ConstructionEquipmentGuide.com had a detailed article about the Ina Interchange project. The story gave a through overview of the project.
Arizona Department of Transportation (ADOT) is improving traffic flow on Interstate-10 in Marana, Ariz., by constructing a new interchange bridge over I-10 and the Union Pacific Railroad Tracks at Ina Road. Besides providing better traffic movement, the $128 million project will improve safety at the location. Ina Road was closed in February 2017 and the project is on track to complete work in early 2019.
Funding for the work is provided by the Federal Highway Administration, Pima Association of Governments and the Regional Transportation Authority. Marana also contributed $7.9 million toward the cost of new bridges being built over the Santa Cruz River.
Ina Road will be widened to Silverbell Road west of I-10. An additional lane will be added, giving the highway four lanes in each direction. The project also will turn an aging intersection into a modern interchange. One of the major changes will be a new bridge to carry Ina Road traffic over I-10 and the railroad tracks.
The original bridge, which has been demolished, carried I-10 motorists over Ina Road. Crews have been working to rebuild a four-lane Ina Road west of the freeway. They dug holes for pillars to support the new bridge. A milestone was met at the end of January 2018 when westbound traffic was moved to the new eastbound pavement. That allowed for three lanes in both directions until the project is complete.
It also meant that the bridge and new westbound pavement could be completed.
“The new Ina Road bridge over I-10 is complete over the eastbound lanes,” said Tom Herrmann, public information officer of ADOT in Phoenix. “And with all traffic now on that pavement, we'll complete the bridge over the westbound lanes and the Union Pacific Railroad tracks.”
Once completed, motorists using Ina Road will enjoy smoother traffic flow without regular interruptions for trains passing through. Originally, it was two lanes in each direction on the east side of I-10 and a single lane in each west of I-10. The project will result in two lanes in each direction to Silverbell Road in the west. Ina Road will have two bridges, one eastbound and one westbound, each with two travel lanes.
About a half mile to the west, crews have been working on a two-lane bridge on eastbound Ina Road where it crosses the Santa Cruz River. In an early February update, Herrmann reported that the eastbound Ina Road bridge had been completed. In addition to bridges, the project includes new ramps.
“Because we are replacing the two I-10 bridges with a single Ina Road bridge, we are building an entirely new interchange, including on and offramps,” Herrmann said.