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US 12 over Sandstone Creek

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

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

US 12 over Sandstone Creek in Fallon 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1971, making it 54 years old at the 2025 inventory.
It carries about 498 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 19 of the 38 inventoried bridges in Fallon County rated fair (50.0%); 2 (5.3%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 142 ft
Location	2M W Plevna
NBI structure number	P00002067+09361
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Lake St over Baker Lake Overflow	2009	2,393	Good
S 7-main St N over Sandstone Creek	1941	2,209	Poor
US 12 over Drainage	1998	1,600	Fair
US 12 over Timber Creek	1998	825	Fair
US 12 over Sandstone Creek	1998	753	Fair
US 12 over RR	1968	696	Fair