US Bridges

DAVIS/4015 over Wassum Creek

Fair

Whitman County, Washington · 1.14 MI SW SR 23 · Structure no. 081955000000000

Built
1964
61 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
33
2021 count
Owner
County
County Highway Agency

About this bridge

DAVIS/4015 over Wassum Creek is a prestressed concrete tee beam carrying DAVIS/4015 over Wassum Creek in Whitman County, Washington. It was built in 1964, so it is 61 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 5 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 33 vehicles a day, roughly 25% of them trucks, projected to reach 34 by 2044. The structure is 31 ft (9.4 m) long and 24 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesDAVIS/4015
CrossesWassum Creek
Location1.14 MI SW SR 23
RouteCounty Highway 40150
CountyWhitman County
StateWashington
Coordinates47.14453, -117.8791
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating42.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33 (2021)
Projected traffic34 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was DAVIS/4015 over Wassum Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is DAVIS/4015 over Wassum Creek 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 November 2023.

How much traffic does DAVIS/4015 over Wassum Creek carry?

About 33 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is DAVIS/4015 over Wassum Creek?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns DAVIS/4015 over Wassum Creek?

It is owned by the County Highway Agency.