Home › Montana › Granite County › Frontage Road 153 over Clark Fork River

Frontage Road 153 over Clark Fork River 034

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

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

Frontage Road 153 over Clark Fork River 034 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 deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 272 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 169 ft
Location	14M W Drummond
NBI structure number	L20153000+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 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