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I 90 over Clark Fork River

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

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

I 90 over Clark Fork River in Missoula County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1979, making it 46 years old at the 2025 inventory.
It carries about 4,584 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 125 of the 206 inventoried bridges in Missoula County rated fair (60.7%); 15 (7.3%) 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	Continuous steel stringer or multi-beam girder
Length	about 1,019 ft
Location	5M E Alberton
NBI structure number	I00090080+03411
Condition class	Fair

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
I 90 over Grant Creek	1965	27,328	Good
N Russel Street over Clark Fork River	2020	23,274	Good