US Bridges

US 12 over Lake Creek

Fair

Lewis County, Washington · 10.0 E JCT SR 122 · Structure no. 0007952A0000000

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
130 ft
3 main spans
Daily traffic
4,771
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Lake Creek is a concrete continuous slab carrying US 12 over Lake Creek in Lewis County, Washington. It was built in 1966, so it is 59 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 4,771 vehicles a day, roughly 22% of them trucks, projected to reach 5,801 by 2039. The structure is 130 ft (39.6 m) long and 40 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesUS 12
CrossesLake Creek
Location10.0 E JCT SR 122
RouteU.S. Route 12
CountyLewis County
StateWashington
Coordinates46.55411, -122.29294
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span51 ft (15.5 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,771 (2023)
Projected traffic5,801 by 2039
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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$2.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Lake Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is US 12 over Lake Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does US 12 over Lake Creek carry?

About 4,771 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is US 12 over Lake Creek?

The structure is 130 ft (39.6 m) long with a longest span of 51 ft (15.5 m) and a deck 40 ft wide.

Who owns US 12 over Lake Creek?

It is owned by the State Highway Agency.