BRIDGE # CSAH 12 over CROW RIVER...NBR ELEMENT NAME INSP. DATE QUANTITY QTY CS 1 QTY CS 2 QTY CS 3 QTY REPORT TYPE CS 4 12 Reinforced Concrete Deck Underwater 11/15/2016 12646 SF 12393

2016 UNDERWATER

BRIDGE INSPECTION REPORT

BRIDGE #

DISTRICT: COUNTY: CITY/TOWNSHIP:

Date of Inspection:

Equipment Used:

Inspected By:

Report Written By:

Report Reviewed By:

Final Report Date:

27554

CSAH 12 over CROW RIVER

Metro Hennepin Dayton

11/15/2016

Owens, Garrett

Garrett Owens

County Highway AgencyOwner:

MinnesotaSTATE:

UNDERWATER SUMMARY 3

UNDERWATER INSPECTION 4

UNDERWATER INSPECTION PROCEDURES 6

STRUCTURE INVENTORY 7

ELEMENTS 8

PICTURES 12

DRAWINGS 15

TABLE OF CONTENTS

PAGE NUMBER

Contractor:

(A) Remove the timber drift that has accumulated around Pier 2 including the large logs on the channel bottom, which could contribute to scour footing exposure.

(B) Monitor footing exposure at Piers 1 and 2 during future inspections. Due to the scour code and the change in the extent of footing exposure noted at Pier 1 since the last underwater inspection, scour countermeasures may be necessary if footing exposure continues to increase.

(C) Repair and/or replace the grouted rip-rap erosion protection at the East Abutment.

(D) Reinspect the submerged substructure at the normal maximum recommended (NBIS) interval of sixty (60) months.

Collins Engineers, Inc.

9687Contractor Job Number:

RECOMMENDATIONS

REPORT SUMMARY

UNDERWATER INSPECTION

The substructure units inspected at Bridge No. 27554, Piers 1 and 2, were found to be in satisfactory condition with no significant structural defects observed. Generally, the concrete of the piers was smooth and sound with no notable defects. A heavy accumulation of timber debris was observed upstream of Pier 2. The entire footing of Pier 1 was exposed with a maximum of 3.5 feet vertical exposure at the upstream nose. The top of the footing was exposed at the upstream nose of Pier 2, no vertical exposure noted. Heavy erosion of the grouted rip-rap protection was observed along the East Abutment.

(A) The entire perimeter of the footing was exposed at 5.0 feet below the waterline around Pier 1 with a maximum of 3.5 feet of vertical exposure at the upstream nose.

(B) The top of footing was partially exposed up to 6 feet off the upstream nose and 5 feet down both the east and west faces at 4.8 feet below the waterline around Pier 2 with no vertical exposure noted.

(C) Concrete of Piers 1 and 2 was smooth and sound.

(D) The grouted rip-rap, up to 18 inches in diameter, that protected the East Abutment exhibited heavy erosion with up to 75 percent loss of cobbles.

(E) A heavy accumulation of timber debris, consisting of 24-inch-diameter and smaller logs and branches, was observed at the upstream nose of Pier 2. The debris extended from the channel bottom to 3 feet above the waterline, 15 feet off of the west pier face and up to 10 feet off of the upstream nose.

INSPECTION FINDINGS

Page 3 of 16

The top of the concrete railing, at the downstream end of Pier 2.Water Level Reference:

WATERLINE DATUM

Waterline Elevation (feet):

The waterline was approximately 26.6 feet below reference.Description:

844.4

4.

Piers 1 and 2Substructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

8.6Maximum Water Depth at Substructure(s) Inspected (feet):

Each pier consists of an oblong rectangular shaft with rounded noses that rests upon a rectangular footing founded on timber piling.

Code:Item 62: Culvert:

5

Y 48 11/2016Code:Item 92B: Underwater Inspection:

Code:

(Minnesota specific codes are used for 92B and 113)

NBIS CODING INFORMATION5.

Item 60: Substructure:

Item 61: Channel and Channel Protection:

6Code:

MetroDistrict:

CSAH 12

County:

The superstructure consists of three spans of a concrete deck on multiple precast concrete girders. The superstructure is supported by two concrete piers and two concrete abutments, all of which are founded on timber piling. The piers are numbered 1 and 2 starting from the west end of the bridge.

Bridge Description:

027 - Hennepin

Facility Carried:

BRIDGE DATA1.


Bridge #:

CROW RIVERFeature Intersected:

27554

Underwater Visibility (feet):

Cloudy, 52°FWeather Conditions:

1.5

3.

