Phoenix Metro Area Projects

Loop 202 South Mountain Freeway

Frequently Asked Questions

The FAQ below provides general information related to the Loop 202 South Mountain Freeway. For more detailed information, please refer to the Record of Decision or the Environmental Impact Statement documents. The Record of Decision also includes a more detailed FAQ section in Volume 1, section 9, Public Outreach and Comments Received on the Final EIS and Errata, and Record of Decision, Volume II, beginning on page A371.

What is the current status of the project and what are the next steps?

The Federal Highway Administration (FHWA) issued a Record of Decision (the final decision-making document for the project) selecting a build alternative on March 5, 2015.

ADOT is proceeding with right-of-way acquisition and the procurement of final design and construction services. Currently, ADOT is in the process of acquiring the properties needed for the project. As part of that process, ADOT is initiating demolition activity on acquired properties along the freeway alignment. The demolition activity will remove structures on residential and commercial properties that ADOT has acquired.

ADOT will be working very closely with the city of Phoenix on specific start times for demolition activity and traffic control, including the posting of work zone traffic barricades and safety flagmen as necessary. Neighborhood access points will remain open during demolition activities. Security personnel will monitor all acquired properties throughout the demolition phase of the project to deter any criminal activity.

How will the freeway be funded and built?

The freeway is funded by state, federal, and local dollars. ADOT has determined that pursuant to the unsolicited proposal submitted to construct the freeway, construction will follow a public-private partnership helping to speed construction and reduce overall cost of the project. The freeway would not be tolled under any public-private partnership proposal, but would include a private group involved with design, construction and maintenance of the 22-mile-long freeway.

Where will the freeway be located?

The freeway will run east and west along Pecos Road and then north and south between 55th and 63rd avenues, connecting with Interstate 10 on each end (see map).

When would the freeway be built?

Construction is planned to begin in 2016, with the freeway opening to traffic in late 2019 or early 2020. Funding to begin construction of the South Mountain Freeway is currently programmed and identified in the state’s Five-Year Transportation Facilities Construction Program.

Will the construction of the freeway require the acquisition of existing homes or businesses?

Although ADOT currently owns a substantial majority of the needed right of way along Pecos Road, approximately 400 total properties, including approximately 200 homes, will need to be acquired to construct the freeway. ADOT's property acquisition program includes working as early as possible with property owners and providing benefits to the extent allowed by law to cover actual, reasonable moving costs and related expenses. ADOT is required to pay market value for businesses and residential properties and will provide relocation assistance. Concerns about a specific property related to the South Mountain Freeway should be directed to [email protected] or 602.712.7006.

The city of Phoenix offers business retention and expansion services. For more information, please visit

What if I own property near the freeway?

Right-of-way maps are available here; please check those carefully. Determination of the final right-of-way to be acquired will be made during the design phase and will involve coordination with local and regional governments.

To prepare for construction, ADOT has been contacting property owners whose properties will be impacted by freeway construction and is beginning the process to acquire properties within the freeway corridor. ADOT anticipates issuing purchase offers to property owners beginning in April 2015.

ADOT's property acquisition program includes working as early as possible with property owners and providing benefits to the extent allowed by law to cover actual, reasonable moving costs and related expenses. ADOT is required to pay market value for businesses and residential properties and will also provide relocation assistance.

Concerns about a specific property related to the South Mountain Freeway should be directed to [email protected].

What are the procedures for demolition activity of acquired properties?

ADOT is currently in the early stages of demolition activity on acquired properties along the freeway alignment. The demolition activity will remove structures on acquired residential and commercial properties. ADOT will be working very closely with the City of Phoenix on specific start times for demolition activity, traffic control, including the posting of work zone traffic barricades and safety flagmen as necessary. Neighborhood access points will remain open during demolition activities. Security personnel will monitor all acquired properties throughout the demolition phase of the project to deter any criminal activity.

How will dust be controlled during the demolition of acquired properties and freeway construction?

During the demolition process each contractor is required to acquire a dust permit issued by the Maricopa Air Quality Department. During demolition the contractors are required to have a water truck on sight and to apply the water as specified by Air Quality regulations during the demolition phase. The demolition contractor will have an onsite superintendent to monitor dust mitigation compliance. Upon completion of the demolition the contractor will be required to apply gravel as a stabilization media. ADOT Property Management will enter this information into its dust database and will routinely monitor the property for any issues.

During the construction phase the construction contractor will utilize similar dust mitigation protocols outlined by the Maricopa Air Quality Department and will utilize water trucks during the construction phase and landscape the project in accordance with the contract agreement.

How was it decided to build this freeway?

