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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:
31533
CSAH 40 over BIG FORK RIVER
District 1 Itasca T - 62 R - 25
08/02/2016
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 14
TABLE OF CONTENTS
PAGE NUMBER
Contractor:
(A) Reinspect the submerged substructure units at the normal maximumrecommended (NBIS) interval of sixty (60) months.
Collins Engineers, Inc.
9687Contractor Job Number:
RECOMMENDATIONS
REPORT SUMMARY
UNDERWATER INSPECTION
The substructure units inspected at Bridge No. 31533, Piers 1 and 2, were found to be in good condition with no defects of structural significance observed. An erosion gully, approximately 7 feet wide by 6 feet deep, was observed around the southeast embankment. All steel piles exhibited loss of painted coating from 1 foot above waterline to channel bottom. The channel bottom consisted of cobbles with gravel infill with 3 inches of penetration at Pier 2 and 12 inches of penetration at Pier 1. A log, 1 foot in diameter by 20 feet long, was observed at Pier 2 from the channel bottom up 1 foot.
(A) The southeast embankment had a 7 foot wide by 6 foot deep erosion gully.
(B) All steel piles had 100% loss of painted coating from 1 foot above waterline to the channel bottom, and 25% loss of painted coating from 1 foot above waterline to top of piles.
(C) A log, 1 foot in diameter by 20 feet long, was observed from channel bottom up 1 foot.
(D) The channel bottom at Pier 1 consisted of silt, sand, and gravel with 3 inches of maximum probe rod penetration.
(E) The channel bottom at Pier 2 consisted of 12 inch diameter cobbles with gravel infill and 12 inches of maximum probe rod penetration.
INSPECTION FINDINGS
Page 3 of 15
Top of pier cap at upstream end of Pier 1Water Level Reference:
WATERLINE DATUM
Waterline Elevation (feet):
The waterline was approximately 11.8 feet below reference. Description:
88.2
4.
Piers 1 and 2Substructure(s) Inspected:
SUBSTRUCTURE INSPECTION DATA
General Shape:
3.9Maximum Water Depth at Substructure(s) Inspected (feet):
Piers 1 and 2 consist of a single line of seven steel piles supporting a reinforced concrete cap.
Code:Item 62: Culvert:
6
Y 48 08/2016Code: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:
District 1District:
CSAH 40
County:
The superstructure consists of three spans of multiple prestressed concrete beams. The superstructure is supported by two reinforced concrete abutments founded on piles and two steel encased concrete pile piers. The piers are numbered 1 and 2 starting from the west end of the bridge.
Bridge Description:
031 - Itasca
Facility Carried:
BRIDGE DATA1.
UNDERWATER INSPECTION
Bridge #:
BIG FORK RIVERFeature Intersected:
31533
Underwater Visibility (feet):
Sunny, 75°FWeather Conditions:
0.5
3.
None/NegligibleWaterway Velocity (ft/sec):
08/02/2016
Professional Engineer/Team Leader:
INSPECTION DATA2.
Roy A. Forsyth
Date of Underwater Inspection:
Marc SternInspection Diver:
Page 4 of 15
885 Scour 1 EA 1
STRUCTURAL ELEMENT CONDITION RATING
Conditions
6.
N
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
225
CS3 CS4
Steel Pilings 1414 EA
CS2ELEM # Unit CS1Element Description Quantity
Page 5 of 15
The routine underwater inspection of Bridge 31533 (CSAH 40 over the Big Fork River) was completed on August 2, 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 piers of 7 steel pilings each. According to the bridge inventory or design drawings, Piers 1 and 2 were founded on steel piles. 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
UNDERWATER INSPECTION
Page 6 of 15
Spec. Feat.Pier Foundation (Material/Type)
3 - STEELCantilever ID
+ W A T E R W A Y +Number of Spans Historic Status
4 - PILE BENT
UnderwaterCulvert Type 3 - FTG PILE
Pinned Asbly.
