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S 41 over Beaverhead River

Madison County, Montana · rated Fair in the 2025 National Bridge Inventory

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

S 41 over Beaverhead River in Madison County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1949, making it 76 years old at the 2025 inventory.
It carries about 2,403 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 57 of the 98 inventoried bridges in Madison County rated fair (58.2%); 7 (7.1%) 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	Steel stringer or multi-beam girder
Length	about 152 ft
Location	12M SW Twin Bridges
NBI structure number	P00049014+06711
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.

Bridge	Built	Vehicles/day	Condition
US 287 over O`dell Creek	2001	4,500	Fair
US 287 over Madison River Overflow	2001	4,500	Good
US 287 over Madison River Overflow	2001	4,500	Good
US 287 over Madison River Overflow	2001	4,500	Good
US 287 over Madison River	2001	4,500	Fair
US 287 over South Willow Creek	1934	4,102	Poor