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E 121 St S over Idaho Canal; Hampton Br

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

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

E 121 St S over Idaho Canal; Hampton Br in Bonneville County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 9 (excellent condition) on the 0-9 scale.
It was built in 2023, making it 2 years old at the 2025 inventory.
It carries about 80 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 69 of the 213 inventoried bridges in Bonneville County rated good (32.4%); 3 (1.4%) 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 multiple box beam
Length	about 40 ft
Location	0.5 N 0.5 E Taylorville
NBI structure number	000000000031091
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 over Porter Canal	1966	38,000	Fair
US 20 Ebl & Wbl over Snake R.;johns Hole Br.	1966	38,000	Fair
US 20 over Sma 7096;RIVERSIDE Dr.ic	1969	38,000	Fair
US 20 over Sage Canal	1970	34,500	Fair
US 20 over UPRR	1966	32,000	Fair
US 20 Wbl & Ebl over Sma 7076;LINDSAY Blvd.ic	1966	32,000	Fair