US Bridges

SW Spokane ST over E Marginal Way S

Fair

King County, Washington · 1200 SW Spokane ST · Structure no. 085297000000000

Built
1983
42 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
2,357 ft
24 main spans
Daily traffic
10,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

SW Spokane ST over E Marginal Way S is a prestressed concrete continuous stringer/multi-beam or girder carrying SW Spokane ST over E Marginal Way S 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 10,000 vehicles a day, roughly 5% of them trucks, projected to reach 65,000 by 2042. The structure is 2,357 ft (718.4 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesSW Spokane ST
CrossesE Marginal Way S
Location1200 SW Spokane ST
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.57141, -122.34278
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans24
Design loadHS 20
Structure length2,357 ft (718.4 m)
Longest span158 ft (48.2 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic10,000 (2020)
Projected traffic65,000 by 2042
Trucks5%
Lanes on structure1
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$58.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW Spokane ST over E Marginal Way S built?

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

What condition is SW Spokane ST over E Marginal Way S 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 E Marginal Way S carry?

About 10,000 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SW Spokane ST over E Marginal Way S?

The structure is 2,357 ft (718.4 m) long with a longest span of 158 ft (48.2 m) and a deck 30 ft wide.

Who owns SW Spokane ST over E Marginal Way S?

It is owned by the City or Municipal Highway Agency.