S 1 over RR

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

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

S 1 over RR 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 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 26 of the 67 inventoried bridges in Deer Lodge County rated good (38.8%); 3 (4.5%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
It was rated fair in the 2024 inventory and is now good (deck 6 to 7).
Its most recent inspection on record is dated June 2024, on a 24-month routine inspection cycle.
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

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Deck	6	7	Good condition
Superstructure	7	7	Good condition
Substructure	7	7	Good condition


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 150 ft
Location	6M S Warm Springs
NBI structure number	P00019000+03001
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	June 2024
Inspection interval (item 91)	24 months
Scour (item 113)	N: not over a waterway

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