The ambitious job of building bridges and other infrastructure continues along the Northwest Extension Phase II project. The extension give riders new options for riding the light rail farther into north Phoenix. 

The project includes extending light rail westward along Dunlap Avenue from 19th Avenue, then north along 25th Avenue, and across I-17 at Mountain View Road. 

Light rail will end at a new above-ground station at the site of the former Metrocenter Mall. 

Two companies, Kiewit and McCarthy Building Companies, are working on the extension.  

Bridge and infrastructure work continues on the Northwest Extension
Arizona Canal bridge construction for light rail

Two bridges designed to carry light rail are under construction.  

One bridge extends over the Arizona Canal. According to building project manager Tony Santana, the canal bridge is nearly complete. Santana said the next steps include laying down tracks over the bridge.  

Santana said the contractor continues work on the I-17 bridge with the construction of piers on the west side of I-17. Early next year, the contractor plans to set steel girders over I-17, some 250-feet over the freeway. That will mark the first elevated section on the Valley Metro system.  

Valley Metro Community Outreach Coordinator Michael Book said up to two-weekend closures would be necessary to install the bridge girders over I-17.  

Bridge and infrastructure work continues on the Northwest Extension
Bridge and station work at Metrocenter

When completed in 2024, the Northwest Extension Phase II will include three new stations, including the interchange at Metrocenter. 


Bridge and infrastructure work continues on the Northwest Extension
Elevated station construction at Metrocenter

Want to know what’s happening with light rail construction? Keep up to date with the Valley Metro mobile app called Construct VM.  It can be downloaded on iOS or Android devices. More on the Northwest Extension can be found at (

Mark Carlson
Mark Carlson
Rail Operations Communications Specialist
Mark Carlson is an Operations Communications Specialist with Valley Metro. He brings 40 years of newsroom experience to his position including working as a newsroom supervisor for 23 years with The Associated Press in Washington, D.C., and Phoenix. In addition to serving as a writer, editor, anchor, and reporter for radio stations in Phoenix and Los Angeles, he also worked as a television assignment editor and digital news writer and editor in Phoenix and Baltimore. A Phoenix native, Mark attended Maryvale High.