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I 94 over Sep Frontage-old Hwy 10

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

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

I 94 over Sep Frontage-old Hwy 10 in Rosebud 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 2,636 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 87 of the 112 inventoried bridges in Rosebud County rated fair (77.7%); 7 (6.2%) 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 124 ft
Location	3M W Hathaway
NBI structure number	I00094114+02372
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Irr Bia Rte 6 over Lame Deer Creek	1976	3,000	Good
I 94 over Int East Forsyth	1977	2,749	Fair
I 94 over Int East Forsyth	1977	2,749	Fair
I 94 over Int W Rosebud 446-447	1970	2,636	Fair
I 94 over Int W Rosebud 446-447	1970	2,636	Fair
I 94 over Rosebud Creek	1970	2,636	Fair