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Marshall Creek Rd over Flint Creek

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

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

Marshall Creek Rd over Flint Creek 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1956, making it 69 years old at the 2025 inventory.
It carries about 352 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	Timber stringer or multi-beam girder
Length	about 38 ft
Location	1M W Philipsburg
NBI structure number	S00348000+04001
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