BRIDGE # CSAH 2 over NOKASIPPI RIVER

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:

18512

CSAH 2 over NOKASIPPI RIVER

District 3 Crow Wing FORT RIPLEY

06/09/2016

Life Jacket, Probing Rod, Other - waders

Stromberg, Dan

Dan Stromberg

County Highway AgencyOwner:

MinnesotaSTATE:

enunez

Rectangle

UNDERWATER SUMMARY 3

UNDERWATER INSPECTION 4

UNDERWATER INSPECTION PROCEDURES 6

STRUCTURE INVENTORY 7

ELEMENTS 8

PHOTOGRAPHS 12

BRIDGE 18512 UNDERWATER INSPECTION DRAWINGS2016

14

TABLE OF CONTENTS

PAGE NUMBER

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 below water at Bridge No. 18512, Piers 1 and 2, were found to be in good to satisfactory condition with no defects of structural significance below water. The piles exhibited 25% to 50% coverage of surface corrosion, and rust nodules up to 1 inch diameter, with pitting up to 1/32 inch deep was present below water. The channel bottom around the substructure units appeared stable with no scour or other channel bottom deficiencies.

(A) From the channel bottom to 2 feet above the waterline 25% to 50% coverage of surface corrosion was present on all of the piles; below water rust nodules up to 1 inch in diameter and pitting up to 1/32 inch was also present.

(B) Riprap up to 1 foot in diameter was present at the abutments, however, the embankments at the structure were not well armored with only light riprap present on the east embankment.

(C) Minor erosion was present on both the upstream and downstream embankments with up to 3 foot vertical faces.

(D) The channel bottom material consisted of soft silt throughout with scattered riprap present around the middle of the piers allowing 2 feet of probe rod penetration.

(E) Light accumulations of timber debris with pieces up to 3 inches in diameter were present at the upstream and downstream piles of Pier 1 and the upstream pile of Pier 2.

INSPECTION FINDINGS

Page 3 of 15

The top of the pier cap at the downstream end of Pier 2.Water Level Reference:

WATERLINE DATUM

Waterline Elevation (feet):

The waterline was located approximately 11.0 feet below the reference.Description:

89.0 feet

4.

Piers 1 and 2Substructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

3.0 feetMaximum Water Depth at Substructure(s) Inspected (feet):

Piers 1 and 2 consist of a single line of five cast-in-place concrete piles encased in steel shells supporting a reinforced concrete cap.

Code:Item 62: Culvert:

6

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 3District:

CSAH 2

County:

The superstructure consists of three spans of timber deck. The superstructure is supported by two reinforced concrete abutments and two pier bents with concrete piles encased in steel shells supporting a common concrete cap. The piers are numbered 1 and 2 starting from the west end of the bridge.

Bridge Description:

018 - Crow Wing

Facility Carried:

BRIDGE DATA1.


Bridge #:

NOKASIPPI RIVERFeature Intersected:

18512

Underwater Visibility (feet):

Partly Cloudy, 75°FWeather Conditions:

0.5 feet

3.

0.5 ft/secWaterway Velocity (ft/sec):

06/09/2016

Professional Engineer/Team Leader:

INSPECTION DATA2.

Daniel G. Stromberg

Date of Underwater Inspection:

Daniel G. StrombergInspection Diver:

Page 4 of 15

885 Scour 1 EA 1

STRUCTURAL ELEMENT CONDITION RATING

Conditions

6.

I

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 or CIP Piling 1010 EA

CS2ELEM # Unit CS1Element Description Quantity

Page 5 of 15

The routine underwater inspection of Bridge 18512 (CSAH 2 over Nokasippi River) was completed on June 9, 2016. The underwater inspection was conducted from shore. The inspection was conducted by a team consisting of a Professional Engineer Diver with a valid MnDOT Team Leader certification, a backup diver and dive tender. Due to waterway conditions at the time of the inspection, the inspection could be accomplished by wading in accordance with OSHA regulations. Channel bottom 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 piers. According to the bridge inventory, Piers 1 and 2 are founded on cast-in-place concrete piles encased in steel shells supporting a reinforced concrete cap. Inspection procedures followed FHWA guidance and the MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for foundations. The maximum 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


Page 6 of 15

Spec. Feat.Pier Foundation (Material/Type)

8 - CIPCantilever ID

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

4 - PILE BENT

UnderwaterCulvert Type 3 - FTG PILE

Pinned Asbly.

