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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.
UNDERWATER INSPECTION
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
UNDERWATER INSPECTION
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
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
10323 SF 10323 0 0 0Migrated Values
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.
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.
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.
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.
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.
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.
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
1 EA 1 0 0 0Migrated Values
Notes: No critical structural deficiencies or serious safety hazards are present on this structure.
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.
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 27554 CSAH 12 OVER CROW RIVER
REPORT TYPE
Page 9 of 16
Scour 11/15/2016 1 EA 0 1 0 0885 Underwater
1 EA 1 0 0 0Migrated Values
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
1 EA 1 0 0 0Migrated Values
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.
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
1 EA 1 0 0 0Migrated Values
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.
Sidewalk, Curb, & Median 11/15/2016 1 EA 1 0 0 0895 Underwater
1 EA 1 0 0 0Migrated Values
Notes: 986.
Miscellaneous Items 11/15/2016 1 EA 1 0 0 0899 Underwater
1 EA 1 0 0 0Migrated Values
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
1 EA 0 1 0 0Migrated Values
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.
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 27554 CSAH 12 OVER CROW RIVER
REPORT TYPE
Page 10 of 16
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 27554 CSAH 12 OVER CROW RIVER
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