US Bridges

SR 23 over Np RY

Fair

Lincoln County, Washington · 3.8 N Whitman CO · Structure no. 0008244B0000000

Built
1967
58 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
203 ft
3 main spans
Daily traffic
1,370
2023 count
Owner
State
State Highway Agency

About this bridge

SR 23 over Np RY is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 23 over Np RY 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 1,370 vehicles a day, roughly 18% of them trucks, projected to reach 1,416 by 2039. The structure is 203 ft (61.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 23
CrossesNp RY
Location3.8 N Whitman CO
RouteState Highway 23
CountyLincoln County
StateWashington
Coordinates47.30106, -117.97319
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 rating66 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length203 ft (61.9 m)
Longest span73 ft (22.3 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,370 (2023)
Projected traffic1,416 by 2039
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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$3.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 23 over Np RY built?

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

What condition is SR 23 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 September 2023.

How much traffic does SR 23 over Np RY carry?

About 1,370 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is SR 23 over Np RY?

The structure is 203 ft (61.9 m) long with a longest span of 73 ft (22.3 m) and a deck 41 ft wide.

Who owns SR 23 over Np RY?

It is owned by the State Highway Agency.