US Bridges

Danskin Road over S. Fk. Boise River

Fair

Elmore County, Idaho · 7 MI NW Andrsn Rnch Dam · Structure no. 040201000001202

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
176 ft
3 main spans
Daily traffic
10
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Danskin Road over S. Fk. Boise River is a steel continuous stringer/multi-beam or girder carrying Danskin Road over S. Fk. Boise River in Elmore County, Idaho. It was built in 1957, so it is 68 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 5 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 10 vehicles a day, projected to reach 15 by 2045. The structure is 176 ft (53.7 m) long and 14 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesDanskin Road
CrossesS. Fk. Boise River
Location7 MI NW Andrsn Rnch Dam
RouteFederal Lands Road 165
CountyElmore County
StateIdaho
Coordinates43.40493, -115.56574
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.7 US tons
Inventory rating15.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckWood or timber
Main spans3
Design loadH 20
Structure length176 ft (53.7 m)
Longest span67 ft (20.4 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (3.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (1992)
Projected traffic15 by 2045
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 Danskin Road over S. Fk. Boise River built?

It was built in 1957, making it 68 years old in 2025.

What condition is Danskin Road over S. Fk. Boise 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 September 2023.

How much traffic does Danskin Road over S. Fk. Boise River carry?

About 10 vehicles per day (1992 count).

How long is Danskin Road over S. Fk. Boise River?

The structure is 176 ft (53.7 m) long with a longest span of 67 ft (20.4 m) and a deck 14 ft wide.

Who owns Danskin Road over S. Fk. Boise River?

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