Home › Arizona › Pima County › Twin Peak Rd. over UPRR

Twin Peak Rd. over UPRR

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

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

Twin Peak Rd. over UPRR 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	Continuous prestressed concrete multiple box beam
Length	about 228 ft
Location	10.3 mi NW Jct SR 77
NBI structure number	02891
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