BRIDGE # CSAH 11 over SNAKE 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 38 Reinforced Concrete Slab Underwater

2017 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:

33527

CSAH 11 over SNAKE RIVER

District 3 Kanabec GRASS LAKE

04/07/2017

Stuber, Cory

Cory Stuber

County Highway AgencyOwner:

MinnesotaSTATE:

UNDERWATER SUMMARY 3

UNDERWATER INSPECTION 4

UNDERWATER INSPECTION PROCEDURES 6

STRUCTURE INVENTORY 7

ELEMENTS 8

PICTURES 12

DRAWING 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 at Bridge No. 33527, Piers 1 and 2, were found to be in good condition with no defects of structural significance observed. However, the protective coating/paint system has experienced a 10% loss of coverage throughout. A scour depression was observed around the upstream nose of Pier 1, with a 5 foot radius and a 3 foot depth. A large 24 inch diameter timber log has become wedged into the channel bottom extending up to the underside of the superstructure on the south side of Pier 1. Aside from localized scour around Pier 1, the channel bottom around the substructure units appeared stable, consisting of a sandy infill with random cobbles. This report represents the initial underwater inspection for this structure.

(A) The channel bottom consisted of sandy infill with random cobbles, up to 18 inches in diameter, starting 10 feet out from the shoreline.

(B) Typically, a 10% loss of coating was observed on the steel shells of the cast-in-place piles.

(C) A large timber log, with up to a 24 inch diameter, and other timber debris, up to 12 inch diameters, were observed accumulating on Pier 1 from the channel bottom extending up to the superstructure.

(D) Scour depression observed around the first pile on the upstream nose of Pier 1, with a 5 foot radius and a 3 foot depth.

INSPECTION FINDINGS

Page 3 of 15

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

WATERLINE DATUM

Waterline Elevation (feet):

The waterline was approximately 13.1 feet below reference.Description:

945.0

4.

Piers 1 and 2Substructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

7.4Maximum Water Depth at Substructure(s) Inspected (feet):

The piers consist of a reinforced concrete pier cap with rounded ends supported by seven cast-in-place concrete piles with steel casings (shells).

Code:Item 62: Culvert:

8

Y 48 04/2017Code: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 11

County:

The bridge superstructure consists of three spans. The superstructure is supported by two bent piers and two reinforced concrete abutments. Each pier is comprised of a reinforced concrete cap supported by seven steel encased cast-in-place piles. Substructure units were designated as follows: South Abutment, Piers 1 and 2, North Abutment.

Bridge Description:

033 - Kanabec

Facility Carried:

BRIDGE DATA1.


Bridge #:

SNAKE RIVERFeature Intersected:

33527

Underwater Visibility (feet):

Sunny, 45°FWeather Conditions:

3

3.

2.0Waterway Velocity (ft/sec):

04/07/2017

Professional Engineer/Team Leader:

INSPECTION DATA2.

Cory Stuber, P.E.

Date of Underwater Inspection:

Cory Stuber, P.E.Inspection Diver:

Page 4 of 15

885 Scour 1 1EA

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 Piling 1414 EA

CS2ELEM # Unit CS1Element Description Quantity

Page 5 of 15

The routine underwater inspection of Bridge 33527 (CSAH 11 over the Snake River) was completed on April 7, 2017. 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 and a dive tender. Due to waterway conditions at the time of inspection, the inspection could be accomplished by wading 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 steel pile bent piers. According to the bridge inventory or design drawings, Piers 1 and 2 were each founded on seven CIP 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


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.

04/07/2017

Barrel Length

185.6 ft. Navigation Control

Waterway Opening (sf.) 1950Structure Length

ft. Year Painted

0 - No nav. control on waterwayDeck Width (Out-to-Out) 43.3

+ P A I N T +

APPR: 0 TOTAL:5 - Not eligible

MAIN: 3

Main Span Length 60.2 ft.Drainage Area (sq. mi.) 3988.0

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 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 04/08/20157427 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) 8036 sq. ft.

40 DBL: 40VEH: 32 SEMI:

Rt 22 ARail Type Lt 22 C N - N/AN - N/A B N - N/A

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

YearPrimer Type MN Scour Code

Painted Area

Unsound Paint % Nav. Clr. (ft.)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 11.4

19.0Deck Rebars Install Year 1988

Deck Rebars

Finish TypeWear Course/Fill Depth 0.00 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 ° 48

Inspector Name Stuber, Cory

Latitude Control Section (TH Only) Status' 41.76 ''

2 - 2-way traffic

Routine Inspection Frequency 24

Sect., Twp., Range

0.4 MI S OF JCT CSAH 17 Level of Service 1 - MAINLINE

- 23W Roadway Type6 - 038N

Detour Length 12.0 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° 15 '

B - Open, Posting Required

Longitude -93+ N B I

57.35 '' Reference Point

Crew

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

Agency Br. No. 73

District 03

Bridge Match ID (TIS) 0 Userkey

CSAH 11 over SNAKE RIVER

Minnesota Structure Inventory Report

Bridge ID: 33527

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

Date: 05/11/2017

Sufficiency Rating 81.3Roadway Name or Description

11

City

Routine Inspection Date 11/20/2015

Desc. Loc.

