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Irr Bia Rte 15 over Window Valley Wash

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

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

Irr Bia Rte 15 over Window Valley Wash in Pima County, Arizona, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1965, making it 60 years old at the 2025 inventory.
It carries about 1,100 vehicles a day (traffic count year 2023).
It is one of 361 of the 1,154 inventoried bridges in Pima County rated fair (31.3%); 11 (1.0%) 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 Arizona department of transportation.

Bridge	Built	Vehicles/day	Condition
Ramp to I-10 NW over I 10 Mainline	2003	281,068	Fair
I-10 EB & WB over Cushing Street	2009	209,279	Good
I-10 EB & WB over 18th Street	2009	209,269	Good
I-10 EB & WB over Congress Street	2009	195,388	Good
I-10 over St. Marys Rd	2009	195,068	Fair
I-10 over Speedway Blvd.	2009	195,068	Good