I-90 over Brown Road

Fair

Lincoln County, Washington · 3.8 E JCT SR 23 · Structure no. 0008194A0000000

Built: 1967; 58 years old
Condition: Fair; inspected July 2024
Type: Slab; Concrete Continuous
Length: 128 ft; 3 main spans
Daily traffic: 10,697; 2023 count
Owner: State; State Highway Agency

About this bridge

I-90 over Brown Road is a concrete continuous slab carrying I-90 over Brown Road 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 10,697 vehicles a day, roughly 25% of them trucks, projected to reach 11,014 by 2039. The structure is 128 ft (39 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90

CrossesBrown Road

Location3.8 E JCT SR 23

RouteInterstate 90

CountyLincoln County

StateWashington

Coordinates47.34033, -117.90819

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.

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.

Last inspectionJuly 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourBridge not over waterway

Structural evaluation6: Equal to present minimum criteria

Deck geometry6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating43.2 US tons

Inventory rating33.6 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20 + Mod

Structure length128 ft (39 m)

Longest span51 ft (15.5 m)

Deck width41 ft (12.6 m)

Roadway width38 ft (11.6 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,697 (2023)

Projected traffic11,014 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$2.7 million (2022 estimate)

NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over Brown Road built?

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

What condition is I-90 over Brown Road 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 July 2024.

How much traffic does I-90 over Brown Road carry?

About 10,697 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-90 over Brown Road?

The structure is 128 ft (39 m) long with a longest span of 51 ft (15.5 m) and a deck 41 ft wide.

Who owns I-90 over Brown Road?

It is owned by the State Highway Agency.