US Bridges

SW Spokane ST over Delridge Way SW

Fair

King County, Washington · 1200 SW Spokane ST · Structure no. 085300000000000

Built
1983
42 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
1,521 ft
14 main spans
Daily traffic
93,180
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

SW Spokane ST over Delridge Way SW is a prestressed concrete continuous stringer/multi-beam or girder carrying SW Spokane ST over Delridge Way SW in King County, Washington. It was built in 1983, so it is 42 years old, younger 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 93,180 vehicles a day, roughly 10% of them trucks, projected to reach 144,054 by 2040. The structure is 1,521 ft (463.6 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesSW Spokane ST
CrossesDelridge Way SW
Location1200 SW Spokane ST
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.57111, -122.35
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans14 (+1 approach)
Design loadHS 20
Structure length1,521 ft (463.6 m)
Longest span155 ft (47.2 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic93,180 (2024)
Projected traffic144,054 by 2040
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$76.8 million (2041 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW Spokane ST over Delridge Way SW built?

It was built in 1983, making it 42 years old in 2025.

What condition is SW Spokane ST over Delridge Way SW 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 SW Spokane ST over Delridge Way SW carry?

About 93,180 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is SW Spokane ST over Delridge Way SW?

The structure is 1,521 ft (463.6 m) long with a longest span of 155 ft (47.2 m) and a deck 40 ft wide.

Who owns SW Spokane ST over Delridge Way SW?

It is owned by the City or Municipal Highway Agency.