US Bridges

West Valley HWY over Green River

Fair

King County, Washington · 0.3 MI S of JCT SR-516 · Structure no. 0008387A0000000

Built
1968
57 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
275 ft
1 main span
Daily traffic
20,000
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

West Valley HWY over Green River is a prestressed concrete stringer/multi-beam or girder carrying West Valley HWY over Green River in King County, Washington. It was built in 1968, so it is 57 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 5 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 20,000 vehicles a day, roughly 3% of them trucks, projected to reach 35,000 by 2040. The structure is 275 ft (83.8 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesWest Valley HWY
CrossesGreen River
Location0.3 MI S of JCT SR-516
RouteCity Street 18100
CountyKing County
StateWashington
Coordinates47.37567, -122.24731
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length275 ft (83.8 m)
Longest span150 ft (45.7 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2024)
Projected traffic35,000 by 2040
Trucks3%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$10.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was West Valley HWY over Green River built?

It was built in 1968, making it 57 years old in 2025.

What condition is West Valley HWY over Green River 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 April 2024.

How much traffic does West Valley HWY over Green River carry?

About 20,000 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is West Valley HWY over Green River?

The structure is 275 ft (83.8 m) long with a longest span of 150 ft (45.7 m) and a deck 40 ft wide.

Who owns West Valley HWY over Green River?

It is owned by the City or Municipal Highway Agency.