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E 500 N over St. Anthony Union Canal

Fremont County, Idaho · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

E 500 N over St. Anthony Union Canal in Fremont County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
It was built in 1995, making it 30 years old at the 2025 inventory.
It carries about 780 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 45 of the 138 inventoried bridges in Fremont County rated good (32.6%); 8 (5.8%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 36 ft
Location	0.9 W. St. Anthony
NBI structure number	000000000031891
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.

Bridge	Built	Vehicles/day	Condition
US 20 Ebl & Wbl over Salem Union Canal	1984	12,500	Fair
US 20 over 2290 E	1984	12,500	Fair
US 20B over Henrys Fk. Snake River	1965	11,500	Fair
US 20B over Egin Canal	1975	11,500	Good
US 20 Wbl & Ebl over S.fk.fall River Canal	1973	10,500	Fair
US 20 Ebl & Wbl over Salem Union Canal	1979	9,100	Fair