The purpose of this project is to prepare all the necessary final design documentation to fully reconstruct the Ina Road traffic interchange in accordance with the previous I-10, Ina Road TI to Ruthrauff Road TI Project documentation. I-10 currently passes over Ina Road, and with this project, Ina Road will become elevated and pass over I-10, Union Pacific Railroad and Camino De Oeste. The existing frontage roads and ramps will require reconstruction to intersect with the crossroad in its reconstructed (elevated) position.
Since the mid-1980s, ADOT has recognized the need to reconstruct the mainline lanes of I-10 to provide greater capacity, efficient operational levels of service and increased vertical clearances at crossroads. The 1993 ADOT I-10 General Plan outlined the necessary improvements along I-10, which included two-lane, one-way frontage roads along each side as well as necessary crossroad widening at the frontage road intersections. The 1993 General Plan did not include a railroad grade separation at Ina Road. In 2006, Pima County voters approved a countywide sales tax to fund a 20-year program of transportation improvements to be administered by the RTA. One of the RTA projects is to eliminate the existing at-grade railroad crossings of the Union Pacific Railroad tracks at Ina Road. The proposed improvements shown for I-10 meet the long-range planning objectives of ADOT, the town of Marana, Pima County, Pima Association of Governments and the RTA, and improve the capacity, public safety and operational characteristics of the Ina Road TI. This project will also remain sensitive to environmental concerns and cultural resources.