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E Boulder Rd over Boulder River 030

Sweet Grass County, Montana · rated Good in the 2025 National Bridge Inventory

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

E Boulder Rd over Boulder River 030 in Sweet Grass County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2002, making it 23 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 30 of the 94 inventoried bridges in Sweet Grass County rated good (31.9%); 6 (6.4%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 118 ft
Location	2M S Mcleod
NBI structure number	L49116000+03001
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.

Bridge	Built	Vehicles/day	Condition
I 90 over Spring Creek	1980	12,306	Fair
I 90 over Work Creek	1972	10,845	Fair
I 90 over Upper Deer Creek	1980	6,153	Fair
I 90 over Upper Deer Creek	1980	6,153	Fair
I 90 over Lower Deer Creek	1980	6,153	Fair
I 90 over Lower Deer Creek	1980	6,153	Good