US Bridges

Deadwood Road over Deadwood River

FairPosted for load

Valley County, Idaho · 1 N. Deadwood Resv · Structure no. 000000000033835

Built
1959
66 years old
Condition
Fair
inspected August 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
108 ft
3 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

Deadwood Road over Deadwood River is a steel continuous girder and floorbeam system carrying Deadwood Road over Deadwood River in Valley County, Idaho. It was built in 1959, so it is 66 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 30 vehicles a day, roughly 50% of them trucks, projected to reach 45 by 2042. The structure is 108 ft (32.9 m) long and 15 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesDeadwood Road
CrossesDeadwood River
Location1 N. Deadwood Resv
RouteCounty Highway 0
CountyValley County
StateIdaho
Coordinates44.34856, -115.65011
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating33 US tons
Inventory rating20 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckWood or timber
Main spans3
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span41 ft (12.5 m)
Deck width15 ft (4.5 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2042
Trucks50%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$963,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Deadwood Road over Deadwood River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Deadwood Road over Deadwood River 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 August 2024.

How much traffic does Deadwood Road over Deadwood River carry?

About 30 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is Deadwood Road over Deadwood River?

The structure is 108 ft (32.9 m) long with a longest span of 41 ft (12.5 m) and a deck 15 ft wide.

Who owns Deadwood Road over Deadwood River?

It is owned by the County Highway Agency.