2.5Waterway Velocity (ft/sec):

11/15/2016

Professional Engineer/Team Leader:

INSPECTION DATA2.

Garrett R. Owens, P.E.

Date of Underwater Inspection:

Garrett R. Owens, P.E.Inspection Diver:

Page 4 of 16

Scour 1885 EA 1

220 Reinforced Concrete Footing 30 30LF

STRUCTURAL ELEMENT CONDITION RATING

Conditions

6.

U

Bridge is scour critical because abutment or pier foundation is rated as unstable due to observed scour at bridge site.

Item 113: Scour Critical Bridge: Code:

No (Mark your selection with an X)Yes X

210

CS3 CS4

Reinforced Concrete Pier Wall 3939 LF

CS2ELEM # Unit CS1Element Description Quantity

Page 5 of 16

The routine underwater inspection of Bridge 27554 (CSAH 12 over the Crow River) was completed on November 15, 2016. The underwater inspection was conducted from a 14 ft 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 two reinforced concrete piers. According to the bridge inventory or design drawings, Piers 1 - 2 were founded on reinforced concrete footings supported on piles. Inspection procedures followed FHWA guidance and the MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for foundations. The routine 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 intensity efforts.

INSPECTION PROCEDURES


Page 6 of 16

Spec. Feat.Pier Foundation (Material/Type)

1 - CONCCantilever ID

+ W A T E R W A Y +Number of Spans Historic Status

3 - FTG PILE

Underwater 60Culvert Type 3 - FTG PILE

Pinned Asbly.

11/15/2016

Barrel Length

322.6 ft. Navigation Control

Waterway Opening (sf.) 4200Structure Length

ft. Year Painted

0 - No nav. control on waterwayDeck Width (Out-to-Out) 39.2

+ P A I N T +

APPR: 0 TOTAL:5 - Not eligible

MAIN: 3

Main Span Length 106.4 ft.Drainage Area (sq. mi.) 2761.0

B R I D G E D A T A +Main Span Detail

1 - MEETS STANDARDS+ M I S C.

Appr. Span Type Structure Flared

GR Termini 0 - SUBSTANDARD

Appr. Guardrail

Main Span Type 5 - Prestress or Precast Median Width On Bridge

ft. Bridge Railing 0 - SUBSTANDARD

1 - MEETS STANDARDS

Main Span Design 01 - Beam Span

ft. GR Transition

Skew 13 RIGHT

Y/N Freq Date

Abutment Foundation (Material/Type)

1 - CONC Frac. Critical

D E P T H I N S P. +Appr. Span Design

0 - No flare+ I N

Appr. Span Detail Field Conn. ID

Parallel Structure N - No parallel structure

Pier Protection

0 - Not Required

Rating Date 5/1/199010323 sq. ft. Traffic

ft. 50B. Rt 1.30Sidewalk Width 50A. Lt 3.80

Roadway Area (Curb-to-Curb)

Posted Load 0 - Not Required

PostingStructure Area (Out-to-Out) 12646 sq. ft.

DBL:VEH: SEMI:

Rt 17 ARail Type Lt 17 C N - N/AN - N/A B N - N/A

N - Not Applicable Overweight Permit CodesCurb Height Lt

ft. Horizontal 1 - Object Markers

0.83 ft. Vertical0.83 ft. Rt

Wear Surf Install Year 2001

sq. ft. Nav. Vert. Lift Bridge Clear. (ft.)

U - CRIT - PROT REQD

Year 1995Primer Type MN Scour Code

Painted Area

Unsound Paint % Nav. Clr. (ft.)

_

Deck Material 1 - Concrete Cast-in-Place 0.0Wear Surf Type 4 - Low Slump Concrete

Vert. 0.0 Horiz.

S I G N S +Operating Rating 2 - HS TRUCK

0 - None + B R I D G E

Inventory Rating 2 - HS TRUCK 25.7

47.0Deck Rebars Install Year

Deck Rebars

Finish TypeWear Course/Fill Depth 0.16 ft.

