US Bridges

I-5 over Salzer Creek

Fair

Lewis County, Washington · 2.2 N JCT SR 6 · Structure no. 0003936A0000000

Built
1951
74 years old, rebuilt 1972
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
140 ft
7 main spans
Daily traffic
38,131
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Salzer Creek is a concrete continuous slab carrying I-5 over Salzer Creek in Lewis County, Washington. It was built in 1951 and reconstructed in 1972, so it is 74 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 38,131 vehicles a day, roughly 21% of them trucks, projected to reach 48,938 by 2039. The structure is 140 ft (42.7 m) long and 86 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesI-5
CrossesSalzer Creek
Location2.2 N JCT SR 6
RouteInterstate 5
Coordinates46.691, -122.96992
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length140 ft (42.7 m)
Longest span22 ft (6.7 m)
Deck width86 ft (26.3 m)
Roadway width81 ft (24.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,131 (2023)
Projected traffic48,938 by 2039
Trucks21%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$5.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-5 over Salzer Creek built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1972.

What condition is I-5 over Salzer 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 September 2024.

How much traffic does I-5 over Salzer Creek carry?

About 38,131 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I-5 over Salzer Creek?

The structure is 140 ft (42.7 m) long with a longest span of 22 ft (6.7 m) and a deck 86 ft wide.

Who owns I-5 over Salzer Creek?

It is owned by the State Highway Agency.