US Bridges

Elk Heights over I-90

Fair

Kittitas County, Washington · 7.8 E JCT SR 970 · Structure no. 0007633A0000000

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
266 ft
4 main spans
Daily traffic
321
2012 count
Owner
State
State Highway Agency

About this bridge

Elk Heights over I-90 is a prestressed concrete continuous stringer/multi-beam or girder carrying Elk Heights over I-90 in Kittitas County, Washington. It was built in 1965, so it is 60 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 321 vehicles a day, roughly 5% of them trucks. The structure is 266 ft (81.1 m) long and 29 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesElk Heights
CrossesI-90
Location7.8 E JCT SR 970
RouteCounty Highway 0
CountyKittitas County
StateWashington
Coordinates47.11425, -120.791
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length266 ft (81.1 m)
Longest span76 ft (23.2 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic321 (2012)
Projected traffic—
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed16.8 mi (27 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$3.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Elk Heights over I-90 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Elk Heights over I-90 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 June 2024.

How much traffic does Elk Heights over I-90 carry?

About 321 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is Elk Heights over I-90?

The structure is 266 ft (81.1 m) long with a longest span of 76 ft (23.2 m) and a deck 29 ft wide.

Who owns Elk Heights over I-90?

It is owned by the State Highway Agency.