US Bridges

IRR BIA RTE 152 over Portneuf River

FairPosted for load

Bannock County, Idaho · 5KM N of I-86 at SR30 Exi · Structure no. 00000000000P433

Built
1960
65 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
121 ft
4 main spans
Daily traffic
600
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 152 over Portneuf River is a concrete tee beam carrying IRR BIA RTE 152 over Portneuf River in Bannock County, Idaho. It was built in 1960, so it is 65 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. Its operating status is: posted for load restriction.

It carries about 600 vehicles a day, roughly 15% of them trucks, projected to reach 1,200 by 2043. The structure is 121 ft (36.8 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesIRR BIA RTE 152
CrossesPortneuf River
Location5KM N of I-86 at SR30 Exi
RouteFederal Lands Road 152
CountyBannock County
StateIdaho
Coordinates42.93502, -112.54494
Functional classRural Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating9.9 US tons
Inventory rating6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length121 ft (36.8 m)
Longest span31 ft (9.3 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2023)
Projected traffic1,200 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR BIA RTE 152 over Portneuf River built?

It was built in 1960, making it 65 years old in 2025.

What condition is IRR BIA RTE 152 over Portneuf 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 June 2023.

How much traffic does IRR BIA RTE 152 over Portneuf River carry?

About 600 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is IRR BIA RTE 152 over Portneuf River?

The structure is 121 ft (36.8 m) long with a longest span of 31 ft (9.3 m) and a deck 27 ft wide.

Who owns IRR BIA RTE 152 over Portneuf River?

It is owned by the Bureau of Indian Affairs.