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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:
32501
CSAH 4 over DES MOINES RIVER
District 7 Jackson PETERSBURG
06/16/2016
Forsyth, Roy
Roy Forsyth
County Highway AgencyOwner:
MinnesotaSTATE:
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UNDERWATER SUMMARY 3
UNDERWATER INSPECTION 4
UNDERWATER INSPECTION PROCEDURES 6
STRUCTURE INVENTORY 7
ELEMENTS 8
PICTURES 11
DRAWINGS 13
TABLE OF CONTENTS
PAGE NUMBER
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Contractor:
(A) 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. 32501, Piers 1
and 2, were found to be generally in good condition with no defects
of structural significance observed. The concrete was typically
smooth and sound. Large rocks were observed around the perimeter of
Pier 1 and appeared to be placed as a scour countermeasure. The
channel bottom was generally sand with minimum penetration.
(A) The concrete of Piers 1 and 2 were smooth, sound, and in
good condition.
(B) 12 inch diameter riprap was observed around the perimeter of
Pier 1. The rocks extended away from the pier 4 to 5 feet.
(C) The channel bottom was sand with 6 inches of penetration on
the north face of Pier 1.
INSPECTION FINDINGS
Page 3 of 14
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WATERLINE DATUM4.
9.2
Water Level Reference:
90.3.Waterline Elevation (feet):
The top of the pier cap at the downstream end of Pier 1. Assumed
Reference Elevation = 100.0
Substructure(s) Inspected:
SUBSTRUCTURE INSPECTION DATA3.
Piers 1 and 2
Maximum Water Depth at Substructure(s) Inspected (feet):
The piers consist of a rectangular shaft with rounded ends
supporting a hammerhead cap.
General Shape:
Code:Item 61: Channel and Channel Protection:
7
7
Code:Item 62: Culvert:
5.
The waterline was approximately 9.7 feet below reference.
Description:
NBIS CODING INFORMATION
Code:Item 60: Substructure:
(Minnesota specific codes are used for 92B and 113)
1.0 ft/s
District:
CSAH 4Facility Carried:
District 7
Bridge Description:
032 - JacksonCounty:
BRIDGE DATA1.
UNDERWATER INSPECTION
Bridge #:
DES MOINES RIVERFeature Intersected:
32501
Weather Conditions:
06/16/2016Date of Underwater Inspection:
Waterway Velocity (ft/sec):
0 ftUnderwater Visibility (feet):
INSPECTION DATA2.
The bridge structure consists of three spans of multiple steel
beam superstructure. The superstructure is supported by two
hammerhead shaped reinforced concrete piers and two reinforced
concrete abutments. The piers are numbered 1 and 2 starting from
the south end of the bridge. No design drawings were provided.
Professional Engineer/Team Leader:
Roy A. ForsythInspection Diver:
Roy A. Forsyth
Page 4 of 14
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885 1EAScour 1
STRUCTURAL ELEMENT CONDITION RATING6.
No (Mark your selection with an X)
Item 113: Scour Critical Bridge: Code:
Y 48 06/2016Item 92B: Underwater Inspection: Code:
Yes X
L
Bridge is scour critical because abutment or pier foundation is
rated as unstable due to observed scour at bridge site.
CS4CS3CS1 CS2
EA 22205 Reinforced Concrete Column
Conditions
Quantity UnitElement DescriptionELEM #
Page 5 of 14
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The routine underwater inspection of Bridge 32501 (CSAH No. 4
Over the Des Moines River) was completed on June 16, 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 and 2 were founded on pile footings. 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 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 14
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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 Y 60Culvert Type 3 - FTG PILE
Pinned Asbly. N
06/16/2016
Barrel Length
201.0 ft. Navigation Control
Waterway Opening (sf.) 3325Structure Length
ft. Year Painted 1965
0 - No nav. control on waterwayDeck Width (Out-to-Out) 30.7
+ P A I N T +
APPR: 0 TOTAL:5 - Not eligible
MAIN: 3
Main Span Length 75.0 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
NAbutment Foundation (Material/Type)
1 - CONC Frac. Critical
2 - Riveted
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 02/01/20135630 sq. ft. Traffic
ft. 50B. Rt 1.00Sidewalk Width 50A. Lt 1.00
Roadway Area (Curb-to-Curb)
Posted Load 0 - Not Required
PostingStructure Area (Out-to-Out) 6171 sq. ft.
