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US 93 over Big Lost River

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

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

US 93 over Big Lost River in Butte County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1962, making it 63 years old at the 2025 inventory.
It carries about 2,600 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 22 of the 32 inventoried bridges in Butte County rated fair (68.8%); 1 (3.1%) 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 63 ft
Location	0.9 S. Moore
NBI structure number	000000000017965
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 Inl Central Connector	1993	4,400	Fair
US 20 over Big Lost River	1977	2,700	Good
US 93 over Arco Canal	1962	2,600	Good
US 93 over Spring Creek	1962	2,600	Good
US 93 over Big Lost River	1958	2,300	Fair
Stc 6749;2500N over Big Lost River	1926	500	Fair