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:

L8160

MUN 31(GENEVA AV) over GREY CLOUD CHANNEL

Metro Washington Cottage Grove

10/14/2016

Stuber, Cory

Cory Stuber

City or Municipal Highway AgencyOwner:

MinnesotaSTATE:

UNDERWATER SUMMARY 3

UNDERWATER INSPECTION 4

UNDERWATER INSPECTION PROCEDURES 6

STRUCTURE INVENTORY 7

ELEMENTS 8

PICTURES 10

DRAWINGS 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 of Bridge No. L8160, single reinforced concrete barrel, were found to be in satisfactory condition with areas of spalling and minor scaling. Two spalls were noted on the southeast wingwall with up to a 2 inch depth. The channel bottom was observed to be in satisfactory condition, consisting of a sandy infill with random cobbles.

(A) Channel bottom material consisted of sandy infill with random cobbles, up to a 12 inch diameter.

(B) Minor scaling, up to 1/4 inch deep, on both interior barrel walls was observed at the waterline extending to approximately 1 foot below.

(C) Two spalls observed on the southeast wingwall, measuring 1 square foot with a maximum 2 inch depth.

INSPECTION FINDINGS

Page 3 of 15

Top of the headwall on the north barrel opening.Water Level Reference:

WATERLINE DATUM

Waterline Elevation (feet):

Waterline was located approximately 7.5 feet below assumed reference elevation of 100 feet.Description:

92.5

4.

Box culvert barrelSubstructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

4.8Maximum Water Depth at Substructure(s) Inspected (feet):

The barrel consists of a 10 foot wide by 10 foot high box culvert.

Code:Item 62: Culvert:

7

6

Y 48 10/2016Code: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:

Code:

MetroDistrict:

MUN 31(GENEVA AV)

County:

The structure consists of a single barrel concrete box culvert.

Bridge Description:

082 - Washington

Facility Carried:

BRIDGE DATA1.

UNDERWATER INSPECTION

Bridge #:

GREY CLOUD CHANNELFeature Intersected:

L8160

Underwater Visibility (feet):

Sunny, 55°FWeather Conditions:

2.0

3.

5.0Waterway Velocity (ft/sec):

10/14/2016

Professional Engineer/Team Leader:

INSPECTION DATA2.

Cory Stuber P.E.

Date of Underwater Inspection:

Garritt Owens P.E.Inspection Diver:

Page 4 of 15

Concrete Culvert 26241 LF 26

885 Scour 1 EA 1

1

STRUCTURAL ELEMENT CONDITION RATING

Conditions

6.

E

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

870

CS3 CS4

Culvert End Treatment 12 EA

CS2ELEM # Unit CS1Element Description Quantity

Page 5 of 15

The routine underwater inspection of Bridge L8160 (MUN 1(Geneva Ave.) over Grey Cloud Channel) was completed on October 14, 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. 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 single barreled concrete box culvert. According to the bridge inventory or design drawings, the barrel was 10 feet wide by 10 feet high. 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

UNDERWATER INSPECTION

Page 6 of 15

Spec. Feat.Pier Foundation (Material/Type)

N - N/ACantilever ID

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

N - N/A

Underwater 60Culvert Type W1010 N - N/A

Pinned Asbly.

10/14/2016

Barrel Length 26

12.2 ft. Navigation Control

Waterway Opening (sf.) 100Structure Length

ft. Year Painted

0 - No nav. control on waterwayDeck Width (Out-to-Out) 0.0

+ P A I N T +

APPR: 0 TOTAL:5 - Not eligible

MAIN: 1

Main Span Length 10.0 ft.Drainage Area (sq. mi.)

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 0 - SUBSTANDARD

Appr. Guardrail

Main Span Type 1 - Concrete Median Width On Bridge

ft. Bridge Railing 0 - SUBSTANDARD

1 - MEETS STANDARDS

Main Span Design 13 - Box Culvert

ft. GR Transition

Skew 0

Y/N Freq Date

Abutment Foundation (Material/Type)

N - N/A 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 2/1/1992sq. 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) 0 sq. ft.

