US Bridges

US 97 over I-90 West Ellensburg

Fair

Kittitas County, Washington · JCT I-90 · Structure no. 0007830B0000000

Built
1966
59 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
272 ft
4 main spans
Daily traffic
11,556
2023 count
Owner
State
State Highway Agency

About this bridge

US 97 over I-90 West Ellensburg is a prestressed concrete stringer/multi-beam or girder carrying US 97 over I-90 West Ellensburg in Kittitas County, Washington. It was built in 1966, so it is 59 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 11,556 vehicles a day, roughly 23% of them trucks, projected to reach 13,899 by 2039. The structure is 272 ft (82.9 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 97
CrossesI-90 West Ellensburg
LocationJCT I-90
RouteU.S. Route 97
CountyKittitas County
StateWashington
Coordinates47.00569, -120.59153
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating19.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length272 ft (82.9 m)
Longest span90 ft (27.4 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,556 (2023)
Projected traffic13,899 by 2039
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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$5.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 97 over I-90 West Ellensburg built?

It was built in 1966, making it 59 years old in 2025.

What condition is US 97 over I-90 West Ellensburg 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 US 97 over I-90 West Ellensburg carry?

About 11,556 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is US 97 over I-90 West Ellensburg?

The structure is 272 ft (82.9 m) long with a longest span of 90 ft (27.4 m) and a deck 33 ft wide.

Who owns US 97 over I-90 West Ellensburg?

It is owned by the State Highway Agency.