US Bridges

I-182 over Np RY

Fair

Franklin County, Washington · 1.6 E JCT US 395 · Structure no. 0008422D0000000

Built
1968
57 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
456 ft
4 main spans
Daily traffic
27,462
2023 count
Owner
State
State Highway Agency

About this bridge

I-182 over Np RY is a steel continuous stringer/multi-beam or girder carrying I-182 over Np RY in Franklin County, Washington. It was built in 1968, so it is 57 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 27,462 vehicles a day, roughly 15% of them trucks, projected to reach 32,850 by 2039. The structure is 456 ft (139 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-182
CrossesNp RY
Location1.6 E JCT US 395
RouteInterstate 182
CountyFranklin County
StateWashington
Coordinates46.25008, -119.09375
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
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 rating48 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length456 ft (139 m)
Longest span128 ft (39 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,462 (2023)
Projected traffic32,850 by 2039
Trucks15%
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$11.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-182 over Np RY built?

It was built in 1968, making it 57 years old in 2025.

What condition is I-182 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 April 2023.

How much traffic does I-182 over Np RY carry?

About 27,462 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I-182 over Np RY?

The structure is 456 ft (139 m) long with a longest span of 128 ft (39 m) and a deck 41 ft wide.

Who owns I-182 over Np RY?

It is owned by the State Highway Agency.