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US 20 Frontage Rd over Fall River Overflow

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

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

US 20 Frontage Rd over Fall River Overflow in Fremont County, Idaho, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1932, making it 93 years old at the 2025 inventory.
It carries about 10 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 8 of the 138 inventoried bridges in Fremont County rated poor (5.8%); 8 (5.8%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

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