US Bridges

Stc 7456;IONA Road over Idaho Canal

Fair

Bonneville County, Idaho · 2.4 N. 1.2 E. Idaho Falls · Structure no. 000000000031085

Built
1960
65 years old
Condition
Fair
inspected March 2024
Type
Channel Beam
Prestressed Concrete
Length
76 ft
2 main spans
Daily traffic
2,600
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 7456;IONA Road over Idaho Canal is a prestressed concrete channel beam carrying Stc 7456;IONA Road over Idaho Canal in Bonneville 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 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 2,600 vehicles a day, roughly 13% of them trucks, projected to reach 3,900 by 2042. The structure is 76 ft (23.2 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesStc 7456;IONA Road
CrossesIdaho Canal
Location2.4 N. 1.2 E. Idaho Falls
RouteCounty Highway 7456
CountyBonneville County
StateIdaho
Coordinates43.52597, -112.01419
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span37 ft (11.3 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2023)
Projected traffic3,900 by 2042
Trucks13%
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

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$828,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 7456;IONA Road over Idaho Canal built?

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

What condition is Stc 7456;IONA Road over Idaho Canal 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 March 2024.

How much traffic does Stc 7456;IONA Road over Idaho Canal carry?

About 2,600 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Stc 7456;IONA Road over Idaho Canal?

The structure is 76 ft (23.2 m) long with a longest span of 37 ft (11.3 m) and a deck 30 ft wide.

Who owns Stc 7456;IONA Road over Idaho Canal?

It is owned by the County Highway Agency.