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Irr Bia Rte 60 over Main Drain

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

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

Irr Bia Rte 60 over Main Drain in La Paz County, Arizona, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1955, making it 70 years old at the 2025 inventory.
It carries about 10 vehicles a day (traffic count year 2021).
It is one of 10 of the 306 inventoried bridges in La Paz County rated poor (3.3%); 10 (3.3%) 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	Concrete stringer or multi-beam girder
Length	about 78 ft
Location	1.6 Km West of Bia 1
NBI structure number	00000000000H036
Condition class	Poor

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