US Bridges

I 86B over Uprr;amr.Falls North Op

Fair

Power County, Idaho · 0.7 N. American Falls · Structure no. 000000000014138

Built
1992
33 years old
Condition
Fair
inspected November 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
414 ft
3 main spans
Daily traffic
4,100
2023 count
Owner
State
State Highway Agency

About this bridge

I 86B over Uprr;amr.Falls North Op is a steel continuous stringer/multi-beam or girder carrying I 86B over Uprr;amr.Falls North Op in Power County, Idaho. It was built in 1992, so it is 33 years old, younger 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 6 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 4,100 vehicles a day, roughly 23% of them trucks, projected to reach 6,150 by 2042. The structure is 414 ft (126.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 86B
CrossesUprr;amr.Falls North Op
Location0.7 N. American Falls
RouteInterstate 86
CountyPower County
StateIdaho
Coordinates42.79458, -112.85342
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length414 ft (126.2 m)
Longest span153 ft (46.6 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2023)
Projected traffic6,150 by 2042
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 86B over Uprr;amr.Falls North Op built?

It was built in 1992, making it 33 years old in 2025.

What condition is I 86B over Uprr;amr.Falls North Op 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 November 2022.

How much traffic does I 86B over Uprr;amr.Falls North Op carry?

About 4,100 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I 86B over Uprr;amr.Falls North Op?

The structure is 414 ft (126.2 m) long with a longest span of 153 ft (46.6 m) and a deck 40 ft wide.

Who owns I 86B over Uprr;amr.Falls North Op?

It is owned by the State Highway Agency.