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Old Hwy 87 over Two Leggins Canal 0

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

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

Old Hwy 87 over Two Leggins Canal 0 in Big Horn 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 1931, making it 94 years old at the 2025 inventory.
It carries about 564 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 5 of the 133 inventoried bridges in Big Horn County rated poor (3.8%); 5 (3.8%) 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

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

Bridge	Built	Vehicles/day	Condition
I 90 over Irrigation Canal	1971	8,516	Fair
Irr-s 47 over Int W Hardin I 90	1970	5,396	Fair
Irr - I 90 over Int Dunmore	1959	4,473	Fair
Irr - I 90 over Int Dunmore	1959	4,473	Fair
Irr - I 90 over Bighorn River	1971	4,258	Good
Irr - I 90 over Bighorn River	1971	4,258	Fair