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Twin Peaks Rd. over I-10

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

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

Twin Peaks Rd. over I-10 in Pima County, Arizona, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2010, making it 15 years old at the 2025 inventory.
It carries about 20,666 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 782 of the 1,154 inventoried bridges in Pima County rated good (67.8%); 11 (1.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 217 ft
Location	10.3 mi NW Jct SR 77
NBI structure number	02890
Condition class	Good

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