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Big Creek Rd over St Regis River 019

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

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

Big Creek Rd over St Regis River 019 in Mineral County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1972, making it 53 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2025).
Its listed owner is the county highway agency.
It is one of 99 of the 153 inventoried bridges in Mineral County rated fair (64.7%); 17 (11.1%) 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 124 ft
Location	Haugan
NBI structure number	L31054000+01001
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 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