Township 33006 - GRASS LAKE CSAH 11

Number

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

NRoute Sys 04 - CSAHCounty 033 - Kanabec Functionally Obsolete

Lanes

Waterway Adequacy 8Max. Vert. Clear.

ft.Legislative District 08Bft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 40.00 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 40.0

38.0 ft.

Service Under

ft.

ft. Approach Alignment 8Horizontal Clear.

ft.

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

HCADT ADTT7

Year Built 1988

MN Year Reconstructed Functional Class

%Channel 8

Substructure

0Superstructure 7

ON 2 UNDER

882 YEAR 2008BMU Agreement ADT

Structure Evaluation 5If Divided

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

11/1/1988Deck 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:

Kanabec

33006 - GRASS LAKE

038N6 23W

5 - Prestressed Concrete 2 -Stringer/Multi-beam or Girder

7 7 7 8 N

8 8

0 - Not Required

0 - Not Required

0 - Not Required

N - Not Applicable

N - STBL - LIM SCOUR

0.4 MI S OF JCT CSAH 17

04 - CSAH 11 005+00.197

185.6

43.3

7427 sq. ft. / %

sq. ft. / %

N/A

B - Open, PostingRequired

ft.

ft.

Postings: 32 40 40List:

MINNESOTA BRIDGE INSPECTION REPORT

05/15/2017

BRIDGE 33527 CSAH 11 OVER SNAKE RIVER

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 81.3

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Reinforced Concrete Slab 04/07/2017 8036 SF 8036 0 0 038 Underwater

8036 SF 8036 0 0 0Migrated Values

Notes: Concrete Slab with Bituminous Overlay Notes: [2016] Migrator assumed CS1.

510 - Wearing Surfaces 7427 SF 7278 0 149 0

Notes: Concrete Slab with Bituminous Overlay Notes: Several hairline cracks.2015: Spalls at joints.

Underwater 04/07/2017


Prestressed Concrete OpenGirder/Beam

04/07/2017 718 LF 718 0 0 0109 Underwater

718 LF 718 0 0 0Migrated Values

Notes: No change.

Reinforced Concrete Abutment 04/07/2017 125 LF 122 3 0 0215 Underwater


Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0).5 Vert. hairline cracks N. abut. some Efforvecence. 3 Vert. hairline cracks S. abut.2015:Spall between girders 3 & 4 E. abut.

Wingwall notes: No change.

Steel Pile 04/07/2017 14 EA 14 0 0 0225 Underwater

14 EA 14 0 0 0Migrated Values

Notes: Piling need to be painted.2015: Several need paint.

515 - Steel Protective Coating 999 SF 999 0 0 0

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

Underwater 04/07/2017


Reinforced Concrete Pier Cap 04/07/2017 85 LF 85 0 0 0234 Underwater


Notes: No change.

Strip Seal Expansion Joint 04/07/2017 43 LF 3 19 0 21300 Underwater


Notes: Gland on N. end of bridge has failed, & should be replaced.2015: No change.

Page 8 of 15

Pourable Joint Seal 04/07/2017 86 LF 0 86 0 0301 Underwater


Notes: Deck delamination over joints, repaired with Bit. patch.2015: No change.

Elastomeric Bearing 04/07/2017 16 EA 16 0 0 0310 Underwater


Notes: 2015: Good cond.

Fixed Bearing 04/07/2017 8 EA 8 0 0 0313 Underwater


Notes: No change.

Reinforced Concrete Bridge Railing 04/07/2017 371 LF 0 371 0 0331 Underwater


Notes: NW bolt sheared off expansion plate. Numerous hairline cracks, both rails. Slight impact damage.2015: Expansion plate still needs repair. Graffiti on rails, the should be painted.

Critical Deficiencies or Safety Hazards 04/07/2017 1 EA 1 0 0 0800 Underwater


Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION. None.

Bituminous Approach Roadway 04/07/2017 2 EA 0 2 0 0822 Underwater


Notes: 2015: Settlement at both ends of approaches at Br. They have been patched.

Secondary Members (Superstructure) 04/07/2017 18 EA 18 0 0 0855 Underwater


Notes: Steel diaphrams2015: Good cond.