06/09/2016

Barrel Length

93.3 ft. Navigation Control

Waterway Opening (sf.) 520Structure Length

ft. Year Painted

0 - No nav. control on waterwayDeck Width (Out-to-Out) 37.3

+ P A I N T +

APPR: 0 TOTAL:5 - Not eligible

MAIN: 3

Main Span Length 30.7 ft.Drainage Area (sq. mi.) 186.0

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 7 - Timber Median Width On Bridge

ft. Bridge Railing 0 - SUBSTANDARD

0 - SUBSTANDARD

Main Span Design 09 - Slab Span

ft. GR Transition

Skew 0

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 10/18/20133380 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) 3480 sq. ft.

DBL:VEH: SEMI:

Rt 06 ARail Type Lt 06 C N - N/AN - N/A B N - N/A

N - Not Applicable Overweight Permit CodesCurb Height Lt

ft. Horizontal 0 - Not Required

1.00 ft. Vertical1.00 ft. Rt

Wear Surf Install Year 2006

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

I - LOW RISK Year 1991Primer Type MN Scour Code

Painted Area

Unsound Paint % Nav. Clr. (ft.)Deck Material 8 - Wood or Timber 0.0Wear Surf Type 6 - Bituminous

Vert. 0.0 Horiz.

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

N - Not Applicable (no deck) + B R I D G E

Inventory Rating 2 - HS TRUCK 25.4

36.1Deck Rebars Install Year 1984

Deck Rebars

Finish TypeWear Course/Fill Depth 0.25 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

46 ° 12

Inspector Name Stromberg, Dan

Latitude Control Section (TH Only) Status' 2.08 ''

2 - 2-way traffic

Routine Inspection Frequency 24

Sect., Twp., Range

2.3 MI E OF JCT TH 371 Level of Service 1 - MAINLINE

- 32W Roadway Type24 - 043N

Detour Length 5.0 mi.R A T I N G S +

Custodian 02 - County Highway Agency

Owner 02 - County Highway AgencyDeck 6 Unsound

Deck %

C O N D I T I O N° 19 '

A - Open

Longitude 94 002+00.300 + N B I 4.31 '' Reference Point

Crew

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

Agency Br. No. 58

District 03

Bridge Match ID (TIS) 0 Userkey

CSAH 2 over NOKASIPPI RIVER

Minnesota Structure Inventory Report

Bridge ID: 18512

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

Date: 08/17/2016

Sufficiency Rating 98.9Roadway Name or Description

2

City

Routine Inspection Date 10/15/2014

Desc. Loc.

Township 18008 - FORT RIPLEY CSAH 2

Number

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

NRoute Sys 04 - CSAHCounty 018 - Crow Wing Functionally Obsolete

Lanes

Waterway Adequacy 9Max. Vert. Clear.

ft.Legislative District 12Bft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 36.20 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 36.2

36.0 ft.

Service Under

ft.

ft. Approach Alignment 9Horizontal Clear.

ft.

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

HCADT ADTT7

Year Built 1984

MN Year Reconstructed Functional Class

%Channel 6

Substructure

0Superstructure 6

ON 2 UNDER

267 YEAR 2008BMU Agreement ADT

Structure Evaluation 6If Divided

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

7/1/1985Deck Geometry 8

NB-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 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:

Crow Wing

18008 - FORT RIPLEY

043N24 32W

7 - Wood or Timber 1 - Slab

6 6 7 6 N

9 9

0 - Not Required

0 - Not Required

0 - Not Required

N - Not Applicable

I - LOW RISK

2.3 MI E OF JCT TH 371

04 - CSAH 2 002+00.300

93.3

37.3

3380 sq. ft. / %

sq. ft. / %

N/A

A - Open

ft.

ft.

Postings:List:

MINNESOTA BRIDGE INSPECTION REPORT

09/23/2016

Inspector: CO Bridge

BRIDGE 18512 CSAH 2 OVER NOKASIPPI RIVER

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 98.9

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Timber Slab 08/17/2016 3480 SF 3480 0 0 054 Underwater

3480 SF 3480 0 0 0Migrated Values

Notes: [2016] Migrator assumed CS1.

