Home › Montana › Park County › Main Boulder Rd over Four Mile Creek 039

Main Boulder Rd over Four Mile Creek 039

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

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

Main Boulder Rd over Four Mile Creek 039 in Park 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 1938, making it 87 years old at the 2025 inventory.
It carries about 157 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 86 of the 126 inventoried bridges in Park County rated fair (68.3%); 13 (10.3%) 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 30 ft
Location	30M S Springdale
NBI structure number	L34210000+03001
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 Int West Livingston	1962	9,461	Fair
I 90 over Int West Livingston	1962	9,461	Fair
I 90 over Int S Livingston-us Hwy	1962	9,461	Fair
I 90 over Quinn Creek Road	2022	8,272	Good
I 90 over Quinn Creek Road	2022	8,272	Good
I 90 over Int Hopper	1978	8,236	Fair