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S 323 over Little Missouri River

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

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

S 323 over Little Missouri River in Carter 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 1983, making it 42 years old at the 2025 inventory.
It carries about 216 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 27 of the 42 inventoried bridges in Carter County rated fair (64.3%); 2 (4.8%) 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 142 ft
Location	15M NE Alzada
NBI structure number	S00323056+05001
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 212 over Drainage	1965	2,642	Fair
US 212 over Thompson Creek	1965	2,642	Fair
US 212 over Little Missouri River	1965	2,642	Fair
US 212 over Willow Creek	1955	2,285	Fair
Chicago AVE over Russell Creek	2019	480	Good
Mormon Ave over Russell Creek 035	1940	480	Fair