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US 12 over South Fork Smith River

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

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

US 12 over South Fork Smith River in Meagher 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 1997, making it 28 years old at the 2025 inventory.
It carries about 1,023 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 36 of the 53 inventoried bridges in Meagher County rated fair (67.9%); 7 (13.2%) 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 72 ft
Location	8M S White Sulphur Spr
NBI structure number	P00014033+05541
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 89 Fh 32 over North Fork Smith River	1955	607	Fair
Main St over North Fork Smith River	1962	575	Fair
US 12 over N Fork Musselshell R	2014	508	Fair
US 12 over Four Mile Creek	1937	486	Fair
US 89 Fh 32 over Sheep Creek	1939	376	Fair
US 12 over Flagstaff Creek	2012	347	Fair