2017 UNDERWATER BRIDGE INSPECTION REPORT. CSAH 25 over ROOT RIVER. Date of Inspection: Equipment Used: 10/21/2016. County Highway Agency

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1 2017 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # CSAH 25 over ROOT RIVER DISTRICT: District 6 COUNTY: Fillmore CITY/TOWNSHIP: Peterson STATE: Minnesota Date of Inspection: Equipment Used: 10/21/2016 Owner: County 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 13 BRIDGE UNDERWATER INSPECTION DRAWINGS

3 UNDERWATER INSPECTION REPORT SUMMARY The substructure unit inspected at Bridge No , Pier 2, was found to be generally in satisfactory condition below water, although with significant foundation exposure/undermining. A scour depression approximately 3 feet deep was detected at the upstream nose of Pier 2. The pier footing was exposed around the entire perimeter with undermining and nine exposed timber piles noted across the upstream and east sides of the pier. Moderate to heavy timber debris accumulation was observed along the west side of Pier 2 extending from the pier to the shore. The channel bottom across most of the waterway appeared stable with no appreciable changes since the previous inspection except at the pier. The extent of foundation exposure has increased at Pier 2 from what was noted during the 2012 inspection and height of undermining has significantly increased from a maximum of 4 inches in 2012 to a maximum of 2 feet currently. It should be noted that Pier 3 is normally in the dry and part of the above water inspection, and was only partially located in the water during this inspection due to temporarily elevated water levels. INSPECTION FINDINGS 1. A light accumulation of timber debris consisting of 2 inch diameter and smaller branches was observed at the upstream nose of Pier 2 at waterline. 2. The channel bottom material around most of Pier 2 consisted of fine sandy gravel allowing up to 2 inches of maximum probe rod penetration. 3. Two horizontal impact related voids were observed on the upstream nose of Pier 2 above the waterline, each measuring 2- foot-long by 1-inch-wide with 1/2 inch of penetration and exposed aggregate. 4. Light scaling of the pier concrete was observed from the top of the footing to 4 feet above the waterline, with 1/4 inch maximum penetration. 5. The footing was exposed along the entire perimeter of Pier 2. Undermining was observed along the east face of the pier from the center of the upstream nose to the midpoint of the east face, with a maximum height of undermining of 2 feet located at the southeast corner of the footing. Horizontal penetration of the undermining (generally up to 5 feet) encountered two rows (9 total) of exposed timber piles. Full footing height of 3.5 feet was exposed at the midpoint of the east face of the pier with no undermining observed. 6. A 5-foot-radius, 3-foot-deep scour depression was observed at the upstream end of Pier The channel bottom at the downstream end of Pier 2 consisted of sandy infilling allowing 3 inch probe rod penetration. 8. A moderate accumulation of timber debris, with pieces up to 1.5 feet in diameter, was observed within the scour depression at the upstream end and along the east face of the pier, extending from the channel bottom up 3 feet. 9. A moderate to heavy accumulation of timber debris, with pieces 2 foot diameter and smaller and with a large tree and rootball, extended from the channel bottom to 6 feet above the waterline along the west face of Pier 2 from the downstream nose to the upstream quarter-point and approximately 25 feet out from the face of the pier to the shoreline. 10. Minor accumulation of timber debris, 6 inches diameter and smaller, at the upstream end of Pier 3 extended from the channel bottom to 2 feet above the waterline. RECOMMENDATIONS (A) Monitor the scour depression and footing exposure at Pier 2 during future inspections. If these conditions progress, scour countermeasures may need to be considered. (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 19

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: ROOT RIVER CSAH 25 District 6 County: Fillmore Bridge Description: The bridge superstructure is a four span, multiple steel girder bridge. The superstructure is supported by two reinforced concrete abutments and three reinforced concrete piers. The pier and abutment footings are supported by timber piles. The piers are numbered 1 through 3 starting from the west. 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 10/21/2016 Sunny, 65 F 5.0 feet 1.5 ft/sec 3. SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: Pier 2 General Shape: The piers consists of a rectangular concrete shaft with rounded ends supporting a hammerhead pier cap and are founded on a rectangular pile supported footing. Maximum Water Depth at Substructure(s) Inspected (feet): 7.5 feet 4. WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: The top of the pier cap at the south end of Pier feet The waterline was located approximately 19.4 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: 6 6 Y 48 10/2016 Page 4 of 19