08/02/2016
Barrel Length
218.6 ft. Navigation Control
Waterway Opening (sf.) 1880Structure Length
ft. Year Painted
0 - No nav. control on waterwayDeck Width (Out-to-Out) 39.3
+ P A I N T +
APPR: 0 TOTAL:5 - Not eligible
MAIN: 3
Main Span Length 71.6 ft.Drainage Area (sq. mi.) 919.0
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 1 - MEETS STANDARDS
Appr. Guardrail
Main Span Type 5 - Prestress or Precast Median Width On Bridge
ft. Bridge Railing 1 - MEETS STANDARDS
1 - MEETS STANDARDS
Main Span Design 01 - Beam Span
ft. GR Transition
Skew 15 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 11/03/20157868 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) 8591 sq. ft.
DBL:VEH: SEMI:
Rt 22 ARail Type Lt 22 C 1 - No Restriction
1 - No Restriction
B 1 - No Restriction
N - Not Applicable Overweight Permit CodesCurb Height Lt
ft. Horizontal 0 - Not Required
0.00 ft. Vertical0.00 ft. Rt
Wear Surf Install Year
sq. ft. Nav. Vert. Lift Bridge Clear. (ft.)
N - STBL - LIM SCOUR
Year 2000Primer Type MN Scour Code
Painted Area
Unsound Paint % Nav. Clr. (ft.)
1 - Not required
Deck Material 1 - Concrete Cast-in-Place 0.0Wear Surf Type 1 - Monolithic Concrete
(concurrently placed with stru
Vert. 0.0 Horiz.
S I G N S +Operating Rating 2 - HS TRUCK
1 - Epoxy Coated Reinforcing + B R I D G E
Inventory Rating 2 - HS TRUCK 25.6
42.4Deck Rebars Install Year 1997
Deck Rebars
Finish TypeWear Course/Fill Depth 0.75 ft.
0 - None
Design Load 9 - HS 25 (OR GREATER)
+ C A P A C I T Y R A T I N G S +Deck Membrane
47 ° 53
Inspector Name Forsyth, Roy
Latitude Control Section (TH Only) Status' 0.50 ''
2 - 2-way traffic
Routine Inspection Frequency 24
Sect., Twp., Range
0.7 MI W OF JCT CR 260 Level of Service 1 - MAINLINE
- 25W Roadway Type7 - 062N
Detour Length 11.0 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° 35 '
A - Open
Longitude 93 001+00.850 + N B I 20.11 '' Reference Point
31 Crew
+ I N S P E C T I O N +
Agency Br. No. 71
District 01
Bridge Match ID (TIS) 0 Userkey
CSAH 40 over BIG FORK RIVER
Minnesota Structure Inventory Report
Bridge ID: 31533
+ G E N E R A L + + R O A D W A Y +
Date: 08/17/2016
Sufficiency Rating 99.9Roadway Name or Description
40
City
Routine Inspection Date 11/18/2015
Desc. Loc.
Township 31075 - T - 62 R - 25 CSAH 40
Number
NRoadway O/U Key Route On StructureMaint. Area Structurally Deficient
NRoute Sys 04 - CSAHCounty 031 - Itasca Functionally Obsolete
Lanes
Waterway Adequacy 9Max. Vert. Clear.
ft.Legislative District 03Aft.Potential ABC 2 - N/A ft.
ft.On - Off System Roadway Width 36.00 ft.
Vertical Clearance ft.0 - OFF
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 36.0
36.0 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 1997
MN Year Reconstructed Functional Class
%Channel 6
Substructure
0Superstructure 8
ON 2 UNDER
110 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 8NB-EB SB-WBDate Opened to Traffic
+ R D W Y
FHWA Year Reconstructed
MN Temporary Status
09 - Rural - LocalCulvert N
A P P R A I S A L R A T I N G S ++ N B I
Page 7 of 15
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:
Itasca
31075 - T - 62 R - 25
062N7 25W
5 - Prestressed Concrete 2 -Stringer/Multi-beam or Girder
7 8 6 6 N
7 9
0 - Not Required
0 - Not Required
0 - Not Required
N - Not Applicable
N - STBL - LIM SCOUR
0.7 MI W OF JCT CR 260
04 - CSAH 40
31
001+00.850
218.6
39.3
7868 sq. ft. / %
sq. ft. / %
N/A
A - Open
ft.
ft.