510 - Wearing Surfaces 3380 SF 3312 0 68 0

Notes: 10/15/14: There are new unsealed cracks present over the piers 2-3 feet in diameter potholes pending along side the pier joints. Thereare some longitudinal crack in the wheel paths throughout. Gaps of 1/4" or less found in isolated areas of the panels between the laminatesdirectly below the longitudinal cracks in the bituminous above.10/26/12: Some longitudinal cracks showing up in the wheel paths of the center span and the west span. All cracks have been sealed. Gapsof 1/4" or less found in isolated areas of the panels between the laminates directly below the longitudinal cracks in the bituminous above.09/23/08: AC was replaced in 2006. Rides good. One longitudinal crack in the center span.11/13/06: Old AC remover & New AC placed in kind in summer 2006.09/24/04: AC OVERLAY HAS FLEXURE CRACKS LONGITUDINALLY AND TRANSVERSELY WITH LARGE CRACKS OVER THE PIERS.BRIDGE IS IN NEED OF A NEW BITUMINOUS OVERLAY. WATER IS COMING THROUGH THE DECKING EVERY 6 TO 8 FEET. ACOVERLAY HAS CRACKS LONGITUDINALLY AND TRANSVERSELY WITH LARGE CRACKS OVER PIERS. BRIDGE IS IN NEED OF ANEW OVERLAY. WATER IS ENTERING DECKING EVERY 6 TO 8 FEET.[2000] Numerous cracks in overlay

Underwater 08/17/2016


Timber Floor Beam 08/17/2016 226 LF 152 74 0 0156 Underwater

226 LF 152 74 0 0Migrated Values

Notes: 10/15/14 - 10/26/12: Center span stiffener beam needs to be tightened.10/12/10: Center span stiffener beam needs to be tightened.

Reinforced Concrete Abutment 08/17/2016 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).

Wingwall notes:

Steel Pile 08/17/2016 10 EA 0 10 0 0225 Underwater

10 EA 0 10 0 0Migrated Values

Notes: 10/15/14 - 10/26/12: There is a 25% paint failure over all on all of the piles. There is heavy staining and minor rusting on the lower 3 to4 feet of all the piles. There is no significant section loss of the steel shell occurring at this time.10/12/10: There is a 25% paint failure over all on all of the piles. There is heavy staining and minor rusting on the lower 3 to 4 feet of all thepiles. There is no significant section loss of the steel shell occurring at this time.09/23/08: Less then 2% paint failure. No significant section loss is occurring. Heavy staining on the lower 4'.[2000] Need paint

515 - Steel Protective Coating 999 SF 999 0 0 0

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

Underwater 08/17/2016


Page 8 of 15

Reinforced Concrete Pier Cap 08/17/2016 75 LF 75 0 0 0234 Underwater


Notes: 10/15/14 - 09/23/08: Minor vertical crack found at the piling.

Timber Bridge Railing 08/17/2016 187 LF 187 0 0 0332 Underwater


Notes: 10/15/14: Inventory has been updated.10/12/10: Bridge railing is substandard and inventory needs to be updated. The railing measures 28" from the top of the bit to the top of thebridge railing and 30" from the top of the wood deck to the top of the bridge railing.

Critical Deficiencies or Safety Hazards 08/17/2016 1 EA 1 0 0 0800 Underwater


Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION.

Bituminous Approach Roadway 08/17/2016 2 EA 2 0 0 0822 Underwater


Notes: 10/15/14: The ride remains in good condition across the bridge, but cracking in the bituminous surfacing needs sealing.11/13/06: New in 2006.

Concrete Shear Cracking 08/17/2016 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 08/17/2016 1 EA 0 1 0 0885 Underwater


Notes: 10/15/14: Trees up stream are tipping into the river. The banks up-steam & down-stream are slumping. Looks like the river has cut anew channel 1000' up-stream leaving a large sand hill in the middle of the river. The river appears to be turning against the east revetmentslope during high water events, and there appears to be some erosion occurring. Cracking was found in the upper east revetment 5' to 6' infront of the east abutment.09/23/08: The banks up-steam & down-stream are slumping. Looks like the river has cut a new channel 1000' up-stream leaving a large sandhill in the middle of the river. Scour is present but is no threat to the bridge or road at this time.

Other Bridge Signing 08/17/2016 1 EA 1 0 0 0891 Underwater


Notes: [2000]

Slopes & Slope Protection 08/17/2016 1 EA 0 1 0 0892 Underwater


Notes: 10/15/14: The stream appears to be turning against the east slope at high water and eroding the lower slope. The rip rap is missing onthe E slope from top to bottom under the driving lanes and on the lower 1/2 of the slope on the W side. The W side may be under silt?10/26/12: The rip rap is missing on the E slope from top to bottom under the driving lanes and on the lower 1/2 of the slope on the W side. TheW side may be under silt?09/23/08: The rip rap is missing on the E slope from top to bottom under the driving lanes and on the lower 1/2 of the slope on the W side. TheW side may be under silt?11/13/06: Rip Rap is missing from around the abutments and needs to be replaced.09/24/04: THE RIP RAP SLOPE PROTECTION ON THE 1:2 BACK SLOPES AT BOTH ABUTMENTS HAS BEEN VANDALIZED. ABOUT 75%OF THE ROCK IS MISSING FROM THE UPPER AREAS OF THE BACK SLOPES OF BOTH ABUTMENTS.