DBL:VEH: SEMI:
Rt 31 ARail Type Lt 31 C N - N/AN - N/A B N - N/A
0 - Not Required Overweight Permit CodesCurb Height Lt
ft. Horizontal 1 - Object Markers
0.67 ft. Vertical0.67 ft. Rt
Wear Surf Install Year
sq. ft. Nav. Vert. Lift Bridge Clear. (ft.)
L - STBL - LOW RISK
Year 1994Primer Type 0 - Other - 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 2 - HS TRUCK
0 - None + B R I D G E
Inventory Rating 2 - HS TRUCK 16.4
27.6Deck Rebars Install Year
Deck Rebars
Finish Type L - Other (Unknown)Wear Course/Fill Depth 0.10
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
43 31
Inspector Name Forsyth, Roy
Latitude Control Section (TH Only) Status' 34.70 ''
2 - 2-way traffic
Routine Inspection Frequency 24
Sect., Twp., Range
0.2 MI S OF JCT CSAH 23 Level of Service 1 - MAINLINE
- 34W Roadway Type28 - 101N
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 N55 '
A - Open
Longitude 94 029+00.330 + N B I 9.00 '' Reference Point
Crew
+ I N S P E C T I O N +
Agency Br. No. 72
District 07
Bridge Match ID (TIS) 0 Userkey
CSAH 4 over DES MOINES RIVER
Minnesota Structure Inventory Report
Bridge ID: 32501
+ G E N E R A L + + R O A D W A Y +
Date: 07/25/2016
Sufficiency Rating 92.6Roadway Name or Description
4
City
Routine Inspection Date 09/25/2015
Desc. Loc.
Township 32014 - PETERSBURG CSAH 4
Number
NRoadway O/U Key Route On StructureMaint. Area Structurally
Deficient
NRoute Sys 04 - CSAHCounty 032 - Jackson Functionally
Obsolete
Lanes
Waterway Adequacy 9Max. Vert. Clear.
ft.Legislative District 22Bft.Potential ABC 2 - N/A ft.
ft.On - Off System Roadway Width 28.00 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 28.0
28.0 ft.
Service Under
ft.
ft. Approach Alignment 7Horizontal Clear.
ft.
ft.+ S T R U C T U R E + Lateral Clearance
HCADT ADTT6
Year Built 1965
MN Year Reconstructed Functional Class
%Channel 5
Substructure
0Superstructure 7
ON 2 UNDER
270 YEAR 2008BMU Agreement ADT
Structure Evaluation 6If 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
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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:
Jackson
32014 - PETERSBURG
101N28 34W
4 - Steel Continuous 2 -Stringer/Multi-beam or Girder
7 7 6 5 N
7 9
0 - Not Required
1 - Object Markers
0 - Not Required
0 - Not Required
L - STBL - LOW RISK
0.2 MI S OF JCT CSAH 23
04 - CSAH 4 029+00.330
201.0
30.7
5630 sq. ft. / %
sq. ft. / %
N/A
A - Open
ft.
ft.
Postings:List:
MINNESOTA BRIDGE INSPECTION REPORT
09/12/2016
Inspector: CO Bridge
BRIDGE 32501 CSAH 4 OVER DES MOINES RIVER
Unofficial Structurally Deficient N
NUnofficial Functionally Obsolete
Unofficial Sufficiency Rating 92.6
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4REPORT TYPE
Reinforced Concrete Deck 06/16/2016 6171 SF 6171 0 0 012
Underwater
6171 SF 6171 0 0 0Migrated Values
Notes: 11/09/06 - A FEW MINOR CRACKS STILL EXIST AFTER DECK
REHAB.CRACK SOUTH OF NORTH PIER, CENTER - 6' LONG, 1/4" WIDE,
POSSIBLE DELAMINATION. 2006 (REPAIRED).10" x 15" x 1.5" deep spall
with reinforcement exposed over north pier.Date 2003-02-11 - SOME
CRACKING WITH EFFLORESCENCE AND AREAS OF SPALL. 2003OUTSIDE EDGES
SHOWING SOME SPALL WITH SOME REBAR SHOWING. 20132 SPOTS OF
DELAMINATION ON EAST EDGE @ CENTER OF DECK 2015
510 - Wearing Surfaces 5630 SF 5630 0 0 0
Notes: Low Slump Overlay with Uncoated Rebar Notes: DECK REHAB
COMPLETED 2006.