Postings:List:
MINNESOTA BRIDGE INSPECTION REPORT
09/16/2016
Inspector: CO Bridge
BRIDGE 31533 CSAH 40 OVER BIG FORK RIVER
Unofficial Structurally Deficient N
NUnofficial Functionally Obsolete
Unofficial Sufficiency Rating 99.9
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4REPORT TYPE
Reinforced Concrete Deck 08/17/2016 8591 SF 8591 0 0 012 Underwater
8591 SF 8591 0 0 0Migrated Values
Notes: [2009-2015] No new cracks noticed, all look same. [2008] Random underdeck craking w/ efflorescence.
510 - Wearing Surfaces 7868 SF 7711 0 157 0
Notes: Top of Concrete Deck with Epoxy Reinforcement Notes: [2015] All deterioration and transverse cracks in top of deck were resealed anddeck was flood sealed in 2015. CS updated to accurately reflect field conditions as previously noted. [2009-2013] Some transverse cracking incenter span. [Saw cut cracks and epoxied same in 2003.][ Crack repairs look good.]
Underwater 08/17/2016
7868 SF 7711 0 157 0Migrated Values
Prestressed Concrete OpenGirder/Beam
08/17/2016 853 LF 853 0 0 0109 Underwater
853 LF 853 0 0 0Migrated Values
Notes: Excellent, No issues
Reinforced Concrete Abutment 08/17/2016 125 LF 125 0 0 0215 Underwater
125 LF 125 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).[2008] A couple minor vertical cracks, otherwise no issues.
Wingwall notes: [2015] Erosion close to SE wing filled in, seems stable so far. [2009] Erosion of SE ditch area starting to expose some ofwingwall, erosion problem WAS in design. Monitoring, 2010, 2011, 2013.
Steel Pile 08/17/2016 14 EA 0 14 0 0225 Underwater
14 EA 14 0 0 0Migrated Values
Notes: [2015] No changes since last notes. [2010- 2013] We drilled Artesian relief holes in two of the piles on the East Pier, their is evidence ofwater coming out of a few of them now. [2013] We also have them on annual maintenance list to clean out drilled holes so they don't plug andlet water up into cap, again.[2016] Underwater Inspection - All steel piles had 100% loss of painted coating from 1 foot above waterline to the channel bottom, and 25%loss of painted coating from 1 foot above waterline to top of piles.
515 - Steel Protective Coating 110 SF 40 70 0 0
Notes: [2016] Underwater Inspection - All steel piles had 100% loss of painted coating from 1 foot above waterline to the channel bottom, and25% loss of painted coating from 1 foot above waterline to top of piles.
Underwater 08/17/2016
999 SF 999 0 0 0Migrated Values
Reinforced Concrete Pier Cap 08/17/2016 79 LF 40 39 0 0234 Underwater
79 LF 40 39 0 0Migrated Values
Notes: [2015] No changes since last inspection. [2010- 2013] We drilled Artesian relief holes in two of the piles on the East Pier, their isevidence of water coming out of a few of them now, otherwise their are no changes of the cracks. [2007] East peir cap has cracks above 3rdpile from north ,about half way up on both sides of cap. and also hairline cracks above second pile from south going 2/3 way up just on riverside. west pier south edge some hairline cracking (like two upsidedown T's hooked together. The cracks over 3rd pile in from N ,E pier cap areBigger hairs, -1/16" or so, 12-30-08. No changes.
Page 8 of 15
Compression Joint Seal 08/17/2016 85 LF 0 85 0 0302 Underwater
85 LF 0 85 0 0Migrated Values
Notes: [2015] Added more Bituminous crack leveler / sealer. [2007-2011] Missing glan is replaced by cold mix. [2013] Cleaned and filled jointwith a new Bituminous crack sealer, 2012, seems to be working nicely.
Movable Bearing 08/17/2016 8 EA 8 0 0 0311 Underwater
8 EA 8 0 0 0Migrated Values
Notes: All in place and look good.
Fixed Bearing 08/17/2016 8 EA 8 0 0 0313 Underwater
8 EA 8 0 0 0Migrated Values
Notes: Are mostly incased in concrete, what we see looks ok.
