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I 90 over Int Warm Springs

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

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

I 90 over Int Warm Springs in Deer Lodge 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 1978, making it 47 years old at the 2025 inventory.
It carries about 5,209 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 26 of the 67 inventoried bridges in Deer Lodge County rated good (38.8%); 3 (4.5%) 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 225 ft
Location	Warm Springs
NBI structure number	I00090201+05492
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I 90 over Lost Creek	1978	11,628	Fair
I 90 over Willow Creek	1978	10,417	Fair
I 90 over Int Galen	1978	5,814	Fair
I 90 over Int Galen	1978	5,814	Good
I 90 over Sep Perkins Lane	1978	5,814	Fair
I 90 over Sep Huffman Lane	1978	5,814	Fair