Concrete Shear Cracking 04/07/2017 1 EA 1 0 0 0883 Underwater


Notes: 2015: None

Scour 04/07/2017 1 EA 0 1 0 0885 Underwater


Notes: Due to deep water unable to check for scour at piers.2015:Due to deep water unable to check for scour. Need to inspect for scour when water levels are low, use a boat.[2017] Underwater Inspection - Scour depression observed around the first pile on the upstream nose of Pier 1, with a 5 foot radius and a 3 footdepth.

Load Posting or Vertical ClearanceSigning

04/07/2017 1 EA 1 0 0 0890 Underwater


Notes: [2016] Structure requires a vertical clearance sign or load posting sign.

Other Bridge Signing 04/07/2017 1 EA 1 0 0 0891 Underwater


Notes: SE delin. has damaged face.04/08/2015: Load Posting Required: 32T/40T/40T. NBI 41: Status coded 'B - Open, Posting Required'. Agency to notify MnDOT BADMU whensigns are installed.2015: Load limit signs are inplace. Guardrail markers at ends.


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Page 9 of 15

Slopes & Slope Protection 04/07/2017 1 EA 0 1 0 0892 Underwater


Notes: Still need riprap both slopes.

Guardrail 04/07/2017 1 EA 1 0 0 0893 Underwater


Notes: 12' Impact damage, NW corner. 1 post needs to be replaced.

Deck & Approach Drainage 04/07/2017 2 EA 2 0 0 0894 Underwater


Notes: 2015: Good cond.

Protected Species 04/07/2017 1 EA 1 0 0 0900 Underwater


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

General Notes: PONTIS inspection comments -2001 inspection - structure remains in good condition. No problems noted during thisinspection. 2003 inspection - Structure is in good to very good condition. All concrete members of structure are sound.Superficial cracks in railing remain the same - no serious problems. Piers are in good condition; although there is a largeamount of debris to be removed from upstream end of south pier. Abutment slopes need riprap. Grafitti on beams andabutments should be covered with a coat of paint. 2005 All concrete in this pre-stressed concrete beam span structure is ingood condition. J-railing have minor expansion cracks in them. Bridge beams and abutments have grafitti painted on them thatshould be painted. All C-I-P pier piling are in good condition. Remove debris from upstream end of pier no. 1. Gland on northend of bridge has failed and should be repaired. Bituminous approaches and signs are in good condition. 2007 inspectionfound this structure to be in good condition. No change in overall condition. All concrete is sound. CIP pier piling are in goodcondition. Expansion cracks in conrete railings remains the same. Riprap needed on abutment slopes. Gland on expansionjoint on north end of bridge is leaking and should be replaced. Unable to inspect for scour at this time. Will complete inspectionin the spring and forward results to MN/DOT at that time. Signs and approaches are in good condition. 8-11-08 Found 3.0'deep scour on west end of south pier. Remoive debris and continue to monitor. 2009 - Strucutre is in good condition. Concreteslab has delamination oever pier joints. Debris on upstream end of pier 1 needs to be removed. J-railing has expansion cracksthroughout which remain the same. pier pilings are in good condition. All concrete members are sound.Abutment slopes stillneed riprap. Leaking gland on Norh end of bridge needs to be repaired.No change in scour since last inspection. ET-Plusguardrail is good. Signs okay.2011 - Structure is in good condition. Concrete deck has some minor delamination at joints over piers. Debris upstream andalong pier #1 needs to be removed. J-railing expansion cracks are the same as in 2009. Pier piling & piers are in goodcondition. Abutment slopes still need riprap. Guardrail is in good condition. Signs are all ok. Gland on north end still needsrepair.2013 - Structure is in good condition. North concrete diaphragm, 3 hairline cracks center & 3 east side. S. concretediaphragm, 1 hairline crack east side, and 1 W. side. Cracks w/ efforvesence deck underside over N. pier (W. side), also overS. pier. Debris in channel needs to be removed at W. end of S. pier. Bit. apps. have moderate dips at Br. ends, and patchesare breaking up.2015: Br. is in good cond., no changes since previous inspection. Due to high water unable to check for scour at piers.

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:

No change.

No change.2015: Spalls at joints.

No change.

No change.

No change.

No change.


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

Page 11 of 15

Photo 1 - East Elevation Looking Northwest

Photo 2 - West Elevation Looking Northeast

Pictures

Page 12 of 15

Pictures

Photo 3 - Pier 1 Looking North

Photo 4 - Pier 2 Looking South

Page 13 of 15

Page 14 of 15

Page 15 of 15

Documents

BRIDGE # CSAH 11 over SNAKE 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 38 Reinforced Concrete Slab Underwater