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I 90 over Int W Garrison-rr

Powell County, Montana · rated Poor in the 2025 National Bridge Inventory

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

I 90 over Int W Garrison-rr in Powell County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1979, making it 46 years old at the 2025 inventory.
It carries about 5,232 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 7 of the 113 inventoried bridges in Powell County rated poor (6.2%); 7 (6.2%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 709 ft
Location	Garrison
NBI structure number	I00090174+03631
Condition class	Poor

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