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I 90 over Grant Creek

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

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

I 90 over Grant Creek in Missoula County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1965 and reconstructed in 1990, making it 60 years old at the 2025 inventory.
It carries about 27,328 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 66 of the 206 inventoried bridges in Missoula County rated good (32.0%); 15 (7.3%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	7	Good condition

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

Bridge	Built	Vehicles/day	Condition
N Reserve St over Clark Fork R Flood Plain	1977	35,914	Fair
N Reserve St over Clark Fork River	1975	35,914	Fair
Reserve St over W Broadway St-rr	1998	29,572	Fair
Brooks St-us 12 over Bitterroot River	1968	28,185	Fair
N Russel Street over Clark Fork River	2020	23,274	Good
S Orange St over Pedestrian-bike Path	2002	22,608	Good