MAG News

Drivers trying to cross under Interstate 17 during heavy rains may be all too familiar with the flooding that can occur on major roadways such as Greenway, Thunderbird, Cactus and Peoria. The good news is that help is on the way.

Fed Up With Flooding?
Prop 400 project coming to the rescue

Prop400

Drivers trying to cross under Interstate 17 during heavy rains may be all too familiar with the flooding that can occur on major roadways such as Greenway, Thunderbird, Cactus and Peoria. The good news is that help is on the way. A drainage project scheduled to begin construction this fall is expected to prevent such flooding in the future. The project is slated to take just under two years to complete.

The Maricopa Association of Governments (MAG) is responsible for long-range transportation planning in the region, and included the project in the Regional Transportation Plan approved under Proposition 400, the voter approved regional sales tax for transportation in Maricopa County.

“Flooding during heavy rainstorms is a well-known problem under I-17, and this project will improve both the safety and efficiency of a critical freeway corridor,” said MAG Chair Mark Mitchell, mayor of Tempe. “We appreciate that the foresight of voters allows us to continue to deliver transportation projects that make a difference in the daily lives of residents.”

The drainage project will replace four aging storm drain pump stations with a modern gravity-fed storm drain system. Pumping stations along I-17 at Greenway, Thunderbird, Cactus, and Peoria will be removed. As part of the new system, 30” to 90” diameter pipes will divert storm water to the Arizona Canal Diversion Channel (ACDC) near Dunlap Avenue. In addition, two water retention basins will be built at I-17 and Thunderbird. 

The project is anticipated to cost $38.4 million. Funding for the improvements will come from Proposition 400.

Published October 29, 2019

About MAG

The Maricopa Association of Governments (MAG) is a Council of Governments (COG) that serves as the regional planning agency for the metropolitan Phoenix area.

Title VI

Title VI requires that no person in the United States of America shall, on the grounds of race, color, or national origin, be excluded from the participation in, be denied the benefits of, or be otherwise subjected to discrimination under any program or activity for which MAG receives federal financial assistance.

Get in Touch

  • Address: 302 N. 1st Ave., Suite 300
    Phoenix, Arizona 85003

  • Phone: (602) 254-6300

  • FAX: (602) 254-6490

  • Email: mag@azmag.gov