0 - None

Design Load 5 - HS 20

+ C A P A C I T Y R A T I N G S +Deck Membrane

45 ° 14

Inspector Name Owens, Garrett

Latitude Control Section (TH Only) Status' 39.79 ''

2 - 2-way traffic

Routine Inspection Frequency 24

Sect., Twp., Range

AT W CO LINE IN DAYTON Level of Service 1 - MAINLINE

- 23W Roadway Type36 - 121N

Detour Length 6.0 mi.R A T I N G S +

Custodian 02 - County Highway Agency

Owner 02 - County Highway AgencyDeck 7 Unsound

Deck %

C O N D I T I O N° 31 '

A - Open

Longitude 93 011+00.692 + N B I 20.28 '' Reference Point

Crew

+ I N S P E C T I O N +

Agency Br. No. 67

District 05

Bridge Match ID (TIS) 0 Userkey

CSAH 12 over CROW RIVER

Minnesota Structure Inventory Report

Bridge ID: 27554

+ G E N E R A L + + R O A D W A Y +

Date: 01/31/2017

Sufficiency Rating 95.4Roadway Name or Description

12

City Dayton

Routine Inspection Date 06/15/2015

Desc. Loc.

Township CSAH 12

Number

NRoadway O/U Key Route On StructureMaint. Area Structurally Deficient

NRoute Sys 04 - CSAHCounty 027 - Hennepin Functionally Obsolete

Lanes

Waterway Adequacy 8Max. Vert. Clear.

ft.Legislative District 32Aft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 32.00 ft.

Vertical Clearance ft.1 - ON

Underclearances N

Service On 5 - Highway-pedestrian Appr. Surface Width+ S A F E T Y F E A T U R E S +

5 - Waterway Bridge Roadway Width 32.0

32.0 ft.

Service Under

ft.

31.9 ft. Approach Alignment 8Horizontal Clear.

ft.

ft.+ S T R U C T U R E + Lateral Clearance

HCADT ADTT6

Year Built 1973

MN Year Reconstructed Functional Class

%Channel 5

Substructure

0Superstructure 6

ON 2 UNDER

3304 YEAR 2008BMU Agreement ADT

Structure Evaluation 6If Divided

D I M E N S I O N S +Bridge Plan Location 3 - COUNTY

11/1/1973Deck Geometry 4

NB-EB SB-WBDate Opened to Traffic

+ R D W Y

FHWA Year Reconstructed

MN Temporary Status

16 - Urban - Minor ArterialCulvert N

A P P R A I S A L R A T I N G S ++ N B I

Page 7 of 16

County:

City:

Township:

Township:Section: Range:

Span Type:

NBI Deck: Super: Sub: Chan: Culv:

Appraisal Ratings - Approach: Waterway:

Required Bridge Signs - Load Posting:

Horizntal:

Traffic:

Vertical:

MN Scour Code:

Open, Posted, Closed:

Location:

Route:

Control Section:

Local Agency Bridge Nbr.:

Ref. Pt.:

Maint. Area:

Length:

Deck Width:

Rdwy. Area/ Pct. Unsnd:

Paint Area/ Pct. Unsnd:

Culvert:

Hennepin

Dayton

121N36 23W

5 - Prestressed Concrete 2 -Stringer/Multi-beam or Girder

7 6 6 5 N

8 8

0 - Not Required

1 - Object Markers

0 - Not Required

N - Not Applicable

U - CRIT - PROT REQD

AT W CO LINE IN DAYTON

04 - CSAH 12 011+00.692

322.6

39.2

10323 sq. ft. / %

sq. ft. / %

N/A

A - Open

ft.

ft.

Postings:List:

MINNESOTA BRIDGE INSPECTION REPORT

02/01/2017

BRIDGE 27554 CSAH 12 OVER CROW RIVER

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 95.4

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Reinforced Concrete Deck 11/15/2016 12646 SF 12393 0 253 012 Underwater

12646 SF 12393 0 253 0Migrated Values

Notes: 359. Trans cracks w/ efflor in deck and copings. Unsound deck repaired in '01. Vert cracks thru deck @ railing joints in both sides.'10-spall in N coping over E pier. '13-no change. '15-165' of trans cracks w/ efflor, mostly around piers.

510 - Wearing Surfaces 10323 SF 10323 0 0 0

Notes: Low Slump Overlay with Uncoated Rebar Notes: 22. 6% unsound deck repaired and new 2" conc O/L in '01. Extensive trans and longcracks throughout WBL. '10-cracks in thickened slab @ W end. '13-no change. '15-some wear noticeable in wheel tracks.

Underwater 11/15/2016


Prestressed Concrete OpenGirder/Beam

11/15/2016 1273 LF 1270 3 0 0109 Underwater

1273 LF 1270 3 0 0Migrated Values

Notes: 109. Minor spalls @ ends of many fascia beams beyond sole plate. Discoloration on outside of W end of S fascia beam in E span. Spallw/ rust on N side of 2nd beam from S between 1st and 2nd diaphragm in W span. '10-Looking N @ S end of W pier cap, sole plates of beamsappear offset +/- 1" toward the W. Span 1 sole plate for all 4 beams overhangs bearing plate by +/- 1/2"-monitor for change(photos). Efflor onends of beams over piers. Rust stain on S side of 2nd beam from N in E span. '15-small spall(<.5 SF) in S side of N fascia, 40' from W abut.

