US Bridges

Corral Canyon Road over N. Fk. Big Lost River

Fair

Custer County, Idaho · No Data Entered · Structure no. 040604000001131

Built
1979
46 years old, rebuilt 1999
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
26 ft
1 main span
Daily traffic
40
1994 count
Owner
Federal
U.S. Forest Service

About this bridge

Corral Canyon Road over N. Fk. Big Lost River is a wood or timber stringer/multi-beam or girder carrying Corral Canyon Road over N. Fk. Big Lost River in Custer County, Idaho. It was built in 1979 and reconstructed in 1999, so it is 46 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.

It carries about 40 vehicles a day, projected to reach 50 by 2015. The structure is 26 ft (7.9 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesCorral Canyon Road
CrossesN. Fk. Big Lost River
LocationNo Data Entered
RouteFederal Lands Road 40043
CountyCuster County
StateIdaho
Coordinates43.93763, -114.25159
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (1994)
Projected traffic50 by 2015
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Corral Canyon Road over N. Fk. Big Lost River built?

It was built in 1979, making it 46 years old in 2025. It was reconstructed in 1999.

What condition is Corral Canyon Road over N. Fk. Big Lost 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 October 2024.

How much traffic does Corral Canyon Road over N. Fk. Big Lost River carry?

About 40 vehicles per day (1994 count).

How long is Corral Canyon Road over N. Fk. Big Lost River?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 15 ft wide.

Who owns Corral Canyon Road over N. Fk. Big Lost River?

It is owned by the U.S. Forest Service.