US Bridges

SR 26 over Alkali Flat CR

Good

Whitman County, Washington · 2.2 E JCT SR 127 · Structure no. 0009123B0000000

Built
1972
53 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
76 ft
3 main spans
Daily traffic
2,249
2023 count
Owner
State
State Highway Agency

About this bridge

SR 26 over Alkali Flat CR is a concrete continuous slab carrying SR 26 over Alkali Flat CR in Whitman County, Washington. It was built in 1972, so it is 53 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,249 vehicles a day, roughly 22% of them trucks, projected to reach 3,198 by 2039. The structure is 76 ft (23.2 m) long and 43 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR 26
CrossesAlkali Flat CR
Location2.2 E JCT SR 127
RouteState Highway 26
CountyWhitman County
StateWashington
Coordinates46.81328, -117.60939
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating38.3 US tons
Inventory rating29.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length76 ft (23.2 m)
Longest span30 ft (9.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,249 (2023)
Projected traffic3,198 by 2039
Trucks22%
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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 26 over Alkali Flat CR built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR 26 over Alkali Flat CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does SR 26 over Alkali Flat CR carry?

About 2,249 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is SR 26 over Alkali Flat CR?

The structure is 76 ft (23.2 m) long with a longest span of 30 ft (9.1 m) and a deck 43 ft wide.

Who owns SR 26 over Alkali Flat CR?

It is owned by the State Highway Agency.