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S 12TH Rd over Huntley Main Canal 156

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

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

S 12TH Rd over Huntley Main Canal 156 in Yellowstone 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 1976 and reconstructed in 1993, making it 49 years old at the 2025 inventory.
It carries about 9 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 186 of the 290 inventoried bridges in Yellowstone County rated fair (64.1%); 7 (2.4%) 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 41 ft
Location	6M NE Huntley
NBI structure number	L56053011+01001
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I90 over MT Power RR Spur	2023	29,488	Good
I 90 over City County Drain Ditch	1966	27,985	Fair
King Ave W over Bbwa Canal	1994	26,602	Fair
Mullowney Ln over RR	2007	23,980	Good
Mullowney Ln over RR	2007	23,980	Fair
US 87 over Int Lockwood I 90	1966	23,199	Fair