Home › Idaho › Butte County › W Antelope;fr 137 over Antelope Creek

W Antelope;fr 137 over Antelope Creek

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

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

W Antelope;fr 137 over Antelope Creek 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 deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1966, making it 59 years old at the 2025 inventory.
It carries about 10 vehicles a day (traffic count year 2023).
Its listed owner is the county 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	Timber stringer or multi-beam girder
Length	about 29 ft
Location	20.8 W. 0.5 S. Arco
NBI structure number	000000000031548
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	1962	2,600	Fair
US 93 over Big Lost River	1958	2,300	Fair