bridge # l6492 twp 129 over co ditch # 11, br #1

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:

L6492

TWP 129 over CO DITCH # 11, BR #1

District 3 Mille Lacs BORGHOLM

10/26/2016

Owens, Garrett

Garrett Owens

County Highway AgencyOwner:

MinnesotaSTATE:

UNDERWATER SUMMARY 3

UNDERWATER INSPECTION 4

UNDERWATER INSPECTION PROCEDURES 6

STRUCTURE INVENTORY 7

ELEMENTS 8

PICTURES 10

DRAWING 13

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 structure inspected at Structure No. L6492, two precast concrete arch pipe culverts, was found to be in generally good condition with no defects of structural significance observed. The concrete of the structure was generally smooth and sound. A 2 to 6 inch thick layer of silt typically covered the culvert floor.

(A) The floor of the culvert was typically covered with a 2 to 6 inch layer of silt.

(B) The concrete of both culvert pipes was sound with no defects of structural significance observed.

(C) The channel bottom material at the west and east openings was soft organic silt allowing up to 1.5 feet of probe rod penetration.

INSPECTION FINDINGS

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The ceiling of the south pipe barrel at the west opening.Water Level Reference:

WATERLINE DATUM

Waterline Elevation (feet):

The waterline was approximately 0.1 feet below assumed reference elevation of 100 feet.Description:

99.9

4.

Pipe CulvertSubstructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

4.5Maximum Water Depth at Substructure(s) Inspected (feet):

Two precast concrete arch pipe culverts.

Code:Item 62: Culvert:

7

7

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:

District 3District:

TWP 129

County:

The structure consists of two concrete arch pipe culverts with tapered wingwalls (precast end unit) at both openings.

Bridge Description:

048 - Mille Lacs

Facility Carried:

BRIDGE DATA1.


Bridge #:

CO DITCH # 11, BR #1Feature Intersected:

L6492

Underwater Visibility (feet):

Cloudy, 40° FWeather Conditions:

0.0

3.

0.0Waterway Velocity (ft/sec):

10/26/2016

Professional Engineer/Team Leader:

INSPECTION DATA2.

Garret R. Owens, P.E.

Date of Underwater Inspection:

Garret R. Owens, P.E.Inspection Diver:

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Scour 1885 EA 1

870 Culvert End Treatments 4 EA 4

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

241

CS3 CS4

Reinforced Concrete Culvert 180180 LF

CS2ELEM # Unit CS1Element Description Quantity

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The routine underwater inspection of Bridge L6492 (TWP 129 over County Ditch #11) was completed on October 26, 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 a two barreled concrete arch pipe culvert. According to the bridge inventory or design drawings, the barrels were approximately 7 feet wide and 4.5 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


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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 88"X54" N - N/A

Pinned Asbly.

10/26/2016

Barrel Length 90

20.4 ft. Navigation Control

Waterway Opening (sf.) 51Structure 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: 2

Main Span Length 8.4 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 5 - Prestress or Precast Median Width On Bridge

ft. Bridge Railing N - NOT REQUIRED

0 - SUBSTANDARD

Main Span Design 15 - Pipe Arch

ft. GR Transition

Skew 30 RIGHT

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 2/1/1991sq. 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 NN ARail Type Lt NN 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.)

E - CULVERT YearPrimer 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 22.0

33.0Deck Rebars Install Year

Deck Rebars

Finish TypeWear Course/Fill Depth 5.00 ft.

N - Not Applicable (applies only to structures with no dec Design Load 5 - HS 20

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

45 ° 45

Inspector Name Owens, Garrett

Latitude Control Section (TH Only) Status' 37.89 ''

2 - 2-way traffic

Routine Inspection Frequency 48

Sect., Twp., Range

0.2 MI N OF JCT TH 23 Level of Service 1 - MAINLINE

- 26W Roadway Type30 - 038N

Detour Length 1.0 mi.R A T I N G S +

Custodian 02 - County Highway Agency

Owner 02 - County Highway AgencyDeck N Unsound

Deck %

C O N D I T I O N° 38 '

A - Open

Longitude 93 000+00.272 + N B I 6.28 '' Reference Point

Crew

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

Agency Br. No. 88

District 03

Bridge Match ID (TIS) 0 Userkey

TWP 129 over CO DITCH # 11, BR #1

Minnesota Structure Inventory Report

Bridge ID: L6492

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

Date: 02/03/2017

Sufficiency Rating 98.0Roadway Name or Description

129

City

Routine Inspection Date 10/21/2014

Desc. Loc.

