21b_Bridge_Inspection_Report.pdf

Bridge Number:

Region 1

RIDGEFIELD NATIONAL WILDLIFE REFUGE

LAKE RIVER

Type of Inspection:

BRIDGE INSPECTION AND APPRAISAL REPORT

Date of Inspection:

13551-00007

Routine

Date of Report:

07/27/2016

08/26/2016

Prepared by: Short Elliott Hendrickson, Inc.

U.S. Fish & Wildlife ServiceSubmitted by:

U.S. Fish & Wildlife Service

GEOCAL, Inc.

Division of Engineering

Dam, Bridge & Seismic Safety Branch

Arlington, VA

MAPS 2

BRIDGE IDENTIFICATION, USE, SUMMARY OF FINDINGS 3

RECOMMENDED WORK AND ESTIMATED COSTS 4

SIGN RECOMMENDATIONS AND LOAD RATINGS 8

ADDITIONAL INFORMATION AND COMMENTS 9

CONDITION RATINGS 10

SKETCHES 18

PHOTOGRAPHS 22

TYPICAL SIGNS 43

RATING VEHICLES 44

URGENT ITEM FORM 45

PAGESECTION

TABLE OF CONTENTS

13551-00007 08/26/20162

Station: RIDGEFIELD NWR

Bridge Name: LAKE RIVER

Bridge Location: 0.8 MI S OF OFFICE

Road on Bridge: RIVER "S" UNIT RD

Feature Crossed: LAKE RIVER

Region: 1

State: Washington

Bridge Identification and Location

County: 011 - Clark

Bridge Number: 13551-00007

Bridge Features

Main Structure Type: 302 - Steel

Deck Type:

Deck Surface:

Year Built:

Year Rebuilt:

Type Construction/Materials:

Width (Curb-Curb):

8 - Timber

7 - Timber

Timber deck, timber and steel stringers on timber pile bents and abutments.

014.0

Width (Out-Out):

No. of Main Spans:

Max Span Length:

Total Length:

0016.0

000056

0000332

Bridge Use

In-Use (Y/N): Y

Public Use (Y/N):

Type Use:

Average Daily Traffic (ADT):

Y

The bridge is on a dead-end road providing FWS and public access in the central portion of the refuge. The one-lane bridge carries two-way traffic.

000100

Summary of Findings

The summary condition of the bridge is FAIR.

Two exterior timber piles at the east abutment and one timber pile at the southeast wingwall are heavily rotted. Many deck planks are heavily rotted. One is broken on the north side in the western 1/3. Object markers are not in place.

Sections of the bridge railing are incorrectly lapped on the south rail and there is a gap between rail sections at ends of the 7th span from the east. Vegetation is encroaching into the roadway near the ends of the bridge. The shoulders at the west end of the bridge are sloughing due to lack of adequate retention by the wingwalls. There is a minor amount of sand and gravel on the deck at the ends of the bridge that causes abrasion and wear of the timber planks. There are split and loose runner planks and one is broken on the north side in the western 1/3. Pile bracing members are split, broken and missing in several places. There is submerged debris in the channel on both sides of the bridge that may become caught at the bridge.

Lead Inspector:

Inspector Organization:

Paul J. Jordan, P.E.

Short Elliott Hendrickson, Inc.

Date of Inspection:

Date of Report:

07/27/2016

08/26/2016

Asset Number: 10003577

Ft.

Ft.

Ft.

Ft.

Year of ADT: 16

Bridge Identification, Use, Summary of Findings

13551-00007 08/26/20163

Estimated Remaining Life (Years):

(At current load limits without major repairs or rehabilitation.)

........................................................................... 5 - 10

# of Recommendation Items: 8

Recommended Work and Estimated Costs

$728

$660

Replace broken runner plank and deck plank on north side in the western 1/3 of the bridge. Labor and Equipment: 6 Hours at $85/Hour = $510, Materials:

$100, Adjustment for Location: $150

$660

Construction Estimate: $660

$0 a.

b. Construction Contingency: $0

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$660

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$660:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

$54,676

$49,593

Rehabilitate east abutment; supplement or replace 2 exterior piles and 1 pile at southeast wingwall, replace abutment and wingwall backwall planks. Material, Equipment & Labor: $26,000, Adjustment for location:

$4,700.

