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US 12 over Missouri River

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

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

US 12 over Missouri River in Broadwater 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 1935 and reconstructed in 1986, making it 90 years old at the 2025 inventory.
It carries about 6,843 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 23 of the 37 inventoried bridges in Broadwater County rated fair (62.2%); 4 (10.8%) 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	Continuous steel stringer or multi-beam girder
Length	about 500 ft
Location	1M N Townsend
NBI structure number	P00008076+03431
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US287 over Beaver Creek	1992	6,930	Fair
US 287 over Mud Spring Gulch	2013	6,444	Good
US 287 over Int Three Forks I 90	2012	6,444	Fair
US 287 over Deep Creek	2012	5,485	Fair
US 287 over Six Mile Creek	2020	5,250	Good
US 287 over RR	2020	5,250	Good