Underwater 06/16/2016
5630 SF 5630 0 0 0Migrated Values
Steel Open Girder/Beam 06/16/2016 804 LF 804 0 0 0107
Underwater
804 LF 804 0 0 0Migrated Values
Notes: 11/09/06 - BEAMS HAVE BEEN STRIPPED AND REPAINTED WHERE
NEEDED.1/25/04 - Minor areas of rust at the top flange of outer
beams, will be corrected with bridge rehab.Date 2003-02-11 - AREAS
OF RUST AND SECTION LOSS CONTAINED TO BEAM ENDS WHERE MOST DAMAGE
IS OCCURRING. 2003Date 2002-03-13 - AREAS OF RUST AND SECTION LOSS
DUE TO BAD JOINT SEALS. 2002
515 - Steel Protective Coating 999 SF 999 0 0 0
Notes: [2016] Migrator assumed quantity of 999 SF and estimated
the condition states.
Underwater 06/16/2016
999 SF 999 0 0 0Migrated Values
Reinforced Concrete Column 06/16/2016 2 EA 2 0 0 0205
Underwater
2 EA 2 0 0 0Migrated Values
Reinforced Concrete Abutment 06/16/2016 109 LF 109 0 0 0215
Underwater
109 LF 109 0 0 0Migrated Values
Notes: [2016] Migrator added 40 LF to abutment quantity to
account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0).WEST END OF SOUTH
ABUTMENT PARAPET HAS AREAS OF SPALL WITH 4 REBAR EXPOSED AND MINOR
SECTION LOSS. 2007ABUTMENTS REPAIRED DURING BRIDGE REHAB 2006. Date
2003-02-11 - LARGE AREASOF CONCRETE SECTION LOSS WITH REINFORCEMENT
EXPOSED, ESPECIALLY AT THE NORTH ABUTMENT. CONDITION ISCONTINUING
TO DETERIORATE. 2003Date 2002-03-13 - SPALLING DUE TO BAD JOINT
SEALS. (CONCRETE FLAKING) ATTENTION NEEDED TO PREVENT FURTHERDAMAGE
TO ABUTMENTS, BEARINGS AND BEAMS. 2002
Reinforced Concrete Pier Cap 06/16/2016 69 LF 69 0 0 0234
Underwater
69 LF 69 0 0 0Migrated Values
Page 8 of 14
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Strip Seal Expansion Joint 06/16/2016 66 LF 66 0 0 0300
Underwater
66 LF 66 0 0 0Migrated Values
Notes: JOINTS SHOULD BE CLEANED. 2007, 2011 CLEANED 2013NEW
STRIP JOINTS 2006.
Movable Bearing 06/16/2016 12 EA 12 0 0 0311 Underwater
12 EA 12 0 0 0Migrated Values
Notes: ABUTMENT BEARINGS WERE ALL REPLACED DURING BRIDGE REHAB
2006. ABUTMENTBEARINGS TO BE REPLACED WITH 2006 BRIDGE REHAB.
2006Date 2003-02-11 - ADVANCED CORROSION WITH A LOT OF SECTION
LOSS, ESPECIALLY AT N. ABUT. BEARINGS ARE SEATEDIMPROPERLY WITH
UNEVEN WEIGHT DISTRIBUTION. ALL MOVEABLE BEARINGS NEED TO BE
REPLACED SOON. 2003Date 2002-03-13 - BEARINGS SUFFERING PACK RUST
DUE TO BAD JOINT SEALS. 2002
Fixed Bearing 06/16/2016 4 EA 4 0 0 0313 Underwater
4 EA 4 0 0 0Migrated Values
Reinforced Concrete Bridge Railing 06/16/2016 404 LF 404 0 0
0331 Underwater
404 LF 404 0 0 0Migrated Values
Notes: 8"x10" TRIANGULAR SPALL AT NE END POST, 1'x9" TRIANGULAR
SPALL AT SW END POST CURB. 2011
Critical Deficiencies or Safety Hazards 06/16/2016 1 EA 1 0 0
0800 Underwater
1 EA 1 0 0 0Migrated Values
Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST
INSPECTION.
