US Bridges

SR 504 over Outlet Creek

Fair

Cowlitz County, Washington · 10.9 E JCT I-5 · Structure no. 002000800000000

Built
1970
55 years old, rebuilt 1982
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
69 ft
4 main spans
Daily traffic
1,013
2023 count
Owner
State
State Highway Agency

About this bridge

SR 504 over Outlet Creek is a concrete continuous culvert carrying SR 504 over Outlet Creek in Cowlitz County, Washington. It was built in 1970 and reconstructed in 1982, so it is 55 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 1,013 vehicles a day, roughly 16% of them trucks, projected to reach 1,388 by 2039. The structure is 69 ft (21 m) long. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesSR 504
CrossesOutlet Creek
Location10.9 E JCT I-5
RouteState Highway 504
CountyCowlitz County
StateWashington
Coordinates46.32875, -122.72708
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadUnknown
Structure length69 ft (21 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,013 (2023)
Projected traffic1,388 by 2039
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 504 over Outlet Creek built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1982.

What condition is SR 504 over Outlet 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 July 2023.

How much traffic does SR 504 over Outlet Creek carry?

About 1,013 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is SR 504 over Outlet Creek?

The structure is 69 ft (21 m) long with a longest span of 15 ft (4.6 m).

Who owns SR 504 over Outlet Creek?

It is owned by the State Highway Agency.