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US 30 over Perrine Coulee Canal

Twin Falls County, Idaho · rated Fair in the 2025 National Bridge Inventory

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

US 30 over Perrine Coulee Canal in Twin Falls County, Idaho, 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 1960, making it 65 years old at the 2025 inventory.
It carries about 15,500 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 107 of the 126 inventoried bridges in Twin Falls County rated fair (84.9%); 5 (4.0%) 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 Idaho department of transportation.

Bridge	Built	Vehicles/day	Condition
US 93 over Perrine Coulee;bike Path	2006	33,000	Fair
US 93 over Snake River; Perrine Br.	1976	31,500	Fair
SH 74 over Rock Creek	1993	19,000	Good
US 93 over Rock Creek	2011	15,000	Fair
STC7232;BLUE Lakes over Rock Creek	1959	11,500	Poor
US 30 over US 30/US 93 Interchange	1997	11,000	Fair