US Bridges

SR 970 over I-90 E Cle Elum

Fair

Kittitas County, Washington · JCT I-90 · Structure no. 0007752B0000000

Built
1966
59 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
229 ft
4 main spans
Daily traffic
2,922
2023 count
Owner
State
State Highway Agency

About this bridge

SR 970 over I-90 E Cle Elum is a prestressed concrete stringer/multi-beam or girder carrying SR 970 over I-90 E Cle Elum 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 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 2,922 vehicles a day, roughly 19% of them trucks, projected to reach 3,495 by 2039. The structure is 229 ft (69.8 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 970
CrossesI-90 E Cle Elum
LocationJCT I-90
RouteState Highway 970
CountyKittitas County
StateWashington
Coordinates47.18303, -120.90327
Functional classRural Principal Arterial - Other

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length229 ft (69.8 m)
Longest span75 ft (22.9 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,922 (2023)
Projected traffic3,495 by 2039
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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$4.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 970 over I-90 E Cle Elum built?

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

What condition is SR 970 over I-90 E Cle Elum 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 August 2023.

How much traffic does SR 970 over I-90 E Cle Elum carry?

About 2,922 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is SR 970 over I-90 E Cle Elum?

The structure is 229 ft (69.8 m) long with a longest span of 75 ft (22.9 m) and a deck 32 ft wide.

Who owns SR 970 over I-90 E Cle Elum?

It is owned by the State Highway Agency.