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US 20 over Buffalo River;ponds Br.

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

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

US 20 over Buffalo River;ponds Br. 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 substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1975 and reconstructed in 2011, making it 50 years old at the 2025 inventory.
It carries about 6,500 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


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 180 ft
Location	5.7 S. Macks Inn
NBI structure number	000000000012680
Condition class	Fair

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