Project Profile: SR 24 - Gateway Freeway: SR 202L to Ellsworth Road

Firm name: Stanley Consultants

Project building name and location: SR 24 - Gateway Freeway: SR 202L to Ellsworth Road, Maricopa County, Ariz.

Type of building and type of project: Reserve Center, New Constuction

Project completion date and project duration: Fall 2013

Engineering challenges and solutions:


Project construction documents are currently 95 percent complete with Final P, S & E to be completed and submitted to the Arizona Department of Transportation by the end of September 2011. Bid advertisement is anticipated at the end of October 2011. Start of construction is anticipated in March 2012. The construction duration is 19 months – from spring 2012 to fall 2013.

Project Description:

The SR 24, Williams Gateway Freeway is a high profile proj­ect with the goal of providing direct freeway access between SR 202L and Ellsworth Road. Located in Maricopa County, Arizona, the $120 million project consists of design and construction of a new urban freeway with a four-level directional urban traffic interchange (TI) on one end and an urban compact diamond TI on the other. In addition, the SR 24 will serve as an important link in providing regional connectivity with existing (SR202L, US60 and SR79) and planned regional (North-South Corridor) facilities in both Maricopa and northern Pinal County.

The need for a high-capacity access-controlled facility became increasing clear as a result of projected population growth for this area, coupled with specific development patterns in and around the Phoenix-Mesa Gateway (PMG) Airport. The Mesa Gateway area is a 32 square-mile area that encompasses the PMG Airport, former General Motors (GM) Proving Grounds, and the proposed SR 24 within the City of Mesa.

Stanley Consultants was retained by the Arizona Department of Transportation to provide final design of the project. Major features include:

  • Three miles of freeway widening on SR 202L including widening of an existing post-tensioned box Girder Bridge.
  • One mile of new freeway on SR 24 from SR 202L to Ellsworth Road, including two new multi-span precast AASHTO girder bridges over a flood control channel and an arterial street.
  • Four new freeway to freeway TI ramps, which include two multi-span bridges over the existing SR 202L freeway and two multi span bridges over existing arterial streets. The new directional ramp structures are cast-in-place post-tensioned box girder bridges.
  • Two new service TI ramps connecting SR 24 to Ellsworth Road.
  • Major and minor arterial street reconstruction.
  • Relocation of existing power, communication, natural gas, water and sewer facilities.
  • Complex construction phasing with detours and extensive traffic control.
  • Extensive coordination with the DOT, FAA, utilities and local agencies.



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