5 Item 113: Scour Critical Bridge: Code: O 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 21 LF Reinforced Concrete Footing 23 LF Scour 1 EA 1 Page 5 of 19

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge (CSAH 25 over Root River) was completed on October 21, 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 element inspected consisted of one reinforced concrete pier (Pier 2). According to design drawings, the inspected substructure unit is founded on a rectangular reinforced concrete footing supported by timber 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 19

7 Bridge ID: Minnesota Structure Inventory Report CSAH 25 over ROOT RIVER Date: 01/18/ 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 04 - CSAH Number 25 Functionally Obsolete City Sect., Twp., Range Latitude ' '' Control Section (TH Only) Status Custodian Owner Main Span Type 4 - Steel Continuous 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: ft. + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status Deck Width (Out-to-Out) 34.1 ft. Year Painted 1975 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) sq. ft. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height Peterson 0.1 MI W OF JCT TH 16 Level of Service 1 - MAINLINE N - 08W Roadway Type Lt 1 - Concrete Cast-in-Place 1 - Monolithic Concrete 0.00 ft. 0 - None B R I D G E D A T A No flare 4 - Bolted 3 - FTG PILE 1 - CONC 3 - FTG PILE 5 - Not eligible + P A I N T + ft. Bridge Railing 0 - SUBSTANDARD Appr. Guardrail GR Termini Underwater 60 Pinned Asbly. Spec. Feat ft. Navigation Control sq. ft. Traffic ft. 50B. Rt ft. Rt Painted Area Posted Load ft. N - No parallel structure GR Transition 1 - CONC Frac. Critical 0 - Not Required 0 - Not Required ft. Horizontal 1 - Object Markers 0.75 ft. Vertical Unsound Paint % 0 - None + B R I D G E 2-2-way traffic Longitude ' '' Reference Point County Highway Agency 02 - County Highway Agency Roadway Name or Description Township CSAH 25 Desc. Loc. BMU Agreement Year Built 1963 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 15.0 mi. Lanes Route On Structure On - Off System 0 - OFF Roadway Width ft. Legislative District 31B Vertical Clearance ft. Potential ABC 2 - N/A Max. Vert. Clear. ft. Service On 1 - Highway Appr. Surface Width Service Under 3 - COUNTY 11/1/ 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.) 7640 Pier Protection Posting VEH: Rating Date 03/31/2014 N - NOT REQUIRED N - NOT REQUIRED N - NOT REQUIRED D E P T H I N S P. + Y/N Freq Date 10/21/ No nav. control on Rail Type Lt 37 Rt 37 A N - N/A B N - N/A C N - N/A sq. ft. ADTT 08 - Rural - Minor Collector 42.0 ft. Nav. Clr. (ft.) Nav. Vert. Lift Bridge Clear. (ft.) Vert. 0.0 Horiz. Primer Type 1 - Lead - non 3309 MN Scour Code O - STBL - ACT Year 1995 Finish Type F - - Phenolic Resin Alum REQD + C A P A C I T Y R A T I N G S + S I G N S + ft. ft. ft. ft. Structurally Deficient Sufficiency Rating 93.2 Routine Inspection Date 03/30/2016 Routine Inspection Frequency 24 Inspector Name + N B I Design Load 4 - H 20 Operating Rating Stromberg, Dan A - Open C O N D I T I O N Deck 5 Unsound Superstructure 6 Deck % Underclearances Waterway Adequacy 8 ft. ft. Approach Alignment 8 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 6 Deck Geometry HS TRUCK Inventory Rating 2 - HS TRUCK 20.0 N N N SEMI: Overweight Permit Codes 6 N 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 19