Reinforced Concrete Approach Slab 08/17/2016 1440 SF 720 720 0 0321 Underwater
1440 SF 720 720 0 0Migrated Values
Notes: [2016] Migrator assumed an approach slab length of 20FT and used the inventory quantity of 36FT for the width.[2015] Added more Bituminous crack leveler / sealer. [2007-2011] West approach panel needs repair-spalling. Both E8S need repair. [2013]We also cleaned and filled/patched with a new Bituminous crack sealer, 2012, seems to be working nicely.
Reinforced Concrete Bridge Railing 08/17/2016 440 LF 440 0 0 0331 Underwater
440 LF 440 0 0 0Migrated Values
Notes: [2015] Crews painted on a concrete surface finish this year, top and front face only. [2007-2013] Look good, some vertical cracks,typical.
Critical Deficiencies or Safety Hazards 08/17/2016 1 EA 1 0 0 0800 Underwater
1 EA 1 0 0 0Migrated Values
Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION.
Concrete Decks - Cracking & Sealing 08/17/2016 0 LF 0 0 0 0810 Underwater
0 LF 0 0 0 0Migrated Values
Notes: [2015] Resealed all cracks in top of deck. [2007-2013] No significant changes since last inspection. [2003] Cracks in top of deck havebeen sawed and epoxi filled. repairs holding.
Concrete Shear Cracking 08/17/2016 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 prestressed concretebeams.
Scour 08/17/2016 1 EA 1 0 0 0885 Underwater
1 EA 1 0 0 0Migrated Values
Notes: stable, no issues.
Other Bridge Signing 08/17/2016 1 EA 1 0 0 0891 Underwater
1 EA 1 0 0 0Migrated Values
Notes: All signs in place
Slopes & Slope Protection 08/17/2016 1 EA 1 0 0 0892 Underwater
1 EA 1 0 0 0Migrated Values
Notes: [2015] SE wing erosion area fixed. [2009-2013]Other than SE Corner, all are mostly stable.
Guardrail 08/17/2016 1 EA 1 0 0 0893 Underwater
1 EA 1 0 0 0Migrated Values
Notes: All in good condition.
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 31533 CSAH 40 OVER BIG FORK RIVER
REPORT TYPE
Page 9 of 15
Deck & Approach Drainage 08/17/2016 1 EA 1 0 0 0894 Underwater
1 EA 1 0 0 0Migrated Values
Notes: West storm sewer seems to be working as intended.
Miscellaneous Items 08/17/2016 1 EA 1 0 0 0899 Underwater
1 EA 1 0 0 0Migrated Values
Notes: Diaphragm look good.
Protected Species 08/17/2016 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:
Inspector's Signature Reviewer's Signature
Inventory Notes:
Probed on 11-03-2003. No scour found. SOME TRANVERSE UNDERDECK CRACKING IN CENTER SPAN. Probed forscour-none found. West approach panel and exp. joint need repair.Inspected on 12-10-2007 by Tony Ridlon and Gary Vangen. pier cap cracking was noted. Erosion issue fixed 2015. Inspectedby Tony Ridlon, 2008, 2009, 2011, 2013, 2015. Revisited last summer, 2008-2015.
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:
[2015] Crews resealed deck cracks, sealed and patched deck / approach panel joint areas, no other issues. [2009-2013]Isolated deterioration, mainly at end of deck joint. [2008] Some transverse cracking in center span. Saw cut cracks andepoxied same in 2003. Crack repairs look good.
some vertical cracks
No issues
[2015] No changes since last inspection. [2010- 2013] We drilled Artesian relief holes in two of the piles on the East Pier, theiris evidence of water coming out of a few of them now, otherwise their is no changes of the cracks in pier cap. [2007-2009]couple minor vertical cracks in substructures.[2016 Underwater Inspection] - Changed to 6 due to loss of painted coating on piles.
[2015] looks to be more erosion sediment in channel from SE ditch drainage and repair issues. [2007-2013] SE drainage, ditcherosion, no major changes since last inspection.
ELEMNBR ELEMENT NAME INSP. DATE QUANTITY
QTYCS 1
QTYCS 2
QTYCS 3
QTYCS 4
BRIDGE 31533 CSAH 40 OVER BIG FORK RIVER
REPORT TYPE
Page 10 of 15
Photo 2 - View of West Abutment, looking west.
Photo 3 - View of East Abutment, looking east.
Pictures
Page 11 of 15
Pictures
Photo 4 - View of Pier 1, looking east.