$49,593

Construction Estimate: $30,700

$0 a.

b. Construction Contingency: $4,600

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $5,500

$40,800

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$40,800:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

Item Recommendation (See Footnote 1) Priority Assessment

Maint/Repair/ Rehab

Replacement

13551-00007 08/26/20164

$8,644

$7,840

Replace heavily rotted deck planks. Remove soil and gravel on deck at ends of bridge to prevent rot and abrasion. Install transverse gravel stop plank at ends.

Material & Labor: $4,750, Adjustment for Location: $850

$7,840

Construction Estimate: $5,600

$0 a.

b. Construction Contingency: $850

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$6,450

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$6,450:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

$863

$783

Install signs in accordance with "Sign Recommendations" in the next section of this report.

Material: $350, Labor: 6 Hours at $40/hour = $240, Adjustment for Location: $120

$783

Construction Estimate: $710

$0 a.

b. Construction Contingency: $0

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$710

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$710:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

Item Recommendation (See Footnote 1) Priority Assessment

Maint/Repair/ Rehab

13551-00007 08/26/20165

$1,977

$1,793

Reassemble sections of the south bridge rail with sections lapped in the direction of traffic. Install plate to cover gap between sections of W beam bridge rail at ends of steel stringer span to prevent snagging by vehicles. Straighten and renail backing blocks on south rail near west end. Material & Labor: $1,250, Adjustment for Location: $225

$1,793

Construction Estimate: $1,475

$0 a.

b. Construction Contingency: $0

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$1,475

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$1,475:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

$1,325

$1,202

Periodically remove vegetation encroaching into roadway at the northwest, southeast and northeast corners of the bridge to maintain visibility. Labor: 24 Hours at $40/hour = $960, Adjustment for Location:

$120

$1,202

Construction Estimate: $1,090

$0 a.

b. Construction Contingency: $0

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$1,090

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$1,090:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

Item Recommendation (See Footnote 1) Priority Assessment

Maint/Repair/ Rehab

13551-00007 08/26/20166

$5,910

$5,360

Remove floating and submerged debris in channel on both sides of bridge to prevent future damage and accumulation. Equipment and Labor: $3,000, Adjustment for Location: $500

$5,360

Construction Estimate: $3,500

$0 a.

b. Construction Contingency: $500

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$4,000

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$4,000:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

$2,364

$2,144

Replace horizontal and diagonal bracing where split, broken, rotted or missing. Material & Labor: $1,200, Adjustment for Location: $200

$2,144

Construction Estimate: $1,400

$0 a.

b. Construction Contingency: $200

f. Subtotal:

c. Planning/Design/ Const. Mgmt.: $0

$1,600

Const. Mgmt.:

d.

$0

(See footnote 2)

(See footnote 3)

Planning/Design: $0

(See footnote 3) e.

G.A.S.:

Project Total for Year of Estimate

$0

$1,600:

g.

h.

Urgent Item

Escalation for Current Year

2016 :

i.

Escalation for Future Year

2018 :

j.

$69,375 $0Totals

Work Recommendation Remarks

1/Recommended work are items noted by the inspection team on the date of inspection. Urgent items are those which pose a current threat to the strength or stability of the bridge, or involve a significant safety concern. Items are listed in their order of importance. Item 1 considered most important. Adjustments for location include geographical region and remoteness of the bridge adjustment. For multi-use structures such as water control structures or dam spillways, repair or reconstruction estimates, if applicable, are for the bridge component only.

4/Priority assessment value is a representation of the relative priority of a recommendation, with a value of 1 representing the highest priority and 7 representing the lowest priority.

3/Items d. and e., when needed, are used for replacements, and work items over $100,000 in construction value, and use a sliding scale based on the construction estimate. If the item is accomplished by MMS, the mark-up should be adjusted accordingly.

2/Item c., when needed, is used for items up to $100,000 in construction value, except replacements, and includes a mark-up of approximately 18% assuming MMS program accomplishment. If the item is accomplished by other than MMS, the mark-up should be adjusted accordingly.

Footnotes:

Item Recommendation (See Footnote 1) Priority Assessment

Maint/Repair/ Rehab

13551-00007 08/26/20167

Project leaders (and others) should be aware that the posting recommendations are for the absolute maximum load

Steel StringerTimber Stringer Deck on Steel

Stringers Deck on Timber

Stringers

TYPE 3-3 (40T)

TYPE 3S2 (36T)

TYPE 3 (25T)

TYPE HS 20-44

AASHTO TRUCK

TYPE

46.8

INV

Sign Recommendations

No load posting required. Sign for one-lane bridge. Object markers are recommended at all corners of the bridge.

