US Bridges

Custer Motorway over Yankee Fork

Fair

Custer County, Idaho · No Data Entered · Structure no. 041303000003012

Built
2004
21 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
44 ft
1 main span
Daily traffic
100
Owner
Federal
U.S. Forest Service

About this bridge

Custer Motorway over Yankee Fork is a wood or timber stringer/multi-beam or girder carrying Custer Motorway over Yankee Fork in Custer County, Idaho. It was built in 2004, so it is 21 years old, younger 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 100 vehicles a day, roughly 1% of them trucks, projected to reach 150 by 2045. The structure is 44 ft (13.4 m) long and 16 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

CarriesCuster Motorway
CrossesYankee Fork
LocationNo Data Entered
RouteFederal Lands Road 40070
StateIdaho
Coordinates44.41214, -114.64093
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating19.3 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (—)
Projected traffic150 by 2045
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 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 Custer Motorway over Yankee Fork built?

It was built in 2004, making it 21 years old in 2025.

What condition is Custer Motorway over Yankee Fork 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 September 2024.

How much traffic does Custer Motorway over Yankee Fork carry?

About 100 vehicles per day (latest count), of which roughly 1% are trucks.

How long is Custer Motorway over Yankee Fork?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 16 ft wide.

Who owns Custer Motorway over Yankee Fork?

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