bridge # 27a34 81(enchanted lane) over channel81(enchanted lane) over channel minnesota structure...

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:

27A34

81(ENCHANTED LANE) over CHANNEL

Metro Hennepin Shorewood

09/07/2016

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 11

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 inspected at Bridge No. 27A34, Piers 1 and 2, were found to be in good condition with no defects of structural significance observed. The channel bottom material consisted primarily of sand infill and large riprap. The channel bottom appeared stable with no significant scour.

(A) The channel bottom material consisted of cobble with sand infill with up to 2 inch penetration

(B) The timber piles were generally sound and in good condition with negligible deterioration.

(C) Riprap, up to 2 feet diameter, protected both banks in the vicinity of the structure.

INSPECTION FINDINGS

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Top of cap at the north end of Pier 1; assumed elevation of 100.0 feet.Water Level Reference:

WATERLINE DATUM

Waterline Elevation (feet):

Approximately 3.7 feet below reference.Description:

96.3

4.

Piers 1 and 2Substructure(s) Inspected:

SUBSTRUCTURE INSPECTION DATA

General Shape:

6.2Maximum Water Depth at Substructure(s) Inspected (feet):

Piers 1 and 2 each consist of eight timber piles driven to bearing into the channel bottom.

Code:Item 62: Culvert:

8

Y 48 09/2016Code: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:

8Code:

MetroDistrict:

81(ENCHANTED LANE)

County:

The bridge superstructure consists of three spans of multiple timber beams. The superstructure is supported by two timber pile abutments and two timber pile bent piers. The piers are numbered 1 and 2 starting from the west end of the bridge.

Bridge Description:

027 - Hennepin

Facility Carried:

BRIDGE DATA1.


Bridge #:

CHANNELFeature Intersected:

27A34

Underwater Visibility (feet):

Cloudy, 75°FWeather Conditions:

5.0

3.

NegligibleWaterway Velocity (ft/sec):

09/07/2016

Professional Engineer/Team Leader:

INSPECTION DATA2.

Garrett Owens P.E.

Date of Underwater Inspection:

Cory Stuber P.E.Inspection Diver:

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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

228

CS3 CS4

Timber Pilings 1616 EA

CS2ELEM # Unit CS1Element Description Quantity

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The routine underwater inspection of Bridge 27A34 (Enchanted Lane over a channel) was completed on September 7, 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 two timber piers. According to the bridge inventory, Piers 1 and 2 were founded on timber pile bents, timber bearing piles and a timber cap, with diagonal timber cross bracing. 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)

2 - TIMBERCantilever ID

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

4 - PILE BENT

Underwater Y 60Culvert Type 4 - PILE BENT

Pinned Asbly.

09/07/2016

Barrel Length

52.0 ft. Navigation Control

Waterway Opening (sf.) 200Structure Length

ft. Year Painted

0 - No nav. control on waterwayDeck Width (Out-to-Out) 24.0

+ P A I N T +

APPR: 0 TOTAL:5 - Not eligible

MAIN: 3

Main Span Length 20.0 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 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)

2 - TIMBER 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 07/26/20111044 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) 1248 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

0.00 ft. Vertical0.00 ft. Rt

Wear Surf Install Year

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

I - LOW RISK Year 2001Primer 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 26.5

36.6Deck Rebars Install Year

Deck Rebars

Finish TypeWear Course/Fill Depth 0.25 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

44 ° 54

Inspector Name Stuber, Cory

Latitude Control Section (TH Only) Status' 43.18 ''

2 - 2-way traffic

Routine Inspection Frequency 24

Sect., Twp., Range

TO SHADY ISLAND Level of Service 1 - MAINLINE

- 23W Roadway Type30 - 117N

Detour Length 99.0 mi.R A T I N G S +

Custodian 04 - City or Municipal Highway Agency

Owner 04 - City or Municipal Highway Agency

Deck 8 Unsound Deck %

C O N D I T I O N° 38 '

A - Open

Longitude 93 000+00.000 + N B I 10.87 '' Reference Point

Crew

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

Agency Br. No. 194

District 05

Bridge Match ID (TIS) 0 Userkey

81(ENCHANTED LANE)

over CHANNEL

Minnesota Structure Inventory Report

Bridge ID: 27A34

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

Date: 01/17/2017

Sufficiency Rating 73.6Roadway Name or Description

81

City Shorewood

Routine Inspection Date 08/20/2015

Desc. Loc.

Township MUN 81

Number

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

NRoute Sys 10 - MUNCounty 027 - Hennepin Functionally Obsolete

Lanes

Waterway Adequacy 9Max. Vert. Clear.

ft.Legislative District 33Bft.Potential ABC 2 - N/A ft.

ft.On - Off System Roadway Width 20.00 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 20.0

20.0 ft.

Service Under

ft.

ft. Approach Alignment 8Horizontal Clear.

ft.

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

HCADT ADTT8

Year Built 1997

MN Year Reconstructed Functional Class

%Channel 9

Substructure

0Superstructure 8

ON 2 UNDER

260 YEAR 1988BMU Agreement ADT

Structure Evaluation 8If Divided

D I M E N S I O N S +Bridge Plan Location 1 - CENTRAL

Deck Geometry 4NB-EB SB-WBDate Opened to Traffic

+ R D W Y

FHWA Year Reconstructed

MN Temporary Status

19 - Urban - LocalCulvert N

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:

Hennepin

Shorewood

117N30 23W

7 - Wood or Timber 1 - Slab

8 8 8 9 N

8 9

0 - Not Required

0 - Not Required

0 - Not Required

N - Not Applicable

I - LOW RISK

TO SHADY ISLAND

10 - MUN 81 000+00.000

52.0

24.0

1044 sq. ft. / %

sq. ft. / %

N/A

A - Open

ft.

ft.

