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US 2 over Irrigation-stockpass

Blaine County, Montana · rated Poor in the 2025 National Bridge Inventory

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

US 2 over Irrigation-stockpass in Blaine County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1940, making it 85 years old at the 2025 inventory.
It carries about 2,335 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 10 of the 102 inventoried bridges in Blaine County rated poor (9.8%); 10 (9.8%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 152 ft
Location	1M E Chinook
NBI structure number	P00001405+06071
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 2 over Main Irrigation Canal	1968	3,311	Good
Irr - US 2 over Milk River	1964	3,311	Poor
US 2 over Red Rock Creek Overflow	1942	2,919	Fair
US 2 over Drainage	1942	2,919	Fair
US 2 over Red Rock West Overflow	2020	2,732	Good
US 2 over Red Rock Coulee	2020	2,732	Good