US Bridges

I-90 over Moses Lake

Fair

Grant County, Washington · 23.8 E JCT SR 281 · Structure no. 0005705B0000000

Built
1958
67 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
254 ft
5 main spans
Daily traffic
13,711
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Moses Lake is a concrete continuous slab carrying I-90 over Moses Lake in Grant County, Washington. It was built in 1958, so it is 67 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 13,711 vehicles a day, roughly 23% of them trucks, projected to reach 16,891 by 2039. The structure is 254 ft (77.4 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-90
CrossesMoses Lake
Location23.8 E JCT SR 281
RouteInterstate 90
CountyGrant County
StateWashington
Coordinates47.10294, -119.32361
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span54 ft (16.5 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,711 (2023)
Projected traffic16,891 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$5.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Moses Lake built?

It was built in 1958, making it 67 years old in 2025.

What condition is I-90 over Moses Lake 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 October 2024.

How much traffic does I-90 over Moses Lake carry?

About 13,711 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Moses Lake?

The structure is 254 ft (77.4 m) long with a longest span of 54 ft (16.5 m) and a deck 34 ft wide.

Who owns I-90 over Moses Lake?

It is owned by the State Highway Agency.