Photo 5 - View of Pier 2, looking west.
Page 12 of 15
Pictures
Photo 6 - View of erosion at Southeast Embankment, looking south.
Page 13 of 15
Figure No.: 1
Scale: NTS
Legend
N
SOUNDING PLAN
UNDERWATER BRIDGE INSPECTION
DEPARTMENT OF TRANSPORTATION
MINNESOTA
INSPECTION AND SOUNDING PLAN
TYPICAL END VIEW OF PIERS
(Typ.)
Shoreline
Sounding Depth (8/03/16)
Flo
wWest Abutment
East Abutment
Pier 2Pier 1
Riprap
2
4
3
-2.0
-2.1 -3.3 -6.0 -6.0 -3.9
-3.5-3.0
-1.5 -5.5 -7.4 -7.4
Concrete Pile
16" Diameter Steel Encased
Concrete Pile
Battered 16" Diameter Steel Encased
Drawn By: JCG
Checked By: RAF
Date: 8/02/2016
DISTRICT 1, ITASCA COUNTY
OVER THE BIG FORK RIVER
STRUCTURE NO. 31533
between the substructure units.
4. Soundings were taken parallel to the bridge at 1/4 point intervals
measured in feet. All soundings are based on 2016 waterline location.
3. Soundings indicate the water depth at the time of inspection and are
assumed reference the waterline elevation was 88.2
available a reference elevation of 100.0 was assumed. Based on the
end of Pier 1. Since insufficient bridge elevation information was
located approximately 11.8 feet below the top of pier cap at upstream
2. At the time of inspection on August 2, 2016, the waterline was
1. Piers 1 and 2 were inspected underwater.
GENERAL NOTES:
Big Fork
River
5
5
1
4
5 A log, 1 foot diameter by 20 feet long, was observed from channel bottom up 1 foot.
bottom and 25% loss of painted coating from 1 foot above waterline to top of piles.
4 All steel piles had 100% loss of painted coating from 1 foot above waterline to channel
and 12 inches of maximum probe rod penetration.
3 The channel bottom at Pier 2 consisted of 12 inch diameter cobbles with gravel infill
maximum probe rod penetration.
2 The channel bottom at Pier 1 consisted of silt, sand, and gravel with 3 inches of
1 The southeast embankment had 7 foot wide by 6 foot deep errosion gully.
INSPECTION NOTES:
(Typ.)
Shoreline
63-9687 Figure No.: 1
UNDERWATER BRIDGE INSPECTION
DEPARTMENT OF TRANSPORTATION
MINNESOTA
Checked By: Scale:
Drawn By: Date:
www.collinsengr.com
(651) 646-8502
St. Paul, MN. 55104
Suite 206
1599 Selby Ave.
Project: Page 14 of 15
Figure No.: 2
UNDERWATER BRIDGE INSPECTION
DEPARTMENT OF TRANSPORTATION
MINNESOTA
UPSTREAM AND DOWNSTREAMFASCIA PROFILES
UPSTREAM FASCIA PROFILE
DOWNSTREAM FASCIA PROFILE
Refer to Figure 1 for General Notes.
Note:
~ W. Abutment ~ E. Abutment~ Pier 1 ~ Pier 2
~ W. Abutment ~ E. Abutment~ Pier 1 ~ Pier 2
Shoreline Shoreline
Shoreline
W.L. El. 88.2
W.L. El. 88.2
120
100
80
60
120
100
80
60
120
100
80
60
120
100
80
60
on 8/02/16
Channel Bottom
Scale: NTS
Date: 8/02/2016Drawn By: JCG
Checked By: RAF
Legend
Channel Bottom per 2016 Inspection
on 8/02/16
Channel Bottom
DISTRICT 1, ITASCA COUNTY
OVER THE BIG FORK RIVER
STRUCTURE NO. 31533
Shoreline
63-9687
UNDERWATER BRIDGE INSPECTION
DEPARTMENT OF TRANSPORTATION
MINNESOTA
Checked By: Scale:
Figure No.: 2
Drawn By: Date:
www.collinsengr.com
(651) 646-8502
St. Paul, MN. 55104
Suite 206
1599 Selby Ave.
Project: Page 15 of 15