US Bridges

Jim DAVIS/3400 over Thorn Creek

FairPosted for load

Whitman County, Washington · 0.02 MI S Thorn Creek · Structure no. 081035000000000

Built
1963
62 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
25
2021 count
Owner
County
County Highway Agency

About this bridge

Jim DAVIS/3400 over Thorn Creek is a prestressed concrete tee beam carrying Jim DAVIS/3400 over Thorn Creek in Whitman County, Washington. It was built in 1963, so it is 62 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. Its operating status is: posted for load restriction.

It carries about 25 vehicles a day, roughly 25% of them trucks, projected to reach 26 by 2044. The structure is 44 ft (13.4 m) long and 18 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesJim DAVIS/3400
CrossesThorn Creek
Location0.02 MI S Thorn Creek
RouteCounty Highway 34000
CountyWhitman County
StateWashington
Coordinates47.15487, -117.50315
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating27.9 US tons
Inventory rating21.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2021)
Projected traffic26 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Jim DAVIS/3400 over Thorn Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Jim DAVIS/3400 over Thorn 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 December 2023.

How much traffic does Jim DAVIS/3400 over Thorn Creek carry?

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

How long is Jim DAVIS/3400 over Thorn Creek?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 18 ft wide.

Who owns Jim DAVIS/3400 over Thorn Creek?

It is owned by the County Highway Agency.