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S 1 over Abandoned Railroad

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

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

S 1 over Abandoned Railroad in Granite 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 1966, making it 59 years old at the 2025 inventory.
It carries about 1,354 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 36 of the 73 inventoried bridges in Granite County rated fair (49.3%); 9 (12.3%) 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 165 ft
Location	Drummond
NBI structure number	P00019063+04351
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 Harvey Creek	1970	13,081	Good
I 90 over Drainage	1971	13,081	Good
I 90 over Sep Bearmouth Road	1970	13,081	Good
I 90 over Clark Fork River	1970	13,081	Poor
I 90 over Rattler Gulch	1971	13,081	Fair
I 90 over Clark Fork River	1970	11,802	Fair