The Loop 202 (South Mountain Freeway) has been a critical part of the Maricopa Association of Governments Regional Freeway Program since it was first included in funding approved by Maricopa County voters in 1985. The freeway was also part of the Regional Transportation Plan funding passed by Maricopa County voters in 2004 through Proposition 400. The freeway is a key component of the region’s adopted multimodal transportation plan and the Regional Freeway and Highway System and is the last piece to complete the Loop 202.

How was the route for the freeway decided?

The route for the freeway was determined through a multidisciplinary process to identify a range of reasonable alternatives that were studied in detail in the Environmental Impact Statement (EIS). The study process involved identifying, comparatively screening, and eliminating alternatives based on:

  • input from the public
  • a comparison of modal choices
  • a multidisciplinary set of criteria evenly applied
  • the historical context of the proposed action
  • projected conditions with and without the alternatives being considered
The final decision on the route for the freeway alignment was a cooperative effort involving ADOT, Federal Highway Administration (FHWA) and Maricopa Association of Governments (MAG). As a corridor that is part of a comprehensive regional plan developed by MAG, ADOT serves as the agency responsible for implementation of the plan, with FHWA providing the federal oversight required to access federal funds. FHWA is the lead federal agency responsible for implementing the requirements of the National Environmental Policy Act (NEPA), the governing federal law, and was responsible for the ultimate decision in selecting a route for the freeway.

Why isn’t it on Gila River Indian Community Land?

While efforts to study project alternatives on Community land were attempted, the Community has long held a position of not allowing the freeway to be located on its land. For example, a coordinated referendum of Community members to favor or oppose construction of the freeway on Community land or to support a no-build option occurred in February 2012, and Community members voted in favor of the no‑build option. Therefore, the freeway cannot be located on Community land.

Why not consider light rail or other transit instead of a freeway?

The study did consider a variety of transportation alternatives, modes, and strategies that would fit into the Regional Transportation Plan, including transit. The freeway option was determined to best meet the purpose and need for the project, following an extensive screening process which included evaluation of additional benefits such as system linkage, regional mobility, and consistency with regional and local long-range plans.

How was public input used?

Public input was a vital component in the decision-making process and was solicited from project inception and through key milestones in the Draft and Final Environmental Impact Statement (EIS) processes. The interests and needs of the public, along with all other social, economic, and environmental issues and impacts, were fully analyzed and included in the Draft and Final EIS. Comments made during development of the Draft EIS were used to adjust plans, explore new questions, or make changes—all within the scope of the National Environmental Policy Act (NEPA). Public comments received on the Draft EIS were reviewed and addressed in the Final EIS document. Public comments received on the Final EIS were also considered and addressed appropriately in the Record of Decision.

More information about the entire public involvement process up to publication of the Final EIS is available in Chapter 6, Comments and Coordination, of the Final EIS.

Will the new freeway generate new truck traffic?

One of the factors considered in the study was (1) the amount of truck traffic that would use the freeway and (2) its potential impact on the surrounding community. The MAG regional travel demand model forecasts approximately 10 percent truck traffic on the implemented South Mountain Freeway in 2035. The forecasted truck traffic is based on existing traffic studies and projected socioeconomic data. This percentage is similar to current traffic conditions on I-10 between Loop 101 and I-17 and on US 60.

Will this freeway serve as a truck bypass to relieve congestion from Downtown Phoenix?

The primary purpose of the freeway is not to create a "truck bypass" for downtown Phoenix. The freeway is part of a transportation system developed to improve mobility in the region by increasing capacity and providing traffic alternatives—including truck traffic—to other, already congested routes. Commercial trucks would use the proposed freeway. As with all other freeways in the MAG region, trucks would use it for the through‑transport of freight, for transport to and from distribution centers, and for transport to support local commerce. Like other “loop” freeways in the Phoenix metropolitan area, the South Mountain Freeway would be a commuter corridor, primarily serving automobiles and helping to move local traffic between the eastern and western portions of Maricopa County.

Will trucks carrying hazardous cargo be allowed to use the highway?

Arizona highways, like most highways across the United States, are open to all kinds of traffic, so long as the cargo being carried is in accordance with U.S. Department of Transportation regulations for the specific type of cargo. The Arizona Department of Transportation has a few locations in the state with hazardous cargo restrictions, but these restrictions are based on emergency response issues or roadway design limitations specific to that location. For example, the Interstate 10 Deck Park Tunnel has certain hazardous cargo transport restrictions because of the limited ability for emergency responders to address a hazardous materials incident in the tunnel. The South Mountain Freeway is expected to operate under the same rules as other similar facilities in the state; transport of hazardous cargo would be expected to be permissible.

Will the freeway be built wide enough so it doesn’t have to be torn up and rebuilt in a few years?

The South Mountain Freeway will be constructed as an eight-lane freeway (three general purpose lanes and one HOV lane in each direction). This change from the original 10-lane planning concept would still meet the transportation needs outlined in the proposed project’s purpose and need criteria. There are no current plans to widen the freeway in the future.

