Interstate 10 and State Route 210 Study

The Arizona Department of Transportation (ADOT), in conjunction with the Federal Highway Administration (FHWA), has begun Phase 2 of a study to determine how best to improve mobility along Interstate 10 between the intersection with Interstate 19 (I-19) and Kolb Road, southeast of downtown Tucson. Another major component of the study is to identify a new alignment of State Route 210 (SR 210) (Barraza Aviation Highway) that would connect the existing corridor with I-10, east of downtown.

Improving this section of I-10 would help alleviate traffic congestion in downtown Tucson, which is a major goal for ADOT, the city of Tucson, Pