US Bridges

I-90 over SR 261

Fair

Adams County, Washington · 1.5 E JCT US 395 · Structure no. 0005761B0000000

Built
1952
73 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
169 ft
3 main spans
Daily traffic
8,405
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over SR 261 is a concrete continuous slab carrying I-90 over SR 261 in Adams County, Washington. It was built in 1952, so it is 73 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 8,405 vehicles a day, roughly 25% of them trucks, projected to reach 8,849 by 2039. The structure is 169 ft (51.5 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesSR 261
Location1.5 E JCT US 395
RouteInterstate 90
CountyAdams County
StateWashington
Coordinates47.11675, -118.36594
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 inspectionJuly 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 rating45 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length169 ft (51.5 m)
Longest span66 ft (20.1 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,405 (2023)
Projected traffic8,849 by 2039
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$3.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over SR 261 built?

It was built in 1952, making it 73 years old in 2025.

What condition is I-90 over SR 261 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 July 2024.

How much traffic does I-90 over SR 261 carry?

About 8,405 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-90 over SR 261?

The structure is 169 ft (51.5 m) long with a longest span of 66 ft (20.1 m) and a deck 35 ft wide.

Who owns I-90 over SR 261?

It is owned by the State Highway Agency.