Reinforced Concrete Pier Wall 11/15/2016 39 LF 38 1 0 0210 Underwater


Notes: 210. WEST-1' X 1' forming defect on both sides @ waterline. '15-defects(delams) are +/- 8' below bottom of cap-should be CS 2.EAST-honeycombing on E side of N half. '15-no change.

Reinforced Concrete Abutment 11/15/2016 122 LF 106 16 0 0215 Underwater


Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0).215. Vert and horiz cracks w/ efflor. Both footings exposed. Leakage @ both. '10-parapet and seats completely wet after rain. East-bit feltprojected out. '13-no change. '15-both have some flaking paint & rust stains in cracks.

Wingwall notes: 387. '15-all show some minor paint discoloration or flaking.

Reinforced Concrete Pile Cap/Footing 11/15/2016 30 LF 0 30 0 0220 Underwater

Notes: [2016] Underwater Inspection - The entire perimeter of the footing was exposed at 5.0 feet below the waterline around Pier 1 with amaximum of 3.5 feet of vertical exposure at the upstream nose. The top of footing was partially exposed up to 6 feet off the upstream nose and5 feet down both the east and west faces at 4.8 feet below the waterline around Pier 2 with no vertical exposure noted.

Reinforced Concrete Pier Cap 11/15/2016 72 LF 72 0 0 0234 Underwater


Notes: 234. Few vert hairline cracks on both sides of both caps. '13-no change. '15-same.

Page 8 of 16

Strip Seal Expansion Joint 11/15/2016 39 LF 35 4 0 0300 Underwater


Notes: 300. New joint @ W end only in '01. Full of sand. Possible leakage-water on abut seat below. Part of extrusion loose from conc (+/-4').'13-W joint repaired. S end of W joint leaking. '15-joints partially filled w/ sand.

Pourable Joint Seal 11/15/2016 79 LF 79 0 0 0301 Underwater


Notes: 301.

Movable Bearing 11/15/2016 20 EA 12 8 0 0311 Underwater

20 EA 12 8 0 0Migrated Values

Notes: 311. Abuts, P1 & W side of P2. Bearings very rusted @ abuts. '13-leaking water to seats from joints above. '15-no water on seats.

Fixed Bearing 11/15/2016 4 EA 4 0 0 0313 Underwater


Notes: 313. E side of P2. Span 3, E pier. '13-some anchor bolts bent. '15-minor surface rust on all.

Metal Bridge Railing 11/15/2016 646 LF 323 323 0 0330 Underwater


Notes: [2016] Migrator assumed concrete/metal combination type rail.333. Vert cracks in rail base sealed. Sealed spalls on both rails. At W end of S fascia beam in E span, there is discoloration on outside of rails @each steel rail post. '13-no change. '15-cracks are sealed.

515 - Steel Protective Coating 999 SF 999 0 0 0

Notes: [2016] Migrator assumed CS1 and a quantity of 999 SF.

Underwater 11/15/2016


Reinforced Concrete Bridge Railing 11/15/2016 646 LF 323 323 0 0331 Underwater


Notes: [2016] Migrator assumed concrete/metal combination type rail.333. Vert cracks in rail base sealed. Sealed spalls on both rails. At W end of S fascia beam in E span, there is discoloration on outside of rails @each steel rail post. '13-no change. '15-cracks are sealed.

Critical Deficiencies or Safety Hazards 11/15/2016 1 EA 1 0 0 0800 Underwater


Notes: No critical structural deficiencies or serious safety hazards are present on this structure.

Concrete Decks - Cracking & Sealing 11/15/2016 0 LF 0 0 0 0810 Underwater


Notes: 358. '13-density >5'. Cracks minor in size. '15-no change.

Bituminous Approach Roadway 11/15/2016 2 EA 2 0 0 0822 Underwater


Notes: 320. O/L in '01. New bit in '08 on W end. '13-no change. '15-EBL on E end has mod horiz crack near joint.

Secondary Members (Superstructure) 11/15/2016 1 EA 1 0 0 0855 Underwater


Notes: 380. Conc diaphragms.

