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Knighton LN;3350 N over Big Lost River

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

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

Knighton LN;3350 N over Big Lost River in Butte 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 8 (very good condition) on the 0-9 scale.
It was built in 2010, making it 15 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 9 of the 32 inventoried bridges in Butte County rated good (28.1%); 1 (3.1%) 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 stringer or multi-beam girder
Length	about 126 ft
Location	2.3 N 0.5 E Moore
NBI structure number	000000000031486
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 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	1962	2,600	Fair
US 93 over Big Lost River	1958	2,300	Fair