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US 87 over Musselshell River

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

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

US 87 over Musselshell River in Musselshell 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 1996, making it 29 years old at the 2025 inventory.
It carries about 2,799 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 16 of the 28 inventoried bridges in Musselshell County rated good (57.1%); 1 (3.6%) 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 274 ft
Location	Roundup
NBI structure number	P00016047+05501
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 over Park Coulee	1995	2,548	Good
US 87 over Razor Creek	1995	2,548	Good
US 87 over South Willow Creek	1976	1,223	Good
US 12 over Willow Creek	1999	712	Fair
US 12 over Drainage	2003	480	Good
US 12 over Dean Creek	1935	441	Fair