Will the freeway be built below existing ground?

The study team analyzed the below-ground option. In the western portion of the freeway, the option was determined to not be preferable because of the high water table near the Salt River and other physical features such as the Laveen Area Conveyance Channel, Roosevelt Irrigation District, and Union Pacific Railroad, that are not feasible for the freeway to pass under. In the eastern portion of the freeway, due to storm water flowing south off of the South Mountains, a below-ground option would not eliminate the need for mitigation for noise-related impacts and would also require:

  • an additional $400 million for construction and right-of-way
  • displacement of an additional 300 residences
  • maintenance of additional pump stations and detention basins for the life of the freeway

Because the below-ground option would result in substantially greater costs and residential displacements, this option was eliminated from further study.

Where will the interchanges be located?

Traffic interchange locations will be approximately 1‑mile intervals, at major street crossings, listed below.
Van Buren Street
Buckeye Road
Lower Buckeye Road
Broadway Road
Southern Avenue
Baseline Road
Dobbins Road
Elliot Road
51st Avenue
17th Avenue
Desert Foothills Parkway
24th Street
40th Street

It is anticipated that most of the interchanges will be elevated, with the freeway’s mainline elevated over arterial cross streets.

Will anything be built through South Mountain Park/Preserve?

Federal restrictions prohibit intrusion of a federal project such as the proposed freeway into a park like South Mountain Park/Preserve, unless it can be shown that there is no feasible and prudent alternative to avoid such an intrusion. As documented in the Environmental Impact Statement, no feasible and prudent alternative(s) could be identified to avoid impacts on the park. Approximately one mile of the freeway will pass through the southwestern edge of the park. The amount of land in the park that will be affected by the freeway is 31.3 acres, which is less than 0.2 percent of the entire park.

Will storm water runoff be controlled? Where will the water go?

The freeway will be designed to control storm water runoff and prevent flooding. The rates of discharge would not be greater than existing rates of discharge. Runoff from the completed freeway will be directed to existing and new drainage facilities. Existing drainage facilities with inadequate capacity will be improved to handle increased runoff flows. New runoff detention facilities might be required in some locations to limit the maximum rate of runoff released to existing drainage facilities.

In the western portion of the freeway alignment, drainage facilities ultimately discharge to the Salt River. In the eastern portion, existing drainage patterns from the South Mountains toward the Gila River would not be altered. Currently, drainage flows generally from the north to the south, passing under Pecos Road through a series of culverts following natural drainages/washes. Small drainage basins and channels on the northern side of the freeway to treat water quality and to meter and direct drainage flows under the freeway and onto the Gila River Indian Community land will function in the same manner as they are currently. ADOT has committed to continue coordination with the Gila River Indian Community on design of the drainage infrastructure through final design as well as other issues through the project development process.

Will there be access to the Gila River Indian Community from the traffic interchanges in the Eastern Section?

Federal law requires providing access to the proposed freeway from the Community. Traffic interchanges will provide the Gila River Indian Community access to the freeway. Connection from the Community to the service traffic interchanges bordered by Community land would be the responsibility of the Community, in coordination with appropriate jurisdictions.

How many vehicles will use the freeway?

Approximately 117,000 to 190,000 vehicles daily would use the South Mountain Freeway in 2035.

What impact will the freeway have on air quality?

Air quality impacts were estimated through sophisticated computer modeling based on predictions of the amount and nature of traffic under worst-case scenarios. The emissions models are based on extensive emissions testing that the U.S. Environmental Protection Agency (EPA) has conducted on thousands of vehicles representative of the ages and models of the vehicle fleet on the roads today

The carbon monoxide and particulate matter (PM10) analyses demonstrated that the freeway will not contribute to any new localized violations, increase the frequency or severity of any existing violation, or delay timely attainment of the National Ambient Air Quality Standards or any required interim emissions reductions or other milestones.

Since ozone is a regional pollutant, there is no requirement to analyze potential impacts and no possibility of localized violations of ozone to occur at the project level. The Maricopa Association of Governments is responsible for developing plans to reduce emissions of ozone precursors in the Maricopa area. The South Mountain Freeway is included in the Regional Transportation Plan that has been determined by the U.S. Department of Transportation to conform to the State Implementation Plan on February 12, 2014.

The emission modeling developed for the  freeway showed that for the mobile source air toxics study area, there would be little difference in total annual emissions of mobile source air toxics emissions (less than a 1 percent difference) in 2025 and 2035. In addition, beginning in 2017, the new EPA Tier 3 vehicle and fuel standards will reduce tailpipe and evaporative emissions and reduce mobile source air toxics.

The Record of Decision discusses the air quality analyses in greater detail.