US Bridges

E 500 N over St. Anthony Union Canal

Good

Fremont County, Idaho · 0.9 W. St. Anthony · Structure no. 000000000031891

Built
1995
30 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
780
2023 count
Owner
County
County Highway Agency

About this bridge

E 500 N over St. Anthony Union Canal is a prestressed concrete tee beam carrying E 500 N over St. Anthony Union Canal in Fremont County, Idaho. It was built in 1995, so it is 30 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 780 vehicles a day, roughly 5% of them trucks, projected to reach 1,170 by 2039. The structure is 36 ft (11 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesE 500 N
CrossesSt. Anthony Union Canal
Location0.9 W. St. Anthony
RouteCounty Highway 0
CountyFremont County
StateIdaho
Coordinates43.96022, -111.70019
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic780 (2023)
Projected traffic1,170 by 2039
Trucks5%
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$488,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was E 500 N over St. Anthony Union Canal built?

It was built in 1995, making it 30 years old in 2025.

What condition is E 500 N over St. Anthony Union Canal 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 November 2024.

How much traffic does E 500 N over St. Anthony Union Canal carry?

About 780 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is E 500 N over St. Anthony Union Canal?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 32 ft wide.

Who owns E 500 N over St. Anthony Union Canal?

It is owned by the County Highway Agency.