DS. There is possible scour under the bridge. there is minor lateral streambed movement towards the NW wing. [2007] - inspected by DS. There is moderate bank erosion throughout the channel. There is possible scour along the South abutment. [2009] - inspected by DS, JT - there is moderate upstream and downstream bank erosion. there is a large tree growing by the NE wing. [2011] - no change [2012] - Special inspection performed by HDR Engineering on 10/19/2010 for the purpose of load rating the structure. No load posting recommended! [2013] - Approx. 6 1/2' of freeboard during inspection. There is minor bank erosion upstream and downstream. the channel has migrated and eroded NW bank due too alignment of channel. [2015] - inspected by DS - minor bank erosion upstream and downstream. see element 31 36A. Brdg Railings NBI: 36B. Transitions NBI: 36C. Appr Guardrail NBI: 36D. Appr Guardrail Terminal NBI: 59. Superstructure NBI: 60. Substructure NBI: see element 107 notes. see element 215 notes. 61. Channel NBI: 62. Culvert NBI: 71. Waterway Adeq NBI: 72. Appr Roadway Alignment NBI: Basically intolerable requiring high priority Inspector's Signature Reviewer's Signature Page 10 of 17

11 Pictures Photo 1 - Overall View of Upstream Fascia, Looking Northeast Photo 2 - Overall View of Downstream Fascia, Looking Southwest Page 11 of 17

12 Pictures Photo 3 - View of North Abutment, Looking Northeast Photo 4 - View of North Abutment, Looking Northwest Page 12 of 17

13 Pictures Photo 5 - View of South Abutment, Looking Southwest Photo 6 - View of South Abutment, Looking Southeast Page 13 of 17

14 Pictures Photo 7 - Section Loss and Undercutting at Concrete Ledge at North Abutment, Looking East Photo 8 - Poor Consolidation at Southeast Corner of South Abutment, Looking Southwest Page 14 of 17

15 Pictures Photo 9 - Section Loss at South Abutment Exposing Steel Angle, Looking Southeast Page 15 of 17

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