US Bridges

SR 26 over Willow Creek

Poor

Whitman County, Washington · 9.3 E Adams CO · Structure no. 0008153C0000000

Built
1967
58 years old
Condition
Poor
inspected March 2023
Type
Slab
Concrete Continuous
Length
65 ft
3 main spans
Daily traffic
1,655
2023 count
Owner
State
State Highway Agency

About this bridge

SR 26 over Willow Creek is a concrete continuous slab carrying SR 26 over Willow Creek in Whitman 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,655 vehicles a day, roughly 21% of them trucks, projected to reach 2,115 by 2039. The structure is 65 ft (19.7 m) long and 37 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSR 26
CrossesWillow Creek
Location9.3 E Adams CO
RouteState Highway 26
Coordinates46.79722, -117.86867
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length65 ft (19.7 m)
Longest span44 ft (13.4 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,655 (2023)
Projected traffic2,115 by 2039
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 26 over Willow Creek built?

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

What condition is SR 26 over Willow Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does SR 26 over Willow Creek carry?

About 1,655 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is SR 26 over Willow Creek?

The structure is 65 ft (19.7 m) long with a longest span of 44 ft (13.4 m) and a deck 37 ft wide.

Who owns SR 26 over Willow Creek?

It is owned by the State Highway Agency.