US Bridges

I-90 over Np RY

Fair

Spokane County, Washington · 5.8 E JCT SR 902 · Structure no. 0007903C0000000

Built
1966
59 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
150 ft
3 main spans
Daily traffic
11,409
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Np RY is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over Np RY in Spokane County, Washington. It was built in 1966, so it is 59 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 11,409 vehicles a day, roughly 25% of them trucks, projected to reach 13,699 by 2039. The structure is 150 ft (45.7 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-90
CrossesNp RY
Location5.8 E JCT SR 902
RouteInterstate 90
Coordinates47.56178, -117.60172
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length150 ft (45.7 m)
Longest span50 ft (15.2 m)
Deck width39 ft (12 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,409 (2023)
Projected traffic13,699 by 2039
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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$2.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over Np RY built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-90 over Np RY 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 Np RY carry?

About 11,409 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-90 over Np RY?

The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 39 ft wide.

Who owns I-90 over Np RY?

It is owned by the State Highway Agency.