8 01/31/2017 MINNESOTA BRIDGE INSPECTION REPORT BRIDGE CSAH 25 OVER ROOT RIVER County: City: Township: Fillmore Location: 0.1 MI W OF JCT TH 16 Peterson Route: 04 - CSAH 25 Ref. Pt.: Control Section: Section: 29 Township: 104N Range: 08W Maint. Area: Span Type: 4 - Steel Continuous 2 - Local Agency Bridge Nbr.: List: Stringer/Multi-beam or Girder NBI Deck: 5 Super: 6 Sub: 6 Chan: 6 Culv: N Open, Posted, Closed: A - Open MN Scour Code: O - STBL - ACT REQD Appraisal Ratings - Approach: 8 Waterway: 8 Required Bridge Signs - Load Posting: 0 - Not Required Traffic: 0 - Not Required Horizntal: 1 - Object Markers Vertical: N - Not Applicable Length: ft. Deck Width: 34.1 ft. Rdwy. Area/ Pct. Unsnd: sq. ft. / % Paint Area/ Pct. Unsnd: sq. ft. / % Culvert: N/A Postings: Unofficial Structurally Deficient N Unofficial Functionally Obsolete N Unofficial Sufficiency Rating 93.2 ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Deck 01/18/ SF Underwater 11/15/ SF Notes: there are cracks throughout the soffit. (25-50%) there is moderate cracking with efflorescence and staining throughout the underside approx. 10% - 25% deck cracking! Efflorescence at all poured deck joint locations. [2013] - several areas of underdeck delamination in each span. [2014] - no change from 2012 except transverse cracks are approximately every 2'. [2016] - several full length transverse cracks with efflorescence of moderate size throughout. from the west span #1=18, S2=15, S3=12 & S4=12. there are 7 full length transverse cracks with water saturation. there is minor map cracking from east abutment to 6' in full width. there is minor tranverse cracks throughout. there are 29 transverse cracks with efflorescense on the overhang. there is a deep spall in east span between beam 1 & 2 from the south that measures 6sf and another between beam 2 & 3 that measurres 2 sf Wearing Surfaces Underwater 01/18/ SF /15/ SF Notes: Top of Concrete Deck with Uncoated Rebar Notes: deck has been patched (10-25%) sounding test revealed 246 sf of delaminations and patches = < 10% chain drag revealed 674' of delamination and existing deck patches. See element 358. [2013] - several open deck patches that have failed. [2014] - chain dragging revealed 840 sf of delamination. Several patch locations show deterioration and should be replaced. [2016] - there is approx. 47 sf of deep spall throughout. there are 592 sf of bituminous patches of which most have reached there life. there is approx. 436 sf of unsealed full width transverse cracks of moderate size. the remainder of deck has minor scale throughout. Steel Open Girder/Beam 01/18/ LF Underwater 11/15/ LF Notes: rusting is occuring at the drain locations. there is some peeling paint surface corrosion 1' of end of all W. abut. / 40' along lower flange of S. Beam (#1), E. abut. beam 2 (2') at mid-point and beam 3-1' at uper flange mid span Surface corrossion 1' of end of all beams west abut. At east abutment from the south Beam 1 & 4 have 1' of flaking rust at the ends. East span from south beam 1 has 25' of surface corrossion with peeling paint lower flange. Approx. 2' of surface corrossion with peeling paint below each deck drain outlet. (28 drains outlets). [2013] - the east end of the south fascia beam on the south face has peeling paint and rust staining. [2014] - no change from Painted Steel Beam End Notes: [2013] - All beam ends have peeling active rust and some pack rust approximately 8" - 12" out from the girder ends. [2014] - no change from [2016] - no change from 2014 notes Steel Protective Coating Underwater 01/18/ SF /15/ SF Notes: [2016] - the south beam at lower flange full width has minor corrossion <3% (approx 200 sf). there is 2' of paint loss on the end of all beams with minor corrossion = 48 sf. there is an additional 2' of corrossion on beam 2 midpoint and 1' on beam 3. there is approx. 5% throughout all beams with peeling paint. Page 8 of 19

