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S Boulder Rd over Lwr S Boulder River 066

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

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

S Boulder Rd over Lwr S Boulder River 066 in Madison County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2003, making it 22 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2025).
Its listed owner is the county highway agency.
It is one of 34 of the 98 inventoried bridges in Madison County rated good (34.7%); 7 (7.1%) 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 tee beam
Length	about 46 ft
Location	5M S Jefferson Island
NBI structure number	L29062002+05001
Condition class	Good

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