US Bridges

SR 27 over S Fk Palouse River

Good

Whitman County, Washington · 0.1 N JCT SR 270 · Structure no. 0010229A0000000

Built
1977
48 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
106 ft
1 main span
Daily traffic
18,772
2023 count
Owner
State
State Highway Agency

About this bridge

SR 27 over S Fk Palouse River is a prestressed concrete stringer/multi-beam or girder carrying SR 27 over S Fk Palouse River in Whitman County, Washington. It was built in 1977, so it is 48 years old, younger 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 18,772 vehicles a day, roughly 2% of them trucks, projected to reach 21,920 by 2039. The structure is 106 ft (32.3 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 27
CrossesS Fk Palouse River
Location0.1 N JCT SR 270
RouteState Highway 27
Coordinates46.73176, -117.17996
Functional classUrban Other Principal Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span102 ft (31.1 m)
Deck width68 ft (20.6 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,772 (2023)
Projected traffic21,920 by 2039
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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$3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 27 over S Fk Palouse River built?

It was built in 1977, making it 48 years old in 2025.

What condition is SR 27 over S Fk Palouse River 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 May 2023.

How much traffic does SR 27 over S Fk Palouse River carry?

About 18,772 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is SR 27 over S Fk Palouse River?

The structure is 106 ft (32.3 m) long with a longest span of 102 ft (31.1 m) and a deck 68 ft wide.

Who owns SR 27 over S Fk Palouse River?

It is owned by the State Highway Agency.