US Bridges

IRR BIA RTE 901 over Owyhee River

Good

Owyhee County, Idaho · 9.8 KM NW Owyhee Agency · Structure no. 00000000000H312

Built
1987
38 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
115 ft
1 main span
Daily traffic
20
2024 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 901 over Owyhee River is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE 901 over Owyhee River in Owyhee County, Idaho. It was built in 1987, so it is 38 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20 vehicles a day, roughly 10% of them trucks, projected to reach 24 by 2044. The structure is 115 ft (35.1 m) long and 31 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesIRR BIA RTE 901
CrossesOwyhee River
Location9.8 KM NW Owyhee Agency
RouteFederal Lands Road 901
StateIdaho
Coordinates42.01195, -116.16051
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating43.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length115 ft (35.1 m)
Longest span113 ft (34.4 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2024)
Projected traffic24 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE 901 over Owyhee River built?

It was built in 1987, making it 38 years old in 2025.

What condition is IRR BIA RTE 901 over Owyhee River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does IRR BIA RTE 901 over Owyhee River carry?

About 20 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is IRR BIA RTE 901 over Owyhee River?

The structure is 115 ft (35.1 m) long with a longest span of 113 ft (34.4 m) and a deck 31 ft wide.

Who owns IRR BIA RTE 901 over Owyhee River?

It is owned by the Bureau of Indian Affairs.