Bituminous Approach Roadway 06/16/2016 2 EA 2 0 0 0822
Underwater
2 EA 2 0 0 0Migrated Values
Concrete Shear Cracking 06/16/2016 1 EA 1 0 0 0883
Underwater
1 EA 1 0 0 0Migrated Values
Notes: Use this element to monitor the presence of shear
cracking on concrete elements. Pay particular attention to the
concrete pier caps.
Scour 06/16/2016 1 EA 1 0 0 0885 Underwater
1 EA 1 0 0 0Migrated Values
Notes: SCOUR POSED RISK TO SOUTH PIER COLUMN, JCHD FILLED SCOUR
HOLE WITH ROCK TO SHORE IT UP AND PREVENTFURTHER SCOUR, FALL OF
2011.
Other Bridge Signing 06/16/2016 1 EA 1 0 0 0891 Underwater
1 EA 1 0 0 0Migrated Values
Notes: N.E. BRIDGE MARKER POST BROKEN. 2013N.E. BRIDGE MARKER
REPAIRED. 2013
Slopes & Slope Protection 06/16/2016 1 EA 1 0 0 0892
Underwater
1 EA 1 0 0 0Migrated Values
Deck & Approach Drainage 06/16/2016 1 EA 1 0 0 0894
Underwater
1 EA 1 0 0 0Migrated Values
Notes: Use this element to rate the condition, function, and
adequacy of the drainage system.
Protected Species 06/16/2016 1 EA 1 0 0 0900 Underwater
1 EA 1 0 0 0Migrated Values
Notes: Use this element to track the presence of protected
species living on this structure.
General Notes: SPRING CHANNEL INSPECTION OF SOUTH PIER IS
NEEDED. 20061/26/05 - Spring inspection of channel around south
pier is needed.Date 2004-01-13 - BRIDGE REHAB SCHEDULED FOR 2006,
DECK REHAB, REPLACE EXPANSION BEARINGS,ABUTMENT REPAIR, SAND AND
PAINT STEEL GIRDERS WHERE DAMAGED.SILT ISLAND BLOCKING SPAN #3,
CORP. OF ENG. HAVE LOOKED AT THIS PROBLEM, NO DECISION
ABOUTCLEANING ON INLET, S. BANK.1992. CHANNEL RESHAPED AND RIPRAP
WAS PLACED ON INLET PORTION OFSTREAM 1994.
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 32501 CSAH 4 OVER DES MOINES RIVER
REPORT TYPE
Page 9 of 14
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ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 32501 CSAH 4 OVER DES MOINES RIVER
REPORT TYPEGeneral Notes:
Inspector's Signature Reviewer's Signature
Roy Forsyth
Inventory Notes:
1/26/05 - Spring inspection of channel around south pier is
needed.Date 2004-01-13 - BRIDGE REHAB SCHEDULED FOR 2006, DECK
REHAB, REPLACE EXPANSION BEARINGS,ABUTMENT REPAIR, SAND AND PAINT
STEEL GIRDERS WHERE DAMAGED.SILT ISLAND BLOCKING SPAN #3, CORP. OF
ENG. HAVE LOOKED AT THIS PROBLEM, NO DECISION ABOUTCLEANING ON
INLET, S. BANK.1992. CHANNEL RESHAPED AND RIPRAP WAS PLACED ON
INLET PORTION OFSTREAM 1994.
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:
Page 10 of 14
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Photo 2 - View of South Abutment, looking south.
Photo 3 - View of North Abutment, looking north.
Pictures
Page 11 of 14
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Pictures
Photo 4 - View of Pier 1, looking north.
Photo 5 - View of Pier 2, looking south.
Page 12 of 14
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Page 13 of 14
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Page 14 of 14
CoverTable of ContentsUnderwater SummaryUnderwater
InspectionUnderwater Inspection ProceduresStructure
InventoryElementsPicturesDrawings