BRIDGE # CSAH 7 over MINNESOTA RIVER - dot.state.mn.us · 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

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:

64504

CSAH 7 over MINNESOTA RIVER

District 8 Redwood SWEDES FOREST

06/20/2016

Forsyth, Roy

Roy Forsyth

County Highway AgencyOwner:

MinnesotaSTATE:

UNDERWATER SUMMARY 3

UNDERWATER INSPECTION 4

UNDERWATER INSPECTION PROCEDURES 6

STRUCTURE INVENTORY 7

ELEMENTS 8

PICTURES 11

DRAWINGS 13

TABLE OF CONTENTS

PAGE NUMBER

Contractor:

(A) Investigate revision of a scour critical code given the recent installation of scour countermeasures at the bridge site.

(B) Reinspect the submerged substructure units 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. 64504, Piers 1 and 2, were found to be in good condition below water with no structurally significant defects observed. Riprap was observed at the upstream and downstream noses of Piers 1 and 2 extending from the streambed up 6 feet. Timber debris was observed from channel bottom to 20' above waterline and 20' upstream and downstream of fascias along both faces of Pier 1. At Pier 2 there was timber debris along the upstream end from channel bottom up 3 feet. The top of footing of Pier 1 was vertically exposed near the midpoint along the north face. The channel bottom material at Pier 1 consisted of silty sand allowing up to 1 foot of probe rod penetration and at Pier 2 consisted of sand and gravel allowing a maximum probe rod penetration of 6 inches.

(A) Large deposits of riprap have been placed at both upstream and downstream noses of Piers 1 and 2 sometime between the 2007 and 2012 inspection. The riprap deposits remedied the previously observed footing exposure and undermining at Piers 1 and 2.

(B) Timber debris was observed from channel bottom to 20' above waterline and 20' upstream and downstream of fascias along both faces of Pier 1.

(C) Timber debris, consisting of a 10 feet long by 24 inch diameter log and a 30 feet long by 12 inch diameter log, was observed at the upstream end of Pier 2 from the channel bottom up 3 feet.

(D) The top of footing of Pier 1 was exposed up to 2.2 feet vertically near the midpoint.

(E) The channel bottom material at Pier 1 consisted of silty sand allowing up to 1 foot of probe rod penetration.

(F) The channel bottom material at Pier 2 consisted of sand and gravel allowing a maximum probe rod penetration of 6 inches.

INSPECTION FINDINGS

Page 3 of 14

Top of the pier cap at the downstream end of Pier 1.Water Level Reference:

WATERLINE DATUM

Waterline Elevation (feet):

The waterline was approximately 20.8 below the reference. Description:

852.0

4.

Piers 1 and 2Substructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

8.0Maximum Water Depth at Substructure(s) Inspected (feet):

Each pier consists of an oblong rectangular shaft with rounded ends that rests upon a rectangular footing. The footing at Pier 1 is founded on steel H-piles and the footing at Pier 2 is founded on bedrock.

Code:Item 62: Culvert:

7

Y 48 06/2016Code: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:

7Code:

District 8District:

CSAH 7

County:

The superstructure consists of a three span steel girder structure supporting a reinforced concrete deck. The superstructure is supported by two reinforced concrete piers and two reinforced concrete abutments. The piers are numbered 1 and 2 starting from the south end of the bridge. Pier 2 is founded on bedrock and Pier 1 is founded on steel H-piles.

Bridge Description:

064 - Redwood

Facility Carried:

BRIDGE DATA1.


Bridge #:

MINNESOTA RIVERFeature Intersected:

64504

Underwater Visibility (feet):

Sunny, 70°FWeather Conditions:

None/ Negligible

3.

0.5 ft/sWaterway Velocity (ft/sec):

06/20/2016

Professional Engineer/Team Leader:

INSPECTION DATA2.

Roy A. Forsyth

Date of Underwater Inspection:

Marc SternInspection Diver:

Page 4 of 14

Reinforced Concrete Pile Cap/Footing 15220 LF 15

885 Scour 1 1EA

STRUCTURAL ELEMENT CONDITION RATING

Conditions

6.

