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I 90 over Clark Fork River

Powell 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 Powell County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1961 and reconstructed in 1992, making it 64 years old at the 2025 inventory.
It carries about 5,354 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 70 of the 113 inventoried bridges in Powell County rated fair (61.9%); 7 (6.2%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 152 ft
Location	1.2M S Deer Lodge
NBI structure number	I00090187+06892
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I 90 over Dempsey Creek	1973	10,708	Fair
I 90 over Jr Grade Sep	1961	10,463	Fair
I 90 over Jr Grade Sep	1961	10,463	Fair
I 90 over Int Jens	1959	5,992	Fair
I 90 over Int Jens	1959	5,992	Fair
I 90 EB over Int Gold Creek	1959	5,992	Fair