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Irr County Road 20 over Smoke Creek 016

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

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

Irr County Road 20 over Smoke Creek 016 in Roosevelt County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1955, making it 70 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 36 of the 57 inventoried bridges in Roosevelt County rated fair (63.2%); 7 (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

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

Bridge	Built	Vehicles/day	Condition
Irr - US 2 over Mosquito Creek	1986	4,269	Fair
Irr - US 2 over Little Wolf Creek	1988	4,269	Fair
Irr - US 2 over Poplar River	2000	2,296	Fair
S 16 over Sheep Creek	1970	2,129	Fair
Irr - US 2 over Tule Creek	1958	2,054	Fair
Irr - US 2 over Chelsea Creek	1960	2,054	Poor