US Bridges

S Spokane ST over E Marginal Wy 1st 4th

Fair

King County, Washington · S Spokane ST & E Marginal · Structure no. 085262000000000

Built
1941
84 years old, rebuilt 2012
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
3,410 ft
5 main spans
Daily traffic
42,350
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

S Spokane ST over E Marginal Wy 1st 4th is a concrete stringer/multi-beam or girder carrying S Spokane ST over E Marginal Wy 1st 4th in King County, Washington. It was built in 1941 and reconstructed in 2012, so it is 84 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 42,350 vehicles a day, roughly 10% of them trucks, projected to reach 51,700 by 2042. The structure is 3,410 ft (1,039.4 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS Spokane ST
CrossesE Marginal Wy 1st 4th
LocationS Spokane ST & E Marginal
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.57139, -122.33222
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating20.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5 (+63 approach)
Design loadHS 20
Structure length3,410 ft (1,039.4 m)
Longest span75 ft (22.9 m)
Deck width67 ft (20.4 m)
Roadway width67 ft (20.4 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic42,350 (2021)
Projected traffic51,700 by 2042
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$76.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was S Spokane ST over E Marginal Wy 1st 4th built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2012.

What condition is S Spokane ST over E Marginal Wy 1st 4th 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 2023.

How much traffic does S Spokane ST over E Marginal Wy 1st 4th carry?

About 42,350 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is S Spokane ST over E Marginal Wy 1st 4th?

The structure is 3,410 ft (1,039.4 m) long with a longest span of 75 ft (22.9 m) and a deck 67 ft wide.

Who owns S Spokane ST over E Marginal Wy 1st 4th?

It is owned by the City or Municipal Highway Agency.