US Bridges

I 86B over Uprr;american Falls Op

Good

Power County, Idaho · 0.2 W. American Falls · Structure no. 000000000014140

Built
1990
35 years old
Condition
Good
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
128 ft
1 main span
Daily traffic
3,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 86B over Uprr;american Falls Op is a prestressed concrete stringer/multi-beam or girder carrying I 86B over Uprr;american Falls Op in Power 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 3,500 vehicles a day, roughly 10% of them trucks, projected to reach 5,250 by 2042. The structure is 128 ft (39 m) long and 57 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 86B
CrossesUprr;american Falls Op
Location0.2 W. American Falls
RouteInterstate 86
CountyPower County
StateIdaho
Coordinates42.78569, -112.85883
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating105.1 US tons
Inventory rating64 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length128 ft (39 m)
Longest span124 ft (37.8 m)
Deck width57 ft (17.5 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2023)
Projected traffic5,250 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 86B over Uprr;american Falls Op built?

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

What condition is I 86B over Uprr;american Falls Op 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 August 2022.

How much traffic does I 86B over Uprr;american Falls Op carry?

About 3,500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I 86B over Uprr;american Falls Op?

The structure is 128 ft (39 m) long with a longest span of 124 ft (37.8 m) and a deck 57 ft wide.

Who owns I 86B over Uprr;american Falls Op?

It is owned by the State Highway Agency.