DBL:VEH: SEMI:

Rt 02 ARail Type Lt 02 C N - N/AN - N/A B N - N/A

N - Not Applicable Overweight Permit CodesCurb Height Lt

ft. Horizontal 1 - Object Markers

0.33 ft. Vertical0.33 ft. Rt

Wear Surf Install Year

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

E - CULVERT Year 1990Primer Type MN Scour Code

Painted Area

Unsound Paint % Nav. Clr. (ft.)

!

Deck Material N - Not Applicable 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 18.0

24.0Deck Rebars Install Year

Deck Rebars

Finish TypeWear Course/Fill Depth 0.38 ft.

N - Not Applicable (applies only to structures with no dec Design Load 0 - Other/Unknown

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

44 ° 47

Inspector Name Stuber, Cory

Latitude Control Section (TH Only) Status' 36.67 ''

2 - 2-way traffic

Routine Inspection Frequency 24

Sect., Twp., Range

0.9 MI SE OF JCT CR75 Level of Service 1 - MAINLINE

- 21W Roadway Type30 - 027N

Detour Length 6.0 mi.R A T I N G S +

Custodian 04 - City or Municipal Highway Agency

Owner 04 - City or Municipal Highway Agency

Deck N Unsound Deck %

C O N D I T I O N° 58 '

A - Open

Longitude 92 000+00.280 + N B I 57.08 '' Reference Point

Crew

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

Agency Br. No. 145

District 05

Bridge Match ID (TIS) 0 Userkey

MUN 31(GENEVA AV) over GREY CLOUD CHANNEL

Minnesota Structure Inventory Report

Bridge ID: L8160

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

Date: 01/31/2017

Sufficiency Rating 97.1Roadway Name or Description

31

City Cottage Grove

Routine Inspection Date 09/15/2016

Desc. Loc.

Township MUN 31

Number

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

NRoute Sys 10 - MUNCounty 082 - Washington Functionally Obsolete

Lanes

Waterway Adequacy 6Max. Vert. Clear.

ft.Legislative District 57Aft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 24.20 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 0.0

24.0 ft.

Service Under

ft.

ft. Approach Alignment 7Horizontal Clear.

ft.

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

HCADT ADTTN

Year Built 1930

MN Year Reconstructed Functional Class

%Channel 7

Substructure

0Superstructure N

ON 2 UNDER

412 YEAR 1978BMU Agreement ADT

Structure Evaluation 6If Divided

D I M E N S I O N S +Bridge Plan Location 0 - NO PLAN

Deck Geometry NNB-EB SB-WBDate Opened to Traffic

+ R D W Y

FHWA Year Reconstructed

MN Temporary Status

07 - Rural - Major CollectorCulvert 6

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:

Washington

Cottage Grove

027N30 21W

1 - Concrete 19 - Culvert (includesframe culverts)

N N N 7 6

7 6

0 - Not Required

1 - Object Markers

0 - Not Required

N - Not Applicable

E - CULVERT

0.9 MI SE OF JCT CR75

10 - MUN 31 000+00.280

12.2

0.0

sq. ft. / %

sq. ft. / %

W1010

A - Open

ft.

ft.

Postings:List:

MINNESOTA BRIDGE INSPECTION REPORT

02/01/2017

BRIDGE L8160 MUN 31(GENEVA AV) OVER GREY CLOUD CHANNEL

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 97.1

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Reinforced Concrete Culvert 01/31/2017 26 LF 0 26 0 0241 Underwater

09/15/2016 26 LF 0 26 0 0Routine

Notes: [2010-2014]: No change in culvert cracking01/09/2008: Minor cracking and deterioration of the culvert[2016] Could not enter barrel of culvert in 2016 due to deep, fast flowing water.[2016] Underwater Inspection -- Minor scaling, up to 1/4 inch deep, on both interior barrel walls was observed at the waterline extending toapproximately 1 foot below.

Metal Bridge Railing 01/31/2017 24 LF 24 0 0 0330 Underwater

09/15/2016 24 LF 24 0 0 0Routine

Notes: [2014] City installed six guardrail posts (3 per side).[2010-2012]: Missing guardrail post on each side of roadway over culvert. A timber post should be installed on the metal culvert bracket andattached to the guardrail.[2016] Functioning as designed.

