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US 87 over Beaver Creek

Fergus County, Montana · rated Good in the 2025 National Bridge Inventory

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

US 87 over Beaver Creek in Fergus County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2009, making it 16 years old at the 2025 inventory.
It carries about 2,589 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 52 of the 158 inventoried bridges in Fergus County rated good (32.9%); 9 (5.7%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 128 ft
Location	7M SW Lewistown
NBI structure number	P00057074+01391
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 87-e Main St over Mill Ditch	1922	8,747	Fair
US 87-w Main St over Big Spring Creek	1962	5,357	Fair
US 191-1st Ave N over Big Spring Creek	1960	5,189	Fair
US 87 over Boyd Creek	1942	2,831	Fair
US 191-kendall Rd over Big Spring Creek	1976	2,663	Fair
US 87 over Cottonwood Creek	2009	2,589	Fair