Concrete Shear Cracking 11/15/2016 1 EA 1 0 0 0883 Underwater


Notes: Use this element to monitor the presence of shear cracking on concrete elements. Pay particular attention to the concrete pier caps andprestressed concrete beams.


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 9 of 16

Scour 11/15/2016 1 EA 0 1 0 0885 Underwater


Notes: U-scour critical-protection required. Monitoring required. Critical flood elevation sign in place.[2016] Underwater Inspection - The entire perimeter of the footing was exposed at Pier 1 with a maximum of 3.5 feet of vertical exposure at theupstream nose. This represents a maximum increase of footing exposure of approximately 2.8 feet since the 2012 Underwater Inspection.

Other Bridge Signing 11/15/2016 1 EA 1 0 0 0891 Underwater


Notes: 981. Horiz clearance marker X4-4 @ all corners. Plow up/down X4-5 @ NE, NW and SW guardrail ends. Do Not Pass sign @ NEcorner. Crow RIver sign in NE. '15-Hennepin County sign in SE.

Slopes & Slope Protection 11/15/2016 1 EA 0 1 0 0892 Underwater


Notes: 985. 20% of grouted rip rap is eroded on W side. New grouted rip rap on E slope in '09. '13-slope failure @ W abut, just below 1stdiaphragm E of abut. '15-no change.

Guardrail 11/15/2016 1 EA 1 0 0 0893 Underwater


Notes: 982. 2 nuts missing @ guardrail connection in NE. Ends turned down on both E rails. Minor rail damage @ NE end. Crashworthy endson W rails. '13-no change. '15-minor damage in NW rail. Minor damage to SE @ connection to bridge.

Deck & Approach Drainage 11/15/2016 1 EA 1 0 0 0894 Underwater


Notes: 984.

Sidewalk, Curb, & Median 11/15/2016 1 EA 1 0 0 0895 Underwater


Notes: 986.

Miscellaneous Items 11/15/2016 1 EA 1 0 0 0899 Underwater


Notes: 988. Some tree debris @ E pier and channel. Culvert near SW corner. MH in NE corner N of slope paving. Buried gas pipeline S ofbridge. Many swallow nests @ fascia beams and slab cantilevers. Graffiti on W side. '13-culvert @ SW corner is eroded 2.5' back from bottomof apron. '15-no debris buildup @ piers.

Protected Species 11/15/2016 1 EA 0 1 0 0900 Underwater


Notes: [2016] Migrator determined the presence of swallows on this structure based on data in the inventory or comments in thegeneral/miscellaneous notes.

General Notes: Bridge 27554 CSAH 12/Crow River 06/15/15 PTH and JDE. 60' snooper over N side only. Flaggers for one lane traffic.NOTES: SP 27-030-03, HC Project #9922 Bridge Federal Aid Preservation Project Deck Repair, Overlay and ApproachTreatment in 2001.

Recommended Repairs:

22. Seal cracks in O/L.109. Monitor sole plate/ bearing alignment @ W pier.311. Replace rusted abut bearings.985. Repair grouted rip rap slope on W side.320. Repair E end approach panel/deck joint. Clean and check for leaks.

58. Deck NBI:

36A. Brdg Railings NBI:

36B. Transitions NBI:

36C. Appr Guardrail NBI:

36D. Appr GuardrailTerminal NBI:

59. Superstructure NBI: Bearings very rusted at abutments.


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 10 of 16


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Inspector's Signature Reviewer's Signature

59. Superstructure NBI:

60. Substructure NBI:

61. Channel NBI:

62. Culvert NBI:

71. Waterway Adeq NBI:

72. Appr RoadwayAlignment NBI:

Bearings very rusted at abutments.

[2016] Underwater Inspection - Channel has moderate degradation, noticeable in the extent of footing exposure noted at Pier1.

Page 11 of 16

Photo 1 - Upstream Elevation Looking North

Photo 2 - Downstream Elevation Looking South

Pictures

Page 12 of 16

Pictures

Photo 3 - View of West Shoreline Looking Southwest

Photo 4 - Typical View of Pier 1 Looking Southwest

Page 13 of 16

Pictures

Photo 5 - Typical View of Pier 2 Looking Southwest

Photo 6 - View of East Shoreline Looking Southeast

Page 14 of 16

Page 15 of 16

Page 16 of 16

Documents

BRIDGE # CSAH 12 over CROW RIVER...NBR ELEMENT NAME INSP. DATE QUANTITY QTY CS 1 QTY CS 2 QTY CS 3 QTY REPORT TYPE CS 4 12 Reinforced Concrete Deck Underwater 11/15/2016 12646 SF 12393