9 BRIDGE CSAH 25 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Pier Wall 01/18/ LF Underwater Notes: there are minor cracks in all piers no notes. [2014] - no notes - high water today and viewed from bank. [2016] - minor vertical cracks in both pier walls. 11/15/ LF Reinforced Concrete Abutment 01/18/ LF Underwater 11/15/ LF Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:0 CS2:40 CS3:0 CS4:0) there are vertical cracks in the south abutment. there are horizontal cracks in the north abutment no change [2013] - Previous notes should be changed to show bridge as East-West. The east abutment has a 6"x2' spall on the top face of the abutment between girders 1-2. [2014] - there are vertical cracks in the east abutment and horizontal cracks in the west abutment. Cracks are minor in size. Wingwall notes: the southand NW wings have spalls with exposed reinforcement the NE wing also has a small spall no notes. [2014] - minor deterioration in all wings - no change from [2016] - both abutments have minor size vertical and horizontal cracks minor in size. the back wall at both abutments have several moderate size vertical cracks. the SE wing has a minor spall with exposed reinforcement. Reinforced Concrete Pier Cap 01/18/ LF Underwater Notes: there are small spalls on the center cap minor cracks and spall at center cap upstream side. [2014] - no change from [2016] - no change from 2012 notes. 11/15/ LF Strip Seal Expansion Joint 01/18/ LF Underwater 11/15/ LF Notes: assembly joint were replaced with strip joints in joints filled with debris but functioning both joints are filled with debris and not causing any problems. [2013] - joints are full of debris, but there is no sign of leakage on the abutments. [2014] - both joints are filled with sand but are in good shape. [2016] - Pourable Joint Seal 01/18/ LF Underwater Notes: there is moderate deterioration to the joint seals part of sealant missing due to deck patching in these areas. Minor joint leaking. [2014] - no change from [2016] - minor deterioration throughout all joints - no change 2012 notes. 11/15/ LF Elastomeric Bearing 01/18/ EA Underwater Notes: these were added in 2005 at both abutments no change [2014] - bearings all look positioned properly. [2016] - good condition. 11/15/ EA Movable Bearing 01/18/ EA Underwater Notes: abutment bearings replaced with elastomeric in no notes. [2014] - good condition. [2016] - good condition. 11/15/ EA Page 9 of 19

10 BRIDGE CSAH 25 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Fixed Bearing 01/18/ EA Underwater Notes: no notes. [2014] - good condition. [2016] - no problems. 11/15/ EA Metal Bridge Railing 01/18/ LF Underwater 11/15/ LF Notes: there is minor corrosion at all connectors rd post west of east pole is missing the lower bracket No change Minor surface corrossion at all connection points. [2014] - no change from except there is minor corrossion at both light bases. [2016] - minor corrossion at all connection points and bottom of base next to concrete walk Steel Protective Coating Underwater 01/18/ SF Notes: [2016] - minor deterioration throughout. 11/15/ SF Critical Deficiencies or Safety Hazards 01/18/ EA Underwater Notes: no notes. [2013] - no critical finding noted. [2014] - no finding [2016] - no finding. 11/15/ EA Concrete Decks - Cracking & Sealing 01/18/ LF Underwater Notes: there is moderate sized & density cracks throughout the deck wearing surface has unsealed cracks of moderate size and density. [2014] - no change from [2016] - there is approx. 436' lf of cracks of moderate size. 11/15/ LF Bituminous Approach Roadway 01/18/ EA Underwater 11/15/ EA Notes: both approaches are cracked and settled moderate deterioration both approaches. Slight settlement both approaches. [2013] - both approaches have large areas of patching with settlement. Large unsealed cracks. [2014] - There is extensive cracking and deterioratin at west approach. The west approach has settled and has minor impact to the bridge. The east approach is new is 2013 when MNDOT did there TH 16 project. [2016] - no change from 2012 notes. Secondary Members (Superstructure) 01/18/ EA Underwater Notes: [2013] - no notes. [2014] - no notes. [2016] - minor deterioration. 11/15/ EA Concrete Shear Cracking 01/18/ EA Underwater 11/15/ EA Notes: Use this element to monitor the presence of shear cracking on concrete elements. Pay particular attention to the concrete pier caps. [2016] -no notes. Page 10 of 19

