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US 12 over Twin Coulee

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

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

US 12 over Twin Coulee in Golden Valley County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1935, making it 90 years old at the 2025 inventory.
It carries about 448 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 10 of the 17 inventoried bridges in Golden Valley County rated fair (58.8%); 0 (0.0%) 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	Timber stringer or multi-beam girder
Length	about 56 ft
Location	1M E Lavina
NBI structure number	P00014147+04581
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
S 3 over Big Coulee Creek	1959	2,161	Good
S 3 over Musselshell River	1959	2,161	Fair
US 12 over Careless Creek	1988	2,040	Good
US 12 over Nine Mile Creek	1990	2,040	Fair
S 3 over Painted Robe Creek	1993	1,940	Good
US 12 over Twin Coulee	1935	448	Fair