I-17: Central Avenue Bridge Construction Project

The Arizona Department of Transportation, in association with the Maricopa Association of Governments (MAG), and in coordination with the city of Phoenix and Valley Metro, is replacing the Interstate 17 bridge over Central Avenue located south of downtown Phoenix. The bridge was identified for replacement in the MAG Interstate 10/Interstate 17 Corridor Master Plan (also known as the “Spine Study”) to support the future widening of I-17 in Maricopa County.

Project Area Map

map of I-17 central ave bridge project

Why is this project necessary?

ADOT is removing and replacing the bridge for two primary reasons:

  • Bridge Age:  The bridge was constructed in 1962 and is nearing the end of its useful service life.
  • Bridge Height:  The existing vertical clearance of 13 feet, 11 inches over Central Avenue does not meet current design standards, prohibiting high-profile vehicles from using Central Avenue beneath the bridge, and cannot accommodate Valley Metro’s future South Central Light Rail Extension.

Construction Timeline

  • Work is scheduled from April 2020 through fall 2021.
  • Schedules are subject to change because of weather and other unforeseen conditions.

About the Project

  • Key elements of this project include widening the bridge to accommodate the addition of a future 12-foot-wide auxiliary lane on the northbound and southbound sides of I-17 and increasing the vertical clearance over Central Avenue to 16 feet. This will enable high-profile vehicles and Valley Metro light rail trains to travel beneath it.
  • Bridge removal and replacement will start on southbound I-17. When the southbound side is complete, work will be shifted to northbound I-17.

Project Rendering

I-17 Central Rendering

What to Expect During Construction

  • I-17 will be narrowed to two lanes in each direction at Central Avenue while construction is underway.
  • Crews are scheduled to work daytime hours, Mondays through Fridays, adjacent to I-17.  Drivers need to slow down and use caution around construction personnel and equipment.
  • Additional work is scheduled to occur weeknights between 9 p.m. and 5 a.m. and on weekends.
  • No work will be scheduled on holidays.
  • I-17 and Central Avenue will be restricted or closed at times. Drivers should allow extra travel time and plan to use detours.
    • Detour for I-17 drivers:  Use east or westbound Interstate 10 between the I-10/I-17 “Stack” interchange and the I-17 “split” at 24th Street.
    • Detour for Central Avenue drivers: Use Seventh Street or Seventh Avenue.
  • ADOT will provide information about restrictions and closures in advance so drivers can plan to use alternate routes and allow extra time.

Check out photos from the work zone on ADOT's Flickr page.

Stay Informed!

ADOT welcomes your questions and comments. Please contact us in any of these ways:

  • By email: Subscribe to receive project updates and traffic alerts.
  • By phone:  Call the ADOT Bilingual Project Information Line at 855.712.8530.
  • Online: Submit a question or comment through the ADOT website. Visit azdot.gov/Contact and then select Projects from the dropdown menu.
  • By mail:  Write to ADOT Community Relations, 1655 W. Jackson St., MD 126F, Phoenix, AZ 85007
  • Twitter:  Follow ADOT on Twitter  (@Arizona DOT) for real-time highway conditions statewide.