US Bridges

US 12 over Coal Creek

Poor

Lewis County, Washington · 20.2 E JCT SR 131 · Structure no. 0001287A0000000

Built
1930
95 years old, rebuilt 1970
Condition
Poor
inspected March 2024
Type
Tee Beam
Concrete
Length
67 ft
3 main spans
Daily traffic
2,494
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Coal Creek is a concrete tee beam carrying US 12 over Coal Creek in Lewis County, Washington. It was built in 1930 and reconstructed in 1970, so it is 95 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,494 vehicles a day, roughly 14% of them trucks, projected to reach 2,941 by 2039. The structure is 67 ft (20.4 m) long and 43 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

CarriesUS 12
CrossesCoal Creek
Location20.2 E JCT SR 131
RouteU.S. Route 12
Coordinates46.64881, -121.61358
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length67 ft (20.4 m)
Longest span34 ft (10.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,494 (2023)
Projected traffic2,941 by 2039
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Coal Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1970.

What condition is US 12 over Coal Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does US 12 over Coal Creek carry?

About 2,494 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 12 over Coal Creek?

The structure is 67 ft (20.4 m) long with a longest span of 34 ft (10.4 m) and a deck 43 ft wide.

Who owns US 12 over Coal Creek?

It is owned by the State Highway Agency.