US Bridges

SW Spokane ST over Klickitat E Marginal RR

Fair

King County, Washington · 1200 SW Spokane ST · Structure no. 085948000000000

Built
1991
34 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
925 ft
6 main spans
Daily traffic
11,000
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

SW Spokane ST over Klickitat E Marginal RR is a prestressed concrete continuous stringer/multi-beam or girder carrying SW Spokane ST over Klickitat E Marginal RR in King County, Washington. It was built in 1991, so it is 34 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 11,000 vehicles a day, roughly 30% of them trucks, projected to reach 15,000 by 2039. The structure is 925 ft (281.9 m) long and 51 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSW Spokane ST
CrossesKlickitat E Marginal RR
Location1200 SW Spokane ST
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.57137, -122.35727
Functional classUrban Collector

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 inspectionApril 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length925 ft (281.9 m)
Longest span164 ft (50 m)
Deck width51 ft (15.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2019)
Projected traffic15,000 by 2039
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$15.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW Spokane ST over Klickitat E Marginal RR built?

It was built in 1991, making it 34 years old in 2025.

What condition is SW Spokane ST over Klickitat E Marginal RR 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 SW Spokane ST over Klickitat E Marginal RR carry?

About 11,000 vehicles per day (2019 count), of which roughly 30% are trucks.

How long is SW Spokane ST over Klickitat E Marginal RR?

The structure is 925 ft (281.9 m) long with a longest span of 164 ft (50 m) and a deck 51 ft wide.

Who owns SW Spokane ST over Klickitat E Marginal RR?

It is owned by the City or Municipal Highway Agency.