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Irr Bia Rte 501 over Main Canal

La Paz County, Arizona · rated Fair in the 2025 National Bridge Inventory

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

Irr Bia Rte 501 over Main Canal in La Paz County, Arizona, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1988, making it 37 years old at the 2025 inventory.
It carries about 150 vehicles a day (traffic count year 2024).
It is one of 104 of the 306 inventoried bridges in La Paz County rated fair (34.0%); 10 (3.3%) 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 Arizona department of transportation.

Bridge	Built	Vehicles/day	Condition
I 10 EB and WB over Colorado River	1960	60,000	Good
SR 95 over Silver Creek	1978	32,600	Fair
I 10; EB & WB over Wash	1949	27,198	Good
I 10; EB & WB over Wash	1949	27,198	Fair
I 10; EB & WB over Italian Wash	1953	25,941	Good
I 10; WB over Wash	1969	25,941	Good