Township 48002 - BORGHOLM TWNS 129

Number

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

NRoute Sys 08 - TWNSCounty 048 - Mille Lacs Functionally Obsolete

Lanes

Waterway Adequacy 7Max. Vert. Clear.

ft.Legislative District 16Aft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 32.00 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 0.0

32.0 ft.

Service Under

ft.

ft. Approach Alignment 8Horizontal Clear.

ft.

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

HCADT ADTTN

Year Built 1985

MN Year Reconstructed Functional Class

%Channel 7

Substructure

0Superstructure N

ON 2 UNDER

250 YEAR 1985BMU Agreement ADT

Structure Evaluation 7If Divided

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

Deck Geometry NNB-EB SB-WBDate Opened to Traffic

+ R D W Y

FHWA Year Reconstructed

MN Temporary Status

09 - Rural - LocalCulvert 7

A P P R A I S A L R A T I N G S ++ N B I

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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:

Mille Lacs

48002 - BORGHOLM

038N30 26W

1 - Concrete 19 - Culvert (includesframe culverts)

N N N 7 7

8 7

0 - Not Required

0 - Not Required

0 - Not Required

N - Not Applicable

E - CULVERT

0.2 MI N OF JCT TH 23

08 - TWNS 129 000+00.272

20.4

0.0

sq. ft. / %

sq. ft. / %

88"X54"

A - Open

ft.

ft.

Postings:List:

MINNESOTA BRIDGE INSPECTION REPORT

02/06/2017

BRIDGE L6492 TWP 129 OVER CO DITCH # 11, BR #1

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 98.0

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Reinforced Concrete Culvert 10/26/2016 180 LF 0 180 0 0241 Underwater

180 LF 0 180 0 0Migrated Values

Notes: 1-7-93 High ice conditions again this year so couldn't inspect effectively.12-02-97 There is not much room to examine the inside of the pipes, approx. 18"1-19-2000 It has been a dry year and there is only 6 inches from the inside top of pipe to the frozen water line.9/23/2010 Pipe are once again running full. Have contacted Mn/DOT and will place on the list for underwater inspection in 2012. Will rate downuntil underwater inspection is complete.100/21/14 Underwater inspection completed in 2012, no notable findings. Pipes consistantly run full, will recommend underwater inspection oneach cycle

Critical Deficiencies or Safety Hazards 10/26/2016 1 EA 1 0 0 0800 Underwater

1 EA 1 0 0 0Migrated Values

Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION.

Culvert End Treatment 10/26/2016 4 EA 0 4 0 0870 Underwater


Notes: 9/23/2010 Could only see the top 6" of pipe. Will rate down until underwater inspection is complete.

Roadway Over Culvert 10/26/2016 1 EA 1 0 0 0871 Underwater


Notes: 9/23/2010 Added this element with this inspection. Asphalt roadway over culverts shows no sign of settlement or uplift.10/21/14 no new developments

Scour 10/26/2016 1 EA 1 0 0 0885 Underwater

Notes: [2016] Underwater inspection - Element added per underwater inspection requirements.

Other Bridge Signing 10/26/2016 1 EA 0 0 1 0891 Underwater


Notes: 10/21/14 Added this element with this inspection. Culvert markers are absent, making it difficult to locate pipe ends

Slopes & Slope Protection 10/26/2016 1 EA 1 0 0 0892 Underwater


Notes: 9/23/2010 No able to view again this year, consistantly under water.10/21/14 Underwater consistantly, however there is very little if any water movement.

Deck & Approach Drainage 10/26/2016 1 EA 1 0 0 0894 Underwater


Notes: Use this element to rate the condition, function, and adequacy of the drainage system.

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Protected Species 10/26/2016 1 EA 1 0 0 0900 Underwater


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

General Notes:

Inspector's Signature Reviewer's Signature

9/23/2010 See element notes and former inspection reports for notes previously found here.

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:

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4

BRIDGE L6492 TWP 129 OVER CO DITCH # 11, BR #1

REPORT TYPE

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Photo 1 - West Elevation (Culvert Opening Submerged), Looking Northeast

Photo 2 - East Elevation (Culvert Opening Submerged), Looking West

Pictures

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Pictures

Photo 3 - View Looking West

Photo 4 - View Looking East

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Pictures

Photo 5 - Roadway Over Culvert, Looking South

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bridge # l6492 twp 129 over co ditch # 11, br #1

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