US Bridges

IRR BIA RTE 59 over Blackfoot River

Good

Bingham County, Idaho · 13 KM SW of Blackfoot · Structure no. 00000000000P411

Built
1990
35 years old
Condition
Good
inspected June 2023
Type
Slab
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
110
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 59 over Blackfoot River is a prestressed concrete slab carrying IRR BIA RTE 59 over Blackfoot River in Bingham County, Idaho. It was built in 1990, so it is 35 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 110 vehicles a day, roughly 5% of them trucks, projected to reach 230 by 2043. The structure is 80 ft (24.4 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIRR BIA RTE 59
CrossesBlackfoot River
Location13 KM SW of Blackfoot
RouteFederal Lands Road 59
StateIdaho
Coordinates43.14386, -112.43547
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
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 rating71.4 US tons
Inventory rating42.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length80 ft (24.4 m)
Longest span77 ft (23.5 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic230 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR BIA RTE 59 over Blackfoot River built?

It was built in 1990, making it 35 years old in 2025.

What condition is IRR BIA RTE 59 over Blackfoot 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 June 2023.

How much traffic does IRR BIA RTE 59 over Blackfoot River carry?

About 110 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is IRR BIA RTE 59 over Blackfoot River?

The structure is 80 ft (24.4 m) long with a longest span of 77 ft (23.5 m) and a deck 36 ft wide.

Who owns IRR BIA RTE 59 over Blackfoot River?

It is owned by the Bureau of Indian Affairs.