Sign Recommendations

Load Ratings (Tons)

Bridge Element

INV = Inventory Rating

Load Rating Remarks

RUNNERS: 8" x 2 1/2" and 12" x 2 1/2" treated timber planks. DECK: 12" x 3 1/2" treated timber planks. Stresses used: Bending = 1,300 psi, Shear = 105 psi. TIMBER STRINGER: 6 1/4" x 15 1/4" treated timber, spacing = 2'-4", spanning 17'-1". Stresses used: Bending = 1,600 psi, Shear = 113 psi. STEEL STRINGER: HZ 600 LA I-pile section, spacing 3'-8", spanning 55'-6". Stresses used: Structural steel yield stress = 30,000 psi (salvaged). WEST ABUTMENT CAP: Previously rated as spanning 14'-6" between piles (2008) was replaced and new piles were installed. Cap no longer requires load restriction.

Ratings are from 1993 report except 'DECK ON TIMBER STRINGERS' which was rated in 1996.

Todd Stueve, 12/02/96RATING PREPARED BY:

INV OPER INV OPER INV INVOPER OPER OPER

24.0

41.6

31.9

65.8

70.8

15.9 21.1

27.5

43.5

26.2 35.8

28.4

47.8

58.8

30.2 45.1

OPER = Operating Rating

Load posting sign recommendations are based on operating ratings. See note regarding posting recommendations below.

RATING VERIFIED BY: Paul Jordan, 8/12/16

One lane bridge signs are in place. Object markers are not in place.

Sign Status

The load rating from 1996 is still considered valid. No significant changes in the condition of the bridge which would affect the rating were observed during the 2016 inspection. The load capacity and weight limit posting recommendations remain as shown above.

Sign Recommendation Remarks

Important Note Regarding Posting Recommendations levels to which a structure may safely be subjected for limited passages of the loads. Should the need arise to subject the bridge to sustained loading at or near this level, the Project Leader should contact the Regional Engineer for guidance regarding an appropriate safe load capacity.

Sign Recommendations and Load Ratings

13551-00007 08/26/20168

Description of Bridge

The bridge was constructed in approximately 1970 and the removable steel main span added in 1980. The bridge consists of one main span of steel stringers and 18 approach spans of treated timber stringers, all with treated timber plank deck and runner planks. The spans are all supported on treated timber pile bents and abutments. Additional work, including piling under the utility boxes and at the 2nd bent from the west, was done in 1991. Also, at some time in the past, intermediate supports were added which are now bents 10 and 12 (abutment 1 is at east).

Comparison to Previous Inspection

Next Inspection

Additional Comments

There are no significant changes is the condition of the bridge since the previous inspection. There is a broken runner plank and deck plank on the north side in the western 1/3 of the bridge.

The next inspection for this bridge is recommended as a routine inspection with a full report in two years.

Underwater inspections of the timber was completed July 27, 2016 and August 7, 2012. Findings are in a separate report, and are summarized in the condition ratings section of this report. There continues to be more deterioration of the piling above the water than below.

An under bridge inspection vehicle was used during the 2016 and 2012 inspections. It is recommended that the UBIV be used every four years.

Additional Information and Comments

13551-00007 08/26/20169

CONDITION RATINGS

9 -

N/A.

Excellent Condition.

8 - Very Good Condition - no problems noted.

7 - Good Condition - some minor problems.

6 - Satisfactory Condition - structural elements show some minor deterioration.

5 - Condition - all primary structural elements but may have minorFair section loss, cracking, spalling, or scour.

4 - Poor Condition - advanced section loss, deterioration, spalling, or scour.

3 - Serious Condition - loss of section, deterioration, spalling, or scour have seriously affected primary structural components. Local failures are possible.

Fatigue cracks in steel or shear cracks in concrete may be present.

2 - Critical Condition - advanced deterioration of primary structural elements.

Fatigue cracks in steel or shear cracks in concrete may be present or scour may have removed substructure support. Unless closely monitored it may be necessary to close the structure until corrective action can be taken.

1 - Imminent Failure Condition - major deterioration or section loss present in critical structural components or obvious vertical or horizontal movement affecting structure stability. Structure is closed to traffic but corrective action may return structure to light service.

0 - Failed Condition - out of service; beyond corrective action.

Note - Items left blank are not applicable for this bridge.

