Home › Idaho › Fremont County › US 20B over Twin Groves Canal

US 20B over Twin Groves Canal

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

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

US 20B over Twin Groves Canal in Fremont County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1992, making it 33 years old at the 2025 inventory.
It carries about 1,400 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 85 of the 138 inventoried bridges in Fremont County rated fair (61.6%); 8 (5.8%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

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