US Bridges

I-90 over Little Creek

Fair

Kittitas County, Washington · 21.9 E JCT SR 906 · Structure no. 0006883C0000000

Built
1962
63 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
45 ft
1 main span
Daily traffic
16,832
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Little Creek is a concrete slab carrying I-90 over Little Creek in Kittitas County, Washington. It was built in 1962, so it is 63 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 16,832 vehicles a day, roughly 23% of them trucks, projected to reach 21,760 by 2039. The structure is 45 ft (13.7 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-90
CrossesLittle Creek
Location21.9 E JCT SR 906
RouteInterstate 90
CountyKittitas County
StateWashington
Coordinates47.20433, -121.08053
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span38 ft (11.6 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,832 (2023)
Projected traffic21,760 by 2039
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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$855,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Little Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is I-90 over Little Creek 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 2023.

How much traffic does I-90 over Little Creek carry?

About 16,832 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Little Creek?

The structure is 45 ft (13.7 m) long with a longest span of 38 ft (11.6 m) and a deck 42 ft wide.

Who owns I-90 over Little Creek?

It is owned by the State Highway Agency.