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I 15 Sbl over Stc 6731;W 145 N Ic

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

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

I 15 Sbl over Stc 6731;W 145 N Ic in Bonneville 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 5 (fair condition) on the 0-9 scale.
It was built in 1962, making it 63 years old at the 2025 inventory.
It carries about 3,200 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 141 of the 213 inventoried bridges in Bonneville County rated fair (66.2%); 3 (1.4%) 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	Concrete stringer or multi-beam girder
Length	about 107 ft
Location	7.0 S. Roberts
NBI structure number	000000000011805
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 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