US Bridges

I-90 over Dry Relief

Fair

Kittitas County, Washington · 10.1 E JCT I-82 · Structure no. 0008377A0000000

Built
1968
57 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
211 ft
2 main spans
Daily traffic
8,811
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Dry Relief is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over Dry Relief in Kittitas County, Washington. It was built in 1968, so it is 57 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 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 8,811 vehicles a day, roughly 28% of them trucks, projected to reach 10,702 by 2039. The structure is 211 ft (64.3 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesDry Relief
Location10.1 E JCT I-82
RouteInterstate 90
CountyKittitas County
StateWashington
Coordinates46.95609, -120.30431
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJuly 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.3 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length211 ft (64.3 m)
Longest span104 ft (31.7 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,811 (2023)
Projected traffic10,702 by 2039
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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$4.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over Dry Relief built?

It was built in 1968, making it 57 years old in 2025.

What condition is I-90 over Dry Relief 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 2023.

How much traffic does I-90 over Dry Relief carry?

About 8,811 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I-90 over Dry Relief?

The structure is 211 ft (64.3 m) long with a longest span of 104 ft (31.7 m) and a deck 41 ft wide.

Who owns I-90 over Dry Relief?

It is owned by the State Highway Agency.