11 BRIDGE CSAH 25 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Scour 01/18/ EA Underwater 11/15/ EA Notes: O - Stable for scour. Additional action required there is possible scouring at the center pier. footing is exposed there is minor scour at pier #2. (see underwater report) nd pier from west has possible scour. Probing revealed 4' degradation on exposed foting at inlet side and along east side of footing! [2013] - high water at time of inspection. [2014] - could not probe due to high water. [2016] - could not probe 2nd pier from west due too high water. possible scour in this area. Other Bridge Signing 01/18/ EA Underwater Notes: no notes [2014] - good condition [2016] - good condition. 11/15/ EA Slopes & Slope Protection 01/18/ EA Underwater 11/15/ EA Notes: [2016] - moderate slope erosion occuring under far east span and south side of west span. Deck & Approach Drainage 01/18/ EA Underwater Notes: Use this element to rate the condition, function, and adequacy of the drainage system. [2016] - evenly graded. 11/15/ EA Sidewalk, Curb, & Median 01/18/ EA Underwater 11/15/ EA Notes: there is minor deterioration throughout spalls at all downspouts no change [2014] - minor deterioration throughout - There is a bolt sticking up in the slide plate at the NE corner. Field measured the expansion joint at SE corner of curb from slide plate to curb approach = 2". Measurement written on steel plate. [2016] - no change from 2014 notes. Protected Species 01/18/ EA Underwater 11/15/ 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. [2016] - cliff hanger nests present. General Notes: STRUCTURE PHOTOS TAKEN 3/20/ inspected by TM, DS - abutment bearings were replaced in 2005 by Mn/DOT forces. there is a large tree caught on the center pier. the footing on the center pier are exposed with approx. 4' of scour on the south side of the footing. a monitoring plan for scour should be established. swallow nests are present inspected by TM, DS, JT inspected by TM, DS, JT - large branch caught on center pier Large branch on bank SW corner. [2013] - The bridge was inspected by Gary Waletzki and Aaron Forthun with a snooper in April of Spans numbered from the west, girders were numbered from the south. [2014] - Run off below bridge from surface SW corner is causing extensive bank erosion. At mid span on the south side the conduit suspended from bridge is heavily damaged exposing utility cable. Notified telephone company. [2016] - inspected by DS,CA 58. Deck NBI: [2016] - see element 12 36A. Brdg Railings NBI: 36B. Transitions NBI: 36C. Appr Guardrail NBI: 36D. Appr Guardrail Terminal NBI: 59. Superstructure NBI: [2016] - see element 12 & 330. Page 11 of 19

12 BRIDGE CSAH 25 OVER ROOT 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: 2016] - see element 215. [2016] - runn off below bridge from surface SW corner is causing extensive bank erosion. at mid span on the south side the conduit suspended from bridge is heavily damaged exposing utility cable. 71. Waterway Adeq NBI: 72. Appr Roadway Alignment NBI: Inspector's Signature Reviewer's Signature Page 12 of 19

13 Pictures Photo 1 - Overall View of Upstream Fascia, Looking Northwest Photo 2 - Overall View of Downstream Fascia, Looking Southwest Page 13 of 19

14 Pictures Photo 3 - View of Pier 2, Looking Northwest Photo 4 - View of Pier 3, Looking Northeast Page 14 of 19

15 Pictures Photo 5 - View of Timber Debris Accumulation at Pier 2, Looking South Photo 6 - View of Undermining near Southeast Corner of Pier 2, Looking North Page 15 of 19

16 Pictures Photo 7 - View of Undermining and Exposed Timber Pile, Looking North Photo 8 - Typical Timber Pile Condition within Undermining, Looking North Page 16 of 19

17 Pictures Photo 9 - View of Timber Debris at Undermining near Upstream Nose of Pier 2, Looking North Page 17 of 19

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