R

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:

X No (Mark your selection with an X)Yes

205

CS3 CS4

Reinforced Concrete Column 22 EA

CS2ELEM # Unit CS1Element Description Quantity

Page 5 of 14

The routine underwater inspection of Bridge 64504 (CSAH 7 over the Minnesota River) was completed on June, 20, 2016. The underwater inspection was conducted from shore. 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 2 reinforced concrete pier walls. According to the bridge inventory or design drawings, Piers 1 was founded on steel H-piles and Pier 2 was founded on bedrock. Inspection procedures followed FHWA guidance and the MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for bottom 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 14

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.

06/20/2016

Barrel Length

347.0 ft. Navigation Control

Waterway Opening (sf.) 8880Structure Length

ft. Year Painted 1966

0 - No nav. control on waterwayDeck Width (Out-to-Out) 34.0

+ P A I N T +

APPR: 0 TOTAL:5 - Not eligible

MAIN: 3

Main Span Length 131.0 ft.Drainage Area (sq. mi.)

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

0 - SUBSTANDARD+ M I S C.

Appr. Span Type Structure Flared

GR Termini 0 - SUBSTANDARD

Appr. Guardrail

Main Span Type 4 - Steel Continuous Median Width On Bridge

ft. Bridge Railing 0 - SUBSTANDARD

0 - SUBSTANDARD

Main Span Design 01 - Beam Span

ft. GR Transition

Skew 20 RIGHT

Y/N Freq Date

Abutment Foundation (Material/Type)

1 - CONC Frac. Critical

4 - Bolted

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 6/1/197310409 sq. ft. Traffic

ft. 50B. Rt 0.00Sidewalk Width 50A. Lt 0.00

Roadway Area (Curb-to-Curb)

Posted Load 0 - Not Required

PostingStructure Area (Out-to-Out) 11798 sq. ft.

DBL:VEH: SEMI:

Rt 01 ARail Type Lt 01 C N - N/AN - N/A B N - N/A

N - Not Applicable Overweight Permit CodesCurb Height Lt

ft. Horizontal 1 - Object Markers

0.00 ft. Vertical0.00 ft. Rt

Wear Surf Install Year

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

P - STBL - PROT INPL

Year 2015Primer Type 1 - Lead - non 3309 MN Scour Code

Painted Area

Unsound Paint % Nav. Clr. (ft.)

_

Deck Material 1 - Concrete Cast-in-Place 0.0Wear Surf Type 6 - Bituminous

Vert. 0.0 Horiz.

S I G N S +Operating Rating 1 - H TRUCK

0 - None + B R I D G E

Inventory Rating 1 - H TRUCK 27.9

44.3Deck Rebars Install Year

Deck Rebars

Finish Type F - - Phenolic Resin AlumWear Course/Fill Depth 0.00 ft.

0 - None

Design Load 4 - H 20

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

44 ° 41

Inspector Name Forsyth, Roy

Latitude Control Section (TH Only) Status' 42.85 ''

2 - 2-way traffic

Routine Inspection Frequency 24

Sect., Twp., Range

1.6 MI N OF JCT CSAH 27 Level of Service 1 - MAINLINE

- 37W Roadway Type8 - 114N

Detour Length 7.0 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° 20 '

A - Open

Longitude 95 037+00.400 + N B I 24.43 '' Reference Point

Crew

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

Agency Br. No. 104

District 08

Bridge Match ID (TIS) 0 Userkey

CSAH 7 over MINNESOTA RIVER

Minnesota Structure Inventory Report

Bridge ID: 64504

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

Date: 07/11/2016

Sufficiency Rating 96.7Roadway Name or Description

7

City

Routine Inspection Date 09/08/2015

Desc. Loc.

Township 64019 - SWEDES FOREST CSAH 7

Number

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

NRoute Sys 04 - CSAHCounty 064 - Redwood Functionally Obsolete

Lanes

Waterway Adequacy 8Max. Vert. Clear.

ft.Legislative District 20Bft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 30.00 ft.