N -

Condition Rating Codes for Items 218, and 58 through 62:

RATING

218.1 Approach Slab

Overall Rating (218) Satisfactory.6

218.2 Relief Joints

218.3 Approach Guardrail

Galvanized W beam rail on treated timber posts, blocked out, at all corners. Southeast end is not tight against backer block.

Northeast end backer block is rotated.

218.4 Surfacing

Gravel - Low 2" at west end of bridge.

218.5 Embankment

Steep (greater than 1:1) - Overgrown with brush, sloughing at corners encroaching into roadway at northwest.

218.6 Signs "One Lane Bridge" sign at both ends. "Open Daylight Hours Only" at east end. "Speed Limit 5 MPH" at each end.

218.7 Vegetation Grass and weeds growing on shoulders and slopes at west, tree branches at northeast - Encroaching into roadway reducing visibility.

ITEM REMARKS

Good

Satisfactory

Satisfactory

Satisfactory

Satisfactory

Approaches (218)

13551-00007 08/26/201610

RATING

58.1 Deck Structure 5 Treated timber planks - Light to moderate checks, minor rot in small areas, heavy rot in approximately 25%. Some portions of planks replaced between 2010 & 2012. North runner plank and deck plank are broken in the 4th span from west.

Overall Rating (58) Fair condition (minor section loss).5

58.2 Expansion Joints

58.3 Wearing Surface

Treated timber runner planks - Minor splits and checks, numerous planks are loose, heavy wear along south edges of south planks, breaking up at several areas, especially at west end of bridge. Several new runners added between 2012 and 2014. Third runner plank from north at west span and third runner plank from north in span 5 from west are severely rotted.

58.4 Rideability

58.5 Curbs Treated timber bolted to deck planks with L-brackets on inside face. Replaced between 2008 and 2010. Deep checks in tops and faces.

58.6 Parapets/railings

Treated timber posts bolted to curbs and brackets bolted to exterior stringers with timber blocks and W beam rail - Added between 2008 and 2010. Three blocks on south rail at west end are rotated. Not continous at ends of 7th span from east.

W beam is aligned on either side of gaps, and bridged on the back side with sign post sections, but there is still a snagging hazard. Sections are lapped in wrong direction on south rail.

58.7 Drains/drainage

58.8 Cleanliness Soil and gravel on ends of deck, especially at east.

58.9 Utilities 3 1/2" diameter aluminum conduit and telephone wire and 2 1/2" diameter PVC conduit on top of north curb.

58.10 Lighting

ITEM REMARKS

Fair

Satisfactory

Satisfactory

Good

Good

Satisfactory

Good

Deck (58)

13551-00007 08/26/201611

59.1 Bearing Devices 5 Small spacer blocks under exterior stringers at bearings on bent caps are split at several random locations.

59.2A Diaphragms

59.2B Bracing

Overall Rating (59) Satisfactory condition (some minor problems).6

59.2 Girders

59.3 Floor Beams

59.4 Stringers 6

59.5 Trusses

Steel stringers: I-pile section, diaphragms at bearings and 1/3 points. Treated timber stringers: Timber blocking at bents and at post locations in 3 exterior bays on both sides.

Exterior stringers newer than interior. Minor checks in several. Minor split at a knot on the south face of the 3rd stringer from the south in the 5th span from the west. 4" wide X 1" deep X 5' long split at midspan in bottom of 2nd stringer from north in west span.

59.6 Paint

59.7 Splices & Conn's

59.8 Rivets or Bolts

59.9 Welds

59.10 Corrosion (rust)

Diaphragms welded to steel stringers.

59.11 Timber Decay

59.12 Deflection Under Load

Diaphragms welded to steel stingers.

59.13 Vibration Under Load

Light surface rust on steel throughout. Flakes and minor pitting at bottom 1" of web on north face of north exterior steel stringer. Minor pitting on bottom of top flanges.

ITEM REMARKS

59.5A Portals

59.5B Bracing

Light rot in areas especially at end spans.

Minor deflection noted under weight of 1/2 Ton pickup truck.

Minor vibration noted under weight of 1/2 Ton pickup truck.6

59.14 Collision Damage

Fair

Satisfactory

Satisfactory

Satisfactory

Satisfactory

Satisfactory

Satisfactory

Satisfactory

Superstructure (59)

13551-00007 08/26/201612

ABUTMENTS

Overall Rating (60) Poor condition (advanced deterioration).4

60.1 Wings

Short extension of backwall cribbing at west, flared at east.

Split log at southeast, full log at northeast, cribbing and treated timber piles tied back with cables at east. Cables are slack and ineffective. One pile failed at southeast wing.

Wood dust on ground at northeast from insects.

60.2 Backwalls/Bulkheads

Treated timber cribbing - Backwall planks replaced between 2008 and 2010.

60.3 Bearing Seats Treated timber stringers bear on treated timber abutment caps - Minor checks. West abutment cap replaced between 2008 and 2010. 1/2" wide gap between cap and north 2 piles of west abutment at front edge.

60.4 Breastwalls/Columns Treated timber cribbing - Backwall planks replaced between 2008 and 2010. Minor checks. Minor sloughing under cribbing at west, undermined back 8".

60.5 Weep Holes

60.6 Footings/Sills

60.7 Piles/Bracing

Old piles at west abutment replaced between 2008 and 2010. North and south piles at east abutment heavily to severely rotted. Center pile has moderate to heavy rot.

Heavy rot in horizontal braces at east abutment, north braced is failed and fallen on the ground.

60.8 Erosion/Scour

60.9 Settlement

ITEM REMARKS

BENTS/PIERS

60.10 Bearing Seats 6 Steel and timber stringers bear on treated timber pile caps.

Treated timber - Minor to moderate checks on bottoms of most, minor rot.

Treated timber, a few supplemental piles driven in 1981.

Piles were sounded near mid-height and at ground.

Moderate to heavy rot and deep checks above water line in older piles. North and center piles not centered under cap at bent on west end of steel span, 33% bearing loss. South pile at Bent 13 from east had top 8' replaced and spliced with steel angles. Supplemental cap and pile support at heavily rotted south pile of Bent 18 from east. Center pile at Bent 18 is offset 1/3 of pile diameter under cap. Middle pile at east Bent is split from top down 10'. Middle pile at west Bent has deep checks. Steel cable is strung through the west portion of the bridge to supplement horizontal bracing, but is slack. Numerous horizontal braces have minor splits, and horizontal brace at 7th bent from west is failed.

Findings of the 8/7/12 underwater inspection indicate little deterioration, and north pile of 11th bent from west has 50% section loss at a pipe collar (previous repair?) from -10' to the mudline.

60.11 Caps

60.12 Columns/Walls

60.13 Piles/Bracing

Poor

Satisfactory

Satisfactory

Satisfactory

Poor

Satisfactory

Satisfactory

Satisfactory

Poor

Substructure (60)

13551-00007 08/26/201613

Substructure (60) west portion of the bridge to supplement horizontal bracing, but is slack. Numerous horizontal braces have minor splits, and horizontal brace at 7th bent from west is failed.

Findings of the 8/7/12 underwater inspection indicate little deterioration, and north pile of 11th bent from west has 50% section loss at a pipe collar (previous repair?) from -10' to the mudline.

60.14 Footings/Sills

60.15 Erosion/Scour

60.16 Settlement 7 Eleventh bent from east has 3" shim under cap. Others have smaller shims.

Good

13551-00007 08/26/201614

61.1 Scour/Erosion 7 Good alignment - 4' high vertical bank and active sloughing along west shoreline. The channel has aggraded approximately 2 feet since 2012.

Overall Rating (61) Bank protection needs minor repairs.7

61.2 Channel Protection

61.3 Spur Dikes, Jetties

61.4 Waterway Obstructions

Branches and large logs on banks and caught at bridge, submerged debris in channel at both sides of bridge.

61.5 Adequacy of Opening

61.6 Normal Velocity

61.7 Average Opening

Sandy, silty.61.8 Stream Bed Material

ITEM REMARKS

Medium

Sufficient

Good

Satisfactory

Good

Good

Satisfactory

Channel (61)

13551-00007 08/26/201615

COVER

Overall Rating (62) Not applicable.N

62.1 Embankment

62.2 Surfacing

62.3 Shoulders

62.4 Headwalls

62.5 Wings

62.6 Barrel

62.7 Footings

62.8 Design Opening

ITEM REMARKS

STRUCTURES

62.9 Opening Remaining

62.10 Debris/Silt

62.11 Erosion/Scour

62.12 Grade %

HYDRAULICS

Culverts (62)

13551-00007 08/26/201616

36.A Bridge Railing

12" high curbs are FWS approved curb-type rails. W beam rail on treated timber posts with timber pedestrian rail on top.

36.B Guard/Bridge Rail Transitions

36.C Approach Railing

Galvanized W beam rail at all corners.

36.D Approach Rail Ends

8113. Scour No signs of scour, good alignment.

ITEM REMARKS

41. Load Posting Status A Not posted. No posting required.

No record available.Accident History

Stable

Open not required.

N Not applicable or a safety feature is

1 Meets current FWS guidelines.

guidelines

0 Does not meet current FWS new rail

Railing Legend

Railing (36), Scour (113), Load Posting System (41), Accident History

13551-00007 08/26/201617

13551-00007 08/26/201618

13551-00007 08/26/201619

13551-00007 08/26/201620

WES

T

ABU

T. 1

BEN

T 2

BEN

T 3

BEN

T 4

BEN

T 5

BEN

T 6

BEN

T 7

BEN

T 8

BEN

T 9

BEN

T 10

BEN

T 11

BEN

T 12

BEN

T 13

MID

POI

NT

BEN

T 14

BEN

T 15

BEN

T 16

BEN

T 17

BEN

T 18

BEN

T 19

EAS

T

ABU

T. 20

Assumed Pile Tip Elevation -50.0 -50.0

Base of Pier Wall

500 Yr. Scour

2016 -4.83-11.5-23.5-37.1-38.7-40.0-40.0-40.0-41.0-42.2-43.8-43.8-42.0-41.9-41.3-40.6-37.7-36.8-34.5-12.0-3.83

2014 -4.83-11.5 -29.5-31.7-40.5 -43.7 -42.5 -44.0-43.1-39.7 -33.2-29.6-12.0-3.83

2012 -4.83-11.5-23.5-29.5-31.7-40.5 -43.7 -42.5 -44.0-43.1-39.7 -33.2-29.6-12.0-3.83

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

RIDGEFIELD NWR LAKE RIVER 13551-00007

13551-00007 08/26/2016

View down centerline of bridge roadway looking east

Elevation looking downstream

Structure Number/Name: 13551-00007/LAKE RIVER

13551-00007 08/26/201622

Elevation looking upstream

Low approach at the west end of bridge

13551-00007 08/26/201623

Gap between east abutment and deck allowing soil to spill through to bearing area

Gravel on deck at east end

13551-00007 08/26/201624

Bolt loose at first approach rail from east

Bridge rail is lapped incorrectly at the south side

13551-00007 08/26/201625

Broken deck and runner planks at eleventh bridge post from west

Rotted runner plank at fourteenth bridge rail post from west

13551-00007 08/26/201626

Rotted and damaged runner planks on south side (similar throughout)

Wood block cover is rotted and split exposing southwest lifting lug in main span

13551-00007 08/26/201627

Deep check in timber curb on north side

Rotted bracing timber at northeast pile connection

13551-00007 08/26/201628

Gap between pile and abutment at northwest corner

Rotted and collapsing wingwall at southeast corner

13551-00007 08/26/201629

Rotted and broken timber pile at southeast wingwall

Embankment fill spilling out under back wall cribbing at west abutment

13551-00007 08/26/201630

Soil on east abutment sill

Split south timber pile at second bent from west

13551-00007 08/26/201631

Split timber pile at first bent from east abutment

Checks in middle pile of third bent from east

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Core rot in end of diagonal brace on the north side of the fourth bent from east

Check in bent cap on fourth bent from east (typical of several)

13551-00007 08/26/201633

Pile splice angle iron is loose on north pile in seventh bent from the east

Rotted south end of lateral brace in seventh bent from east.

13551-00007 08/26/201634

Pitting rust on web and top of bottom flange of main span girder (typical throughout)

Pitting rust on bottom of top flange of main span girder (typical throughout)

13551-00007 08/26/201635

Shims on bent cap a east end of main span

General underside view of main span

13551-00007 08/26/201636

Diaphragm on north side in eighth span from east in not attached to girder (typical of several)

Diaphragm blocks are missing between center girders in eighth span from east

13551-00007 08/26/201637

Crack in bent cap above middle pile in eleventh bent from east

Shims under bent cap in twelfth bent from east

13551-00007 08/26/201638

Bent cap not centered on south pile in thirteenth bent from east

Split horizontal brace at south end of thirteenth bent from east

13551-00007 08/26/201639

View of spliced south pile in fourteenth bent from the east

Check in south exterior stringer in fifteenth span from the east

13551-00007 08/26/201640

Split shim block under south exterior stringer at sixteenth bent from east (typical of numerous)

Broken diagonal brace repaired with supplemental board in fifteenth span from east

13551-00007 08/26/201641

Typical view of underside of bridge

13551-00007 08/26/201642

Typical Signs

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