US Bridges

I-90 over SR 23

Fair

Lincoln County, Washington · 6.2 E Adams CO · Structure no. 0008244G0000000

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
115 ft
1 main span
Daily traffic
10,191
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over SR 23 is a prestressed concrete stringer/multi-beam or girder carrying I-90 over SR 23 in Lincoln County, Washington. It was built in 1967, so it is 58 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 10,191 vehicles a day, roughly 25% of them trucks, projected to reach 10,426 by 2039. The structure is 115 ft (35.1 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-90
CrossesSR 23
Location6.2 E Adams CO
RouteInterstate 90
CountyLincoln County
StateWashington
Coordinates47.30839, -117.97275
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.1 US tons
Inventory rating16.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length115 ft (35.1 m)
Longest span109 ft (33.1 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,191 (2023)
Projected traffic10,426 by 2039
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$2.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over SR 23 built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-90 over SR 23 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 2023.

How much traffic does I-90 over SR 23 carry?

About 10,191 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-90 over SR 23?

The structure is 115 ft (35.1 m) long with a longest span of 109 ft (33.1 m) and a deck 41 ft wide.

Who owns I-90 over SR 23?

It is owned by the State Highway Agency.