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Old Hwy 10 E over St Regis River 059

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

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

Old Hwy 10 E over St Regis River 059 in Mineral 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 1937 and reconstructed in 1986, making it 88 years old at the 2025 inventory.
It carries about 140 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 17 of the 153 inventoried bridges in Mineral County rated poor (11.1%); 17 (11.1%) 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	Continuous steel stringer or multi-beam girder
Length	about 194 ft
Location	St Regis
NBI structure number	L31179013+02001
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 Drainage	1986	8,111	Good
I 90 over Sep Local Road	1973	7,824	Fair
I 90 over Sep Local Road	1973	7,824	Fair
I 90 over Int Taft	1973	7,824	Fair
I 90 over Sep Randolph Creek Road	1973	7,824	Fair
I 90 over St. Regis River	1973	7,824	Fair