Shoup_bridge_backgroundand_inspectionApril2013.pdf

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Project Proposal

The project will replace the William’s Creek (Shoup) Bridge with a two lane bridge rated for highway loading and includes realignment of approximately 825 feet of roadway. A temporary bridge will be provided or the existing bridge will remain in place during construction.

The approach to the bridge from each direction will be realigned to better match the alignment of the William’s Creek Road west of the project limits. Modification to an existing irrigation ditch and culvert west of the bridge will be part of the roadway realignment and bridge replacement.

The project is needed to address safety hazards mainly due to impediment to the flow of traffic on the busy County road as well as that of State Highway 93and to improve load capacity restrictions, railing deficiencies and reduce operation and maintenance costs.

Background

The existing bridge is single lane structure built in 1952. The road currently transitions from a 22 foot wide paved surface to the 13.5 foot wide bridge. The bridge is a 3 span, 230 foot steel girder and concrete deck structure and has 2 concrete abutments and 2 in river piers. It is a two girder steel structure and classified as fracture critical, which means if one girder fails, the whole bridge would fail. It requires fracture critical inspections using a specialized Reach-All truck on a 24 month interval. National Bridge Inventory (NBI) Item 113 – Scour Critical Bridges is coded as unknown foundation because the bridge has not been evaluated for scour. Because of this the bridge is flagged for monitoring during flood events and if appropriate, closure. Underwater inspection of the in-river piers is required on a 60 month interval. Scour concerns are identified in past bridge inspections and a costly scour assessment is needed.

The bridge was retrofitted in 1994 to increase the load capacity for mining operations. It included installing dewy dag rods near the bottom flange and core drilling the deck for attaching shear studs to the steel girders. The concrete deck was patched and grouted and the deck was epoxy injected to glue severely cracked areas together.

The concrete deck continues to deteriorate and new cracks continue to form. The performance and reliability of the retrofitted bridge system is unknown due to the condition of the deck and connection to shear studs introduces an element of uncertainty and risk to the load rating analysis. The lead base paint on the steel girders continues to deteriorate exposing the steel girders to corrosion and pitting. Significant maintenance costs are anticipated in the next decade as the concrete deck and the steel girders deteriorate. Maintaining the paint on the steel girders and repairing the concrete deck requires specialized containment and hazardous waste disposal.

Sufficiency Rating

Sufficiency ratings are used by the Federal Highway Administration to select candidate bridges for the Highway Bridge Program. Sufficiency ratings are determined during the biennial bridge inspection and are intended to indicate a measure of the ability of a bridge to remain in service.

Calculations for Sufficiency Ratings utilize a formula that includes various factors determined during the bridge field inspection and evaluation. Ratings are on a scale of 1 to 100, with 100 considered as an entirely sufficient bridge, usually new; an entirely deficient bridge would receive a rating of 0.

New Sufficiency Rating Determined

In January of 2013 it came to our attention that the State of Idaho Transportation Department’s (ITD) records for the Shoup Bridge (IDT Bridge key 327456) had inaccurate data affecting the calculated sufficiency rating.

The inaccurate data includes the detour length, the average daily traffic (ADT), and approach roadway width. This recorded information for the Shoup Bridge resulted in a calculated sufficiency rating of 76.8.

The recorded 13 mile detour length was corrected to a 100 mile measured detour length.

The recorded approach roadway width of 14 feet was corrected to the actual measured 22 foot width. This correction classified the bridge as single lane with two way traffic.

The recorded 450 ADT was changed to reflect actual traffic counts performed by Lemi County in 2011. This traffic study determined the ADT to be 843 vehicles per day on the Williams Creek Road. The higher ADT and reclassification to a single lane bridge with 2-way traffic resulted in a NBI deck appraisal rating of 2 meaning the condition is basically intolerable requiring a high priority of replacement.

The new correct data for the Shoup Bridge results in a calculated sufficiency rating of 58.

Pontis Field Inspection Report

State 5

Idaho Transportation Department

% State 1Element Description State 2 State 3 State 4UnitsTotal QtyEnv.Element

Structure Name:

Feature Intersected: 5.4 S. SALMONLocation:

Admin Jurisdiction: Lemhi County

Bridge Key: 32745

District: 06

SALMON RIVER;SHOUP BR

X996300 27.52

7 1/2-inch thick cast-in-place deck with asphalt wearing surface. Previous reports indicate deck has transverse and pattern cracking, and spalling to 3/4 inch deep. 30 foot by 2 inch by 1 inch deep gouge in asphalt in span 1.

1003Concrete Deck - Unprotected w/ AC Overlay 0 0 03875 013 (SF)

(2) 3-span continuous, wide flange steel girders at 10 feet center to center with bolted moment splices; there is (1) loose bolt at the east splice of the downstream girder (girder 1). Welded built-up steel diaphragms; connection angles for diaphragms are intermittent-welded to the girder webs full height.

Girders have been retrofitted with post tensioning Dywidag rods in tension zones. At the west span (span 1) downstream girder, the post tensioning connection bracket has moved 1/16 inch; no change since 2009. There are (2) loose bolts at the post tensioning connection bracket at the west span (span 1) upstream girder, (3) loose bolts at the post tensioning connection bracket at the east span (span 3) upstream girder, and (1) loose bolt at the east span (span 3) upstream girder.

Several small areas of light to moderate corrosion: upstream girder, west span by pier (girder 2, span 1); downstream girder, center span by west diaphragm (girder 1, span 2); and upstream girder, east span (girder 2, span 3). Some moderate corrosion is visible at edges of top flanges that are enclosed in the deck, especially at upstream girder in the west span (girder 2, span 1).

Scattered areas of very light freckled rust throughout, and light rust at the ends of the girders. Pack rust between the top flanges of the steel end diaphragms and the concrete fillets above.

102Painted Steel Open Girder/Beam 2 0 0423 88107 (LF)

Moderate to severe scaling/abrasion at the water line with a small section of exposed reinforcing at the nose of the east pier (pier 2).

974Reinforced Conc Pier Wall 3 0 033 0210 (LF)

Abutments consist of cast-in-place concrete caps on (2) cast-in-place columns each, cast-in-place backwalls, and wingwalls continuous with the backwalls. The steel girders align with the columns.

Edge spalling full length of the east abutment cap due to disintegrating concrete, and three 8-inch x 12-inch delaminations (abutment 2).

Minor hairline cracking at backwalls and wingwalls; disintegrating concrete at tops of the SE and SW wingwalls with a small rebar exposure at the SW wingwall.

603Reinforced Conc Abutment 8 0 048 32215 (LF)

See underwater report.

04Reinforced Conc Submerged Pile Cap/Footing 0 0 01 100220 (EA)

Compression seal missing from joint at west end (abutment 1). Minor leakage at east end (abutment 2).

103Compression Joint Seal 50 0 072 40302 (LF)

4 steel sliders at the abutments with minor surface corrosion. Dirt and debris has built up at the west abutment.

1003Moveable Bearing (roller, sliding, etc.) 0 0 04 0311 (EA)

State 5

Idaho Transportation Department

% State 1Element Description State 2 State 3 State 4UnitsTotal QtyEnv.Element

Structure Name:

Feature Intersected: 5.4 S. SALMONLocation:

Admin Jurisdiction: Lemhi County

Bridge Key: 32745

District: 06

SALMON RIVER;SHOUP BR

X996300 27.52

Domed bearing plates (pinned-type connections) at piers in good condition.

02Fixed Bearing 0 0 04 100313 (EA)

Painted steel W beam on W6x15 painted steel posts at 6 feet-3 inch centers. The posts are cast into the concrete curbs. There is minor collision damage in several locations. The paint has failed with many areas of freckle rust throughout on posts and rail.

503Metal Bridge Railing - Coated 0 0 0453 50330 (LF)

Moderate hairline longitudinal and transverse cracking throughout, some with efflorescence. Some of the cracking at the deck overhangs has possible light rust stain. Oldest cracking has been repaired with injected epoxy, repairs appear to be functioning well.

1003Soffit of Concrete Deck or Slab 0 0 01 0359 (EA)

Local scour at pier 1.

04Scour 0 0 01 100361 (EA)

Structure Name:

Feature Intersected: 5.4 S. SALMON

Location:

Admin Jurisdiction:

District:

Lemhi County

Bridge Key: 32745

SALMON RIVER;SHOUP BR

X996300 27.52

Idaho Transportation Department

Additional Condition Information

ROADWAY APPROACHES: Asphalt with minor settlement, minor rutting, and small potholes at east approach. Poor horizontal alignment to west.

CURBS: Concrete 2 feet 6 inches wide x 9 inches high. Top corners of curbs at outside edges (75 percent plus) have severe spalling and exposed rusty rebar; concrete is disintegrating. Smaller rebar exposures at inside faces.

DRAINS: Drains angle through deck at overhangs; drains have extensions, and all are open.

EMBANKMENT: Stable.

CHANNEL: Natural river channel in earth, cobbles, and boulders; vegetated banks. Local scour by pier 1. Channel is clear.

SIGNS: (4) bridge markers in satisfactory condition, (2) have minor damage. "One Lane Bridge" signs in good condition.

GUARDRAIL: Precast concrete parapets barriers at all (4) corners. (1) bolt and nuts missing at connection to bridge rail at NE corner. Small impact spalls at inside top edges at NE, NW, and SE corners.

UTILITIES: 2-inch steel conduit on outside of north curb.

BIE: Per Lemhi County Road & Bridge, bridge is owned by Forest Service but county has maintenance responsibility.

Reachall inspection performed 4/4/2011. Inspectors: R. Morrow and D Thibault. Reachall Crew: Jim Stocker and Ronnie George.

WORK ACCOMPLISHED: Routine maintenance.

MAINTENANCE RECOMMENDATIONS

Element Action Priority Suggested

Work Assignment Maintenance

Item

Compressn Joint Seal Min Repair Medium Local Agency32745-01

Rehab expansion joints with new seal material.

Bridge Other Low Local Agency32745-02

Remove loose concrete and clean and epoxy paint exposed reinforcing at curbs.

Metal Rail Coated Rehab Elem Low Local Agency32745-03

Replace missing bolts at guardrail to bridge rail connection at NE corner.

Structure Name:

Feature Intersected: 5.4 S. SALMON

Location:

Admin Jurisdiction:

District:

Lemhi County

Bridge Key: 32745

SALMON RIVER;SHOUP BR

X996300 27.52

Idaho Transportation Department

MAINTENANCE RECOMMENDATIONS

Element Action Priority Suggested

Work Assignment Maintenance

Item

R/Conc Abutment Min Repair Low Local Agency32745-04

Remove loose concrete (including at delaminations) and clean and epoxy paint exposed reinforcing at east abutment and wingwall.

04/04/11

Inspector Number:

Inspector's Signature:________________________________________________________

030 - EHM Engineers

Idaho Transportation Department: Division of Highways Structure Inventory and Appraisal Update

Bridge Key: 32745 Structure Name: X996300 27.52

(6)Feature Intersected: SALMON RIVER;SHOUP BR (9)Location: 5.4 S. SALMON

Admin Jurisdiction: Lemhi County5900 -

IDENTIFICATION

(5)Inventory Route:

(4)Place Code:

STRUCTURE TYPE AND MATERIALS

GEOMETRIC DATA

Not within City/Town

CLASSIFICATION

Deficiency:

58.0Sufficiency Rating:

(1)State:

(2)District:

(3)County Code:

16 Idaho

District 6

Lemhi059 (112)NBIS Bridge Length: Yes

0 Not on NHS(104)Highway System:

(26)Functional Class: 08 Rural min Collector

0 Not a STRAHNET hwy(100)Defense Highway:

(101)Parallel Structure: No || bridge exists

(102)Direction of Traffic: 3 1-lane Br for 2-way

(103)Temporary Structure:

(20)Toll Facility: 3 On free road

(21)Custodian: County Hwy Agency

(22)Owner: County Hwy Agency

(37)Historical Significance: 3 Possibly eligible for

0 N/A (NBI)

0 Not part of natl netwo

(105)Federal Lands Highway:

(110)Designated Natl Network:

140000000

(48)Maximum Span Length:

(108c)Deck Protection:

(7)Facility Carried: WILLIAMS CREEK RD

(11)Milepoint:

(12)Base Hwy Network:

(13a)LRS Inventory Route:

(13b)LRS Sub Route:

(16)Latitude:

(17)Longitude:

45d 05' 54"

113d 53' 41"

(98)Border Bridge Code/Pct:

(99)Border Bridge Number:

Not on Base Network

001343Macs Segment on Route:

Macs Segment Under Rte:

Macs Segment Other Rte:

Drawing Number:

Project Key Number:

Inspection Area:

16169

(43a/b)Main Span Material/Design:

Steel Continuous

(44a/b)Approach Span Material/Design:

Stringer/Girder

(45)Number of Spans Main Unit:

(46)Number of Approach Spans:

(107)Deck Type: 1 Concrete-Cast-in-Place

(108a)Wearing Surface: 6 Bituminous

(108b)Membrane: 0 None

None

00000

80 ft

(49)Structure Length: 212 ft

(50a)Curb/Sidewalk Width Lt: 1.3 ft

(50b)Curb/Sidewalk Width Rt: 1.3 ft

(51)Width Curb to Curb: 13.2 ft

(52)Width Out to Out: 18.4 ft

(32)Approach Roadway Width: 14 ft

(33)Median: 0 No median

(34)Skew: 0 °

(35)Structure Flared: 0 No flare

(53)Min Vert Clr Over Deck: 99.99 ft

(54a)Min Vert Undrclear Ref: N Feature not hwy or RR

(54b)Min Vert Undrclear: 00.0 ft

(55a)Min Lat Undrclear Ref Rt: N Feature not hwy or RR

(55b)Min Lat Undrclear Rt: 00.0 ft

(56)Min Lat Undrclearance Lt: 00.0 ft

(10)Vertical Clearance:

(47)Total Horiz Clearance:

Functionally Obsolete

99.99 ft

13.1 ft

168.660

Bridge Key: 32745 Structure Name: X996300 27.52

(6)Feature Intersected: SALMON RIVER;SHOUP BR (9)Location: 5.4 S. SALMON

Admin Jurisdiction: Lemhi County5900 -

CONDITION

NAVIGATION DATA

PROPOSED IMPROVEMENTS

(75a)Type of Work:

(76)Length of Improvment:

(115)Year of Future ADT:

230 ft

LOAD RATING

(31)Design Load:

(41)Posting status:

5 MS 18 (HS 20)

A Open, no restriction

AGE AND SERVICE

INSPECTION

(64)Operating Rating:

(66)Inventory Rating:

(70)Posting:

HS23.7

HS16.5

5 At/Above Legal Loads

43 tons

30 tons

(58)Deck:

(59)Superstructure:

(60)Substructure:

(61)Channel/Channel Protection:

(62)Culvert:

6 Satisfactory

6 Satisfactory

6 Satisfactory

6 Bank Slumping

N N/A (NBI)

(27)Year Built:

(106)Year Reconstructed:

(42a)Type of Service On:

(42b)Type of Service Under:

(28a)Lanes On:

(29)ADT:

(30)Year of ADT:

(109)Truck ADT:

(19)Detour Length:

1 Highway

5 Waterway

(28b)Lanes Under:

13 %

124 miles

APPRAISAL

(a)Bridge Rail:

(b)Transition:

(c)Approach Rail:

(d)Approach Rail Ends:

(67)Structure Condition:

(68)Deck Geometry:

(69)Undrclear, Vert and Horiz:

(71)Waterway Adequacy:

(72)Approach Alignment:

(113)Scour Critical:

6 Equal Min Criteria

2 Intolerable - Replace

N Not applicable (NBI)

8 Equal Desirable

6 Equal Min Criteria

0 Substandard

0 Substandard

0 Substandard

0 Substandard

(36)Traffic Safety Features:

1 Contract

$ 129,000

(75b)Work Done By:

YEAR PROGRAMMED:

(94)Bridge Improvement Cost:

(95)Rdwy Improvement Cost:

(96)Total Project Cost:

(97)Year of Cost Estimate:

(114)Future ADT:

$ 1,290,000

$ 1,935,000

31 Repl-Load Capacity

(38)Navigation Control:

(39)Vertical Clearance:

(40)Horizontal Clearance:

(111)Pier Protection:

(116)Lift Bridge Vert Clr:

Equipment Needed for Regular Inspection?

(90)Inspection Date: 4/4/2011 (91)Inspection Frequency: 24 months

a) Fracture Critical Detail:

b)Underwater Inspection:

c) Fatigue Detail (OS) Inspection:

24 months

60 months

NA

(92)Supplemental Inspections Frequency: (93)Date of Inspections:

None

4/4/2011

a) FC Inspection Date:

c) Fatigue Detail (OS) Date:

d) ReachAll Inspection:

e) Confined Space Inspection:

24 months

NA

d) ReachAll Date:

e) Confined Space Date:

4/4/2011

b) UW Inspection Date: 09/15/2009

Permit Not Required

U Unknown Scour

Bridge Key: 32745 Structure Name: X996300 27.52

(6)Feature Intersected: SALMON RIVER;SHOUP BR (9)Location: 5.4 S. SALMON

Admin Jurisdiction: Lemhi County5900 -

Single Lane Trucks/Buses: No No

POSTING INFORMATION

WEIGHT

HEIGHT

WIDTH

Recommended Actual

Single Lane All Vehicles: Yes Yes

Height Posting:

Recommended Actual

Max Axle

Type3-3 (6 axle) 34 58 Type3-3 (6 axle)

Type3S2 (5 axle) 34 58 Type3S2 (5 axle)

Type3 (3 axle) 23 38 Type3 (3 axle)

HS Truck 30 43

H Truck 17 24

IR (tons) OR (tons) Posting (tons) Posting (tons)

Load Rating Analysis Recommended Actual

Load Analysis Required: (N) No

Load Analysis Date: 01/20/93

WEARING SURFACE and DEAD LOAD INFORMATION inches inchesAsphalt: Concrete:

Granular: inches inchesTimber:

1.0

0.0

0.0

0.0

Bridge Field Inspection Report Photos Idaho Transportation Department

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

West Approach

South Side

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

Width Posting at West Approach and Roadway Alignment with Approach

Width Posting at East Approach

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

Efflorescence and Possible Light Rust Stain on Soffit at Edge

Typical Small Area of Corrosion of Girder Top Flange

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

1/16-inch Movement of Post Tension Rod Connection Block

Loose Bolts in Post Tension Rod Connection Block

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

Pack Rust at End Diaphragm

Typical Scaling/Abrasion at Pier Nose

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

Close-up of Pier Nose

Exposed Reinforcing at Pier 2

District No. 06

Bridge Key: 32745 Structure Name: X996300 27.52 Features: SALMON RIVER;SHOUP BR

Administrative Jurisdiction: Lemhi County Date: 04/04/11

Exposed Reinforcing at Inside Face of Curbs

Concrete Disintegration Exposing Reinforcing at Exterior Sides of Curbs