Guardrail 08/17/2016 1 EA 1 0 0 0893 Underwater


Notes: 10/15/14: The transition is substandard. The concrete connection block over the abutment is not large enough. There is a loose bridgeto rail connection at the NW corner.10/12/10: The transition is substandard. The concrete connection block over the abutment is not large enough. Need to change the inventory.11/13/06: Guardrail has been repaired and new end treatments installed. 10/23/2002: TWO POSTS ARE FIRE DAMAGED AND NEEDREPLACEMENT. [2000] Need to replace sloping guardrail


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 9 of 15

Deck & Approach Drainage 08/17/2016 1 EA 1 0 0 0894 Underwater


Notes:

Sidewalk, Curb, & Median 08/17/2016 1 EA 1 0 0 0895 Underwater


Miscellaneous Items 08/17/2016 1 EA 1 0 0 0899 Underwater


Notes: 10/15/14: Some minor brushing could be done. Need to look at replacing lost rip-rap on the bridge slopes and tighten the centerspreader beam.10/12/10: Brushing has been done. Need to look at replacing lost rip-rap on the bridge slopes and tighten the spreader beams.09/23/08: Need to remove trees and brush from under the bridge. They are 10'-12' tall.

Protected Species 08/17/2016 1 EA 1 0 0 0900 Underwater


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

General Notes: 10/15/14: Was able to walk under the bridge and wade around the piers today. There is old beaver activity and dead headssunken in the river channel under and in front of the east pier piling. Missing 75% to 80% of the rip-rap on the east slope.Found cracks in the east revetment slope 5' to 6' in front of the east abutment.10/26/12: Was able to walk under the bridge and see all elements. Water is higher than usual. There has been beaveractivity at the bridge site. There is a dam 4 to 5 hundred feet down stream of the bridge. Not effecting the bridge at this time.The center span spreader beam needs to be tightened. Some minor slope erosion is occurring from bridge run off. Would notbe a problem if rip-rap where in place.10/12/10: Was able to walk under the bridge and see all elements. The center span spreader beam needs to be tightened.Some minor slope erosion is occurring from bridge run off. Would not be a problem if rip-rap where in place.09/23/08: Was able to walk under the bridge and see all elements. The spreader beams appears to be tight. There is someminor erosion occurring under the bridge from the deck run off.11/13/06: Was able to walk under the bridge and clearly see all components. The spreader beams were tightened on01/04/07. All deck boards are in good shape, was able to see when bit was replaced in summer 2006. No StructuralProblems Apparent.09/24/2004: THE AC OVERLAY HAS FLEXURE CRACKS LONGITUDINALLY AND TRANSVERSELY WITH LARGECRACKS OVER THE PIERS. THE CRACKS ARE IRREGULAR WITH 2 OR 3 ADDITIONAL CRACKS ROUGHLYPARALLEL EACH SIDE OF THE MAIN CRACK. THEY GIVE THE IMPRESSION THAT THE AC OVERLAY IS SERIOUSLYDETERIORATING. THE MAIN CRACKS AND THOSE CRACKS RUNNING PARALLEL RETAIN WATER AFTER RAINFALLAND SNOW MELT. THIS WILL HASTEN DETERIORATION OF THE ASPHALT MAT DURING FREEZE-THAW CYCLESTHIS WINTER. THE RIP RAP SLOPE PROTECTION ON THE 1:2 BACK SLOPES AT BOTH ABUTMENTS HAS BEENVANDALIZED. ABOUT 75% OF THE ROCK IS MISSING FROM THE UPPER AREAS OF THE BACK SLOPES OF BOTHABUTMENTS.2002-10-23: SMART FLAG!! DECK CRACKING: CONDITION STATE 2, MODERATE DENSITY.Previous comments > *BITUMINOUS OVERLAY HAS TRANSVERSE AND LONGITUDINAL CRACKS AT ABOUT 8 FOOTCENTERS. THIS IS NOT A NEW DEVELOPMENT. CLEARANCE MARKERS AND MARKER PLATES ARE IN PLACE. 1998Burned out post - guardrail - SW guardrail. Remove brush. Bituminous surfacing has severe cracking. Water is running downthrough deck on ? and East side. [2000] Need to trim brush

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:

Some longitudinal cracks developing in the wheel paths over the center and west spans. All cracks have been sealed.

Speeds greater than 40 MPH. Current railing (code 06) only meets TL-2 crash testing.

Bridge end post is shorter than 3 feet.

Debris against the upstream piling of the east pier. Trees are tipping into the river upstream and downstream.