515 - Steel Protective Coating 24 SF 24 0 0 0

Notes: [2016] No significant deficiencies.

Underwater 01/31/2017

24 SF 24 0 0 0Routine 09/15/2016

Timber Bridge Railing 01/31/2017 24 LF 24 0 0 0332 Underwater

09/15/2016 24 LF 24 0 0 0Routine

Notes: [2014] City installed six guardrail posts (3 per side).[2010-2012]: Missing guardrail post on each side of roadway over culvert. A timber post should be installed on the metal culvert bracket andattached to the guardrail.[2016] Functioning as designed.

Critical Deficiencies or Safety Hazards 01/31/2017 1 EA 1 0 0 0800 Underwater

09/15/2016 1 EA 1 0 0 0Routine

Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION.[2016] No critical findings.

Culvert End Treatment 01/31/2017 2 EA 0 1 1 0870 Underwater

09/15/2016 2 EA 0 1 1 0Routine

Notes: 01/09/2008: City installed riprap at ends of wingwall.01/09/2006: Minor spalls and deterioration of wingwalls.01/09/2008: City installed riprap at ends of wingwall.

[2010-2012]: City installed grout in space between back face of concrete wingwalls and the sheeting. East headwall has map cracking andefflorescence, not structural at this time. Minor deterioration at the culvert inlet wingwalls.[2014] Wingwalls repaired by removal of unsound concrete, cleaning of the rebar, and installation of concrete patching.[2016] Wingwalls in good condition. Minor abrasion at waterline.[2016] Underwater Inspection -- Two spalls observed on the southeast wingwall, measuring 1 square foot with a maximum 2 inch depth.

Page 8 of 15

Roadway Over Culvert 01/31/2017 1 EA 1 0 0 0871 Underwater

09/15/2016 1 EA 1 0 0 0Routine

Notes: [2016] Patch at southeast corner. Transverse cracking in approaches with random cracking over culvert.

Scour 01/31/2017 1 EA 1 0 0 0885 Underwater

09/15/2016 1 EA 1 0 0 0Routine

Notes: [2016] All (4) corners probed at end of aprons in 2016. 1 ft of scour at inlet, and 3 ft of scour at outlet.

Slopes & Slope Protection 01/31/2017 1 EA 1 0 0 0892 Underwater

09/15/2016 1 EA 1 0 0 0Routine

Notes: [2016] Approach embankments are well armored with rock and sheet piles at structure.

Deck & Approach Drainage 01/31/2017 1 EA 0 1 0 0894 Underwater

09/15/2016 1 EA 0 1 0 0Routine

Notes: [2008-2016] City installed grout between sheet piling and wingwalls. Moderate erosion at edge of roadway at northwest corner.

Protected Species 01/31/2017 1 EA 1 0 0 0900 Underwater

09/15/2016 1 EA 1 0 0 0Routine

Notes: [2016] None

General Notes:

Inspector's Signature Reviewer's Signature

01/09/2006: Roadway reconstruction has been completed. Sheet piling and armoring (riprap) has been installed at all fourcorners of the structure. Armoring has been provided for all channel slopes.[2016] Seal cracks in asphalt over structure and at approaches.

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:

[2012] Connection issues over culvert.[2014] City installed new guardrail connectors to top of culvert.

[2014] Wingwalls repaired by removal of unsound concrete, cleaning of the rebar, and installation of concrete patching.

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4

BRIDGE L8160 MUN 31(GENEVA AV) OVER GREY CLOUD CHANNEL

REPORT TYPE

Page 9 of 15

Photo 1 - South Elevation, Looking Northeast.

Photo 2 - North Elevation, Looking Southwest.

Pictures

Page 10 of 15

Pictures

Photo 3 - Inner Barrel View Upstream End, Looking Northwest.

Photo 4 - Inner Barrel Downstream View, Looking Southeast.

Page 11 of 15

Pictures

Photo 5 - Roadway View Over Culvert, Looking East.

Photo 6 - Upstream View, Looking North.

Page 12 of 15

Pictures

Photo 7 - Downstream View, Looking South.

Page 13 of 15

Page 14 of 15

Page 15 of 15