Postings:List:

MINNESOTA BRIDGE INSPECTION REPORT

01/18/2017

BRIDGE 27A34 81(ENCHANTED LANE) OVER CHANNEL

Unofficial Structurally Deficient N

NUnofficial Functionally Obsolete

Unofficial Sufficiency Rating 73.6

ELEMNBR ELEMENT NAME INSP. DATE QUANTITY

QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4REPORT TYPE

Timber Slab 09/07/2016 1248 SF 1248 0 0 054 Underwater

1248 SF 1248 0 0 0Migrated Values

Notes: [2016] Migrator assumed CS1.

510 - Wearing Surfaces 1044 SF 1044 0 0 0

Notes: [08/20/15] Roadway field measures 20'-3" + (2) 11" rub rails, OTO width = 22'-1". OTO bridge field measures 52'-0". Slab Area = 1148sf.

Underwater 09/07/2016

1044 SF 1044 0 0 0Migrated Values

Timber Floor Beam 09/07/2016 124 LF 124 0 0 0156 Underwater

124 LF 124 0 0 0Migrated Values

Notes: [08/20/15] Element added. 12x6 timber section; (1) stiffener beam in each approach span & (2) stiffener beams in the main span.Same quantity as timber cap, 124 LF, all in Condition State 1

Timber Abutment 09/07/2016 102 LF 102 0 0 0216 Underwater


Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0).[08/20/15] Slight quantity change for field measured dimensions, no condition state change.

Wingwall notes:[08/20/15] No change.

Timber Pile 09/07/2016 36 EA 36 0 0 0228 Underwater

36 EA 36 0 0 0Migrated Values

Notes: [08/20/15] Remove timber column quantity, coded incorrectly. 10 piles at each abutment/ww + 8 piles at each pier, total = 36, all inCondition State 1

Timber Pier Cap 09/07/2016 124 LF 124 0 0 0235 Underwater


Notes: [08/20/15] Slight quantity change for field measured dimensions, no condition state change.

Timber Bridge Railing 09/07/2016 104 LF 104 0 0 0332 Underwater


Notes: [08/20/15] No change.

Critical Deficiencies or Safety Hazards 09/07/2016 1 EA 1 0 0 0800 Underwater


Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION.[08/20/15] No change.

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Bituminous Approach Roadway 09/07/2016 2 EA 2 0 0 0822 Underwater



Scour 09/07/2016 1 EA 1 0 0 0885 Underwater

Other Bridge Signing 09/07/2016 1 EA 1 0 0 0891 Underwater


Notes: [08/20/15] Element added. All object markers accounted for and visible. Vegetation growth at SW corner of abutment growing uparound object marker.

Slopes & Slope Protection 09/07/2016 1 EA 1 0 0 0892 Underwater


Notes: [08/20/15] No change, channel slopes well protected.

Guardrail 09/07/2016 1 EA 1 0 0 0893 Underwater



Deck & Approach Drainage 09/07/2016 1 EA 1 0 0 0894 Underwater


Notes: [08/20/15] No change, deck scuppers open, free of debris.

Miscellaneous Items 09/07/2016 1 EA 1 0 0 0899 Underwater


Notes: [08/20/15] Element added. (3) separate conduits on the south side of the bridge. (1) 3" gas line, marked at east end of bridge; (1) 16"conduit (insulated water main?); & (1) 4" conduit (galvanized?).

Protected Species 09/07/2016 1 EA 1 0 0 0900 Underwater


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

General Notes: [08/20/15] Inspection by WSB.[08/20/15] 40" clearance to bottom of spreader beam in Span 2.[08/20/15] 4' water depth in channel under Span 2.[08/20/15] Removed element 206.[08/20/15] Added element 228.[08/20/15] Added element 415.[08/20/15] Added element 981.[08/20/15] Vegetation growing at SW corner of bridge, nearly obstructing object markers, should be removed.

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:

[08/20/15] Timber slab covered by 3.5" bituminous wear course; no change. Measures 2" at the gutter line, 5" at CL bridge.

[08/20/15] Change to substandard.

[08/20/15] No change.

[08/20/15] No change.

[08/20/15] Change to substandard. Approach guardrail ends are turned down.

[08/20/15] Timber slab covered by 3.5" bituminous wear course; bottom of timber slab stringers in very good condition in allspans, no change.

[08/20/15] No change.

[08/20/15] No change. 40" freeboard to Span 2 spreader beam.

[08/20/15] No change.

[08/20/15] No change.


QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

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QTYCS 1

QTYCS 2

QTYCS 3

QTYCS 4


REPORT TYPE

Inspector's Signature Reviewer's Signature

Cory Stuber

71. Waterway Adeq NBI:

72. Appr RoadwayAlignment NBI:

[08/20/15] No change.

[08/20/15] No change.

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Photo 1 - South Elevation, Looking North.

Photo 2 - North Elevation, Looking Southwest.

Pictures

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Pictures

Photo 3 - Pier 1, Looking East.

Photo 4 - Pier 2, Looking East.

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Pictures

Photo 5 - West Abutment, Looking West.

Photo 6 - East Abutment, Looking East.

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bridge # 27a34 81(enchanted lane) over channel81(enchanted lane) over channel minnesota structure...

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