US Bridges

DAVIS/4015 over Unnamed Drainage

Good

Whitman County, Washington · 7.03 MI SW SR 23 · Structure no. 086502000000000

Built
1999
26 years old
Condition
Good
inspected November 2023
Type
Culvert
Steel
Length
23 ft
2 main spans
Daily traffic
3
2021 count
Owner
County
County Highway Agency

About this bridge

DAVIS/4015 over Unnamed Drainage is a steel culvert carrying DAVIS/4015 over Unnamed Drainage in Whitman County, Washington. It was built in 1999, so it is 26 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 3 vehicles a day, roughly 33% of them trucks, projected to reach 4 by 2044. The structure is 23 ft (7 m) long. If it were closed, the detour would be 18 mi (29 km).

CarriesDAVIS/4015
CrossesUnnamed Drainage
Location7.03 MI SW SR 23
RouteCounty Highway 40150
Coordinates47.08045, -117.93363
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating90.7 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3 (2021)
Projected traffic4 by 2044
Trucks33%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$300,000
NavigationNo navigation control on waterway

Frequently asked questions

When was DAVIS/4015 over Unnamed Drainage built?

It was built in 1999, making it 26 years old in 2025.

What condition is DAVIS/4015 over Unnamed Drainage 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 November 2023.

How much traffic does DAVIS/4015 over Unnamed Drainage carry?

About 3 vehicles per day (2021 count), of which roughly 33% are trucks.

How long is DAVIS/4015 over Unnamed Drainage?

The structure is 23 ft (7 m) long with a longest span of 9 ft (2.7 m).

Who owns DAVIS/4015 over Unnamed Drainage?

It is owned by the County Highway Agency.