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 10 of 15


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Inspector's Signature Reviewer's Signature

Inventory Notes:

72. Appr RoadwayAlignment NBI:

Page 11 of 15

Photo 1 - Upstream Fascia, Looking Southwest

Photo 2 - Downstream Fascia, Looking Northwest

Pictures

Page 12 of 15

Pictures

Photo 3 - Pier 1, Looking Northwest

Photo 4 - Pier 2, Looking Northeast

Page 13 of 15

Legend

SOUNDING PLAN

UNDERWATER BRIDGE INSPECTION

DEPARTMENT OF TRANSPORTATION

MINNESOTA

INSPECTION AND SOUNDING PLAN

Flo

w

Cast-In-Place Concrete Pile

TYPICAL END VIEW OF PIER

Pier 1

Timber Debris

Sounding Depth (6/9/16)

CHECKED BY: DGS

123 North Wacker Drive

Suite 900

Chicago, Il. 60606

(312) 704-9300

www.collinsengr.com

DRAWN BY: ELN

Code: 968718512

1

DATE: JUNE 9, 2016

SCALE: NTS

FIGURE NO.: 1

DISTRICT 3, CROW WING COUNTY

OVER NOKASIPPI RIVER

STRUCTURE NO. 18512

(Typ.)

Shoreline

-1.2

29'-10•" 30'-9" 29'-10•"

N

West Abutment East Abutment

Pier 2

-4.0 -3.9 -3.4 -2.2

-1.5 -4.0-4.2 -3.2 -2.2

-1.0 -3.0 -1.5

River

Nokasip

pi

-2.2

Battered Pile

Cast-In-Place Concrete

2

2

2

Pier 2.

present at the upstream and downstream piles of Pier 1 and the upstream pile of

Light accumulations of timber debris with pieces up to 3 inches in diameter were2

present around the middle of the piers allowing 2 feet of probe rod penetration.

The channel bottom material consisted of soft silt throughout with scattered riprap 1

INSPECTION NOTES:

units.

7. Soundings were taken parallel to the bridge at 1/4 point intervals between the substructure

6. Soundings indicate the water depth at the time of inspection and are measured in feet.

and pitting up to 1/32 inch was also present.

corrosion was present on all of the piles; below water rust nodules up to 1 inch in diameter

From the channel bottom to 2 feet above the waterline 25% to 50% coverage of surface 5.

to 3 foot vertical faces.

Minor erosion was present on both the upstream and downstream embankments with up 4.

the structure were not well armored with only light riprap present on the east embankment.

Riprap up to 1 foot in diameter was present at the abutments, however, the embankments at3.

Based on the assumed reference the waterline elevation was 89.0.

bridge elevation information was available, a reference elevation of 100.0 was assumed.

11.0 feet below the top of pier cap at downstream end of Pier 2. Since insufficient

At the time of inspection on June 9, 2016, the waterline was located approximately2.

1. Pier 1 and 2 were inspected underwater.

GENERAL NOTES:

Page 14 of 15

UNDERWATER BRIDGE INSPECTION

DEPARTMENT OF TRANSPORTATION

MINNESOTA

UPSTREAM AND DOWNSTREAMFASCIA PROFILES

UPSTREAM FASCIA PROFILE

DOWNSTREAM FASCIA PROFILE

~ Pier 1

Shoreline

on 6/9/16

Channel Bottom

123 North Wacker Drive

Suite 900

Chicago, Il. 60606

(312) 704-9300

www.collinsengr.com

DRAWN BY: ELN

CHECKED BY: DGS

Code: 968718512

DISTRICT 3, CROW WING COUNTY

OVER NOKASIPPI RIVER

STRUCTURE NO. 18512

DATE: JUNE 9, 2016

SCALE: 1"=10'

FIGURE NO.: 2

29'-10•" 30'-9" 29'-10•"

~ Brg. W. Abut. ~ Pier 2 ~ Brg. E. Abut.

(Assumed)

T/Cap El. 100.0

Shoreline

100.0

90.0

80.0

100.0

90.0

80.0

W.L. El. 89.0

~ Pier 1

Shoreline

29'-10•" 30'-9" 29'-10•"

~ Brg. W. Abut. ~ Pier 2 ~ Brg. E. Abut.

(Assumed)

T/Cap El. 100.0

Shoreline

100.0

90.0

80.0

100.0

90.0

80.0

W.L. El. 89.0

Refer to Figure 1 for General Notes.

Note:

on 6/9/16

Channel Bottom

Page 15 of 15

Documents

BRIDGE # CSAH 2 over NOKASIPPI RIVER