Vertical Clearance ft.1 - ON

Underclearances N

Service On 1 - Highway Appr. Surface Width+ S A F E T Y F E A T U R E S +

5 - Waterway Bridge Roadway Width 30.0

30.0 ft.

Service Under

ft.

ft. Approach Alignment 7Horizontal Clear.

ft.

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

HCADT ADTT7

Year Built 1966

MN Year Reconstructed Functional Class

%Channel 7

Substructure

0Superstructure 7

ON 2 UNDER

529 YEAR 2008BMU Agreement ADT

Structure Evaluation 7If Divided

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

Deck Geometry 6NB-EB SB-WBDate Opened to Traffic

+ R D W Y

FHWA Year Reconstructed

MN Temporary Status

07 - Rural - Major CollectorCulvert N

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

Page 7 of 14

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:

Redwood

64019 - SWEDESFOREST

114N8 37W

4 - Steel Continuous 2 -Stringer/Multi-beam or Girder

7 7 7 7 N

7 8

0 - Not Required

1 - Object Markers

0 - Not Required

N - Not Applicable

P - STBL - PROT INPL

1.6 MI N OF JCT CSAH 27

04 - CSAH 7 037+00.400

347.0

34.0

10409 sq. ft. / %

sq. ft. / %

N/A

A - Open

ft.

ft.

Postings:List:

MINNESOTA BRIDGE INSPECTION REPORT

09/12/2016

Inspector: CO Bridge

BRIDGE 64504 CSAH 7 OVER MINNESOTA RIVER

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 96.7

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Reinforced Concrete Deck 07/11/2016 11798 SF 11798 0 0 012 Underwater

11798 SF 11798 0 0 0Migrated Values

Notes: 2012 - 18"-30" SPALL, 3" IN DEPTH, EXPOSED REBAR, IN WEST BAY BETWEEN N. ABUT AND PIER 2.

510 - Wearing Surfaces 10409 SF 10409 0 0 0

Notes: Low Slump Overlay with Uncoated Rebar Notes: 2012- DECK/RAILING REHAB 20122014- SMALL SURFACE CRACKS IN LS OVERLAY

Underwater 07/11/2016


Steel Open Girder/Beam 07/11/2016 1388 LF 1 1387 0 0107 Underwater

1388 LF 1 1387 0 0Migrated Values

Notes: 2004 - 008-GIRDERS 1088' OF CS2, REMAINDER IS CS3. THE CS3 IS FORMING ON THE BOTTOM FLANGES OF THE GIRDERSAND UNDER THE DRAINS

515 - Steel Protective Coating 999 SF 0 0 779 220

Notes: [2016] Migrator assumed quantity of 999 SF and estimated the condition states.

Underwater 07/11/2016


Reinforced Concrete Column 07/11/2016 2 EA 0 2 0 0205 Underwater

2 EA 0 2 0 0Migrated Values

Notes: 2014- QTY CORRECTION, 2 PIERS, MINOR CRACKING/SPALLING

Reinforced Concrete Abutment 07/11/2016 115 LF 115 0 0 0215 Underwater


Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0).2012 - MINOR CRACKS

Reinforced Concrete Pile Cap/Footing 07/11/2016 15 LF 15 0 0 0220 Underwater

Notes: The top of footing was exposed up to 2.2 feet vertically near the mid point on the north side of Pier 1.

Reinforced Concrete Pier Cap 07/11/2016 75 LF 75 0 0 0234 Underwater


Notes: 2014- MINOR CRACKING/SPALLING

Compression Joint Seal 07/11/2016 64 LF 64 0 0 0302 Underwater


Notes: 2014- BLADDER FILLED WITH SAND BOTH SIDES

Page 8 of 14

Movable Bearing 07/11/2016 12 EA 0 12 0 0311 Underwater


Notes: 2004 - 096-SURFACE AND PACK RUST OCCURING (MODERATE TO HEAVY CORROSION) @ BASE OF BEARINGS (ALLBEARINGS)2008 - MORE PREVELENT ON BOTH ABUT. BEARING BASES.2012 - NEW PINS INSTALLED ON ABUT BEARINGS

Fixed Bearing 07/11/2016 4 EA 4 0 0 0313 Underwater


Reinforced Concrete Bridge Railing 07/11/2016 696 LF 696 0 0 0331 Underwater


Notes: 2014- MINOR CRACKS BETWEEN CONTROL JOINTS

Critical Deficiencies or Safety Hazards 07/11/2016 1 EA 1 0 0 0800 Underwater


Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION.

Concrete Decks - Cracking & Sealing 07/11/2016 0 LF 0 0 0 0810 Underwater


Notes: 2008 - TRANSVERSE CRACKS AND SPALLS IN VARIOUS SPOTS, 2010 - SPALLS BECOMING MORE PREVALENT AND LARGER2012 - DECK REHAB AND NEW CONCRETE OVERLAY2014 - MINOR CRACKS

Plow Fingers 07/11/2016 1 EA 1 0 0 0815 Underwater


Notes: 2012 - NEW PLOW STRAPS

Bituminous Approach Roadway 07/11/2016 2 EA 2 0 0 0822 Underwater


Notes: 2012 - NEW BIT OVERLAY

Concrete Shear Cracking 07/11/2016 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.

Scour 07/11/2016 1 EA 0 1 0 0885 Underwater


Notes: 08/24/2015 POA: P - Stable due to protection. Inspect countermeasures.2012 - RIPRAP PLACED AT PIERS[2016] Underwater Inspection - The top of footing of Pier 1 was exposed up to 2.2 feet vertically along the north side near the midpoint.

Other Bridge Signing 07/11/2016 1 EA 1 0 0 0891 Underwater


Slopes & Slope Protection 07/11/2016 1 EA 1 0 0 0892 Underwater


Guardrail 07/11/2016 1 EA 1 0 0 0893 Underwater



QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 9 of 14

Deck & Approach Drainage 07/11/2016 1 EA 1 0 0 0894 Underwater


Protected Species 07/11/2016 1 EA 1 0 0 0900 Underwater


Notes: Use this element to track the presence of protected species living on this structure.

General Notes:

Inspector's Signature Reviewer's Signature

Inventory Notes:

2007 - UNDERWATER INSPECTION DONE 10/21/2007 FILED IN OFFICE - RECOMMENDATIONS: MONITOR THESCOUR AND FOOTING EXPOSURE/UNDERMINING DURING MAJOR FLOOD EVENTS. DESIGN AND INSTALL SCOURCOUNTERMEASURES AT BOTH PIERS. REMOVE THE HEAVY ACCUMULATION OF TIMBER DEBRIS FROM AROUNDPIER 1. REINSPECT THE SUBMERGED SUBSTRUCTURE UNITS AT THE NORMAL MAXIMUM RECOMMENDED (NBIS)INTERVAL OF FIVE YEARS. IF IN THE INTERIM, SCOUR OR UNDERMINING CONCERNS ARISE DUE TO THERECOMMENDED MONITORING OR HIGH WATER/FLOW CONDITIONS, AN UNDERWATER INSPECTION MAY BEWARRANTED AT THAT TIME.

58. Deck NBI:

36A. Brdg Railings NBI:

36B. Transitions NBI:

36C. Appr Guardrail NBI:

36D. Appr GuardrailTerminal NBI:

59. Superstructure NBI:

60. Substructure NBI:

61. Channel NBI:

62. Culvert NBI:

71. Waterway Adeq NBI:

72. Appr RoadwayAlignment NBI:

MINOR CRACKING

MINOR RUST, FAILING PAINT

MINOR CRACKING, MINOR SPALLS

Footing was exposed at Pier 1.


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 10 of 14

Photo 2 - View of the South Abutment, looking south.

Photo 3 - View of the North Abutment, looking north.

Pictures

Page 11 of 14

Pictures

Photo 4 - View of Pier 2, looking south.

Photo 5 - View of Pier 1, looking south.

Page 12 of 14

Page 13 of 14

Page 14 of 14

Documents

BRIDGE # CSAH 7 over MINNESOTA RIVER - dot.state.mn.us · 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