US Bridges

Frontage Road over Uprr; Igo Overpass

Fair

Power County, Idaho · 4.3 E. American Falls · Structure no. 000000000010930

Built
1935
90 years old, rebuilt 2009
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete Continuous
Length
181 ft
3 main spans
Daily traffic
623
2023 count
Owner
County
County Highway Agency

About this bridge

Frontage Road over Uprr; Igo Overpass is a concrete continuous tee beam carrying Frontage Road over Uprr; Igo Overpass in Power County, Idaho. It was built in 1935 and reconstructed in 2009, so it is 90 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.

It carries about 623 vehicles a day, roughly 51% of them trucks, projected to reach 934 by 2042. The structure is 181 ft (55.2 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFrontage Road
CrossesUprr; Igo Overpass
Location4.3 E. American Falls
RouteCounty Highway 0
CountyPower County
StateIdaho
Coordinates42.83711, -112.77115
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length181 ft (55.2 m)
Longest span61 ft (18.6 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic623 (2023)
Projected traffic934 by 2042
Trucks51%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Frontage Road over Uprr; Igo Overpass built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2009.

What condition is Frontage Road over Uprr; Igo Overpass 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 April 2024.

How much traffic does Frontage Road over Uprr; Igo Overpass carry?

About 623 vehicles per day (2023 count), of which roughly 51% are trucks.

How long is Frontage Road over Uprr; Igo Overpass?

The structure is 181 ft (55.2 m) long with a longest span of 61 ft (18.6 m) and a deck 30 ft wide.

Who owns Frontage Road over Uprr; Igo Overpass?

It is owned by the County Highway Agency.