US Bridges

SW Admiral Way over Ravine Fairmount Ave

Fair

King County, Washington · 4001 SW Admiral Way · Structure no. 085167000000000

Built
1927
98 years old
Condition
Fair
inspected April 2024
Type
Truss - Deck
Concrete Continuous
Length
290 ft
1 main span
Daily traffic
31,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

SW Admiral Way over Ravine Fairmount Ave is a concrete continuous truss - deck carrying SW Admiral Way over Ravine Fairmount Ave in King County, Washington. It was built in 1927, so it is 98 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 31,000 vehicles a day, roughly 5% of them trucks, projected to reach 45,000 by 2040. The structure is 290 ft (88.4 m) long and 32 ft wide.

Location

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CarriesSW Admiral Way
CrossesRavine Fairmount Ave
Location4001 SW Admiral Way
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.5812, -122.38226
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating29 US tons

Structure

Structure typeTruss - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadHS 20
Structure length290 ft (88.4 m)
Longest span80 ft (24.4 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,000 (2020)
Projected traffic45,000 by 2040
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW Admiral Way over Ravine Fairmount Ave built?

It was built in 1927, making it 98 years old in 2025.

What condition is SW Admiral Way over Ravine Fairmount Ave 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 SW Admiral Way over Ravine Fairmount Ave carry?

About 31,000 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SW Admiral Way over Ravine Fairmount Ave?

The structure is 290 ft (88.4 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.

Who owns SW Admiral Way over Ravine Fairmount Ave?

It is owned by the City or Municipal Highway Agency.