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S 1 over Silver Bow Creek

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

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

S 1 over Silver Bow Creek in Deer Lodge 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 1964, making it 61 years old at the 2025 inventory.
It carries about 4,640 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 38 of the 67 inventoried bridges in Deer Lodge County rated fair (56.7%); 3 (4.5%) 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 70 ft
Location	6M SW Warm Springs
NBI structure number	P00019000+05891
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 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