US Bridges

SR 131 over Siler Creek

Good

Lewis County, Washington · 0.4 N JCT Natl Forest Bd · Structure no. 082661000000000

Built
1965
60 years old
Condition
Good
inspected April 2024
Type
Slab
Concrete Continuous
Length
60 ft
3 main spans
Daily traffic
308
2023 count
Owner
State
State Highway Agency

About this bridge

SR 131 over Siler Creek is a concrete continuous slab carrying SR 131 over Siler Creek in Lewis County, Washington. It was built in 1965, so it is 60 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 308 vehicles a day, roughly 15% of them trucks, projected to reach 409 by 2039. The structure is 60 ft (18.3 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSR 131
CrossesSiler Creek
Location0.4 N JCT Natl Forest Bd
RouteState Highway 131
Coordinates46.51181, -121.95406
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length60 ft (18.3 m)
Longest span22 ft (6.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic308 (2023)
Projected traffic409 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$884,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 131 over Siler Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is SR 131 over Siler Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does SR 131 over Siler Creek carry?

About 308 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is SR 131 over Siler Creek?

The structure is 60 ft (18.3 m) long with a longest span of 22 ft (6.7 m) and a deck 26 ft wide.

Who owns SR 131 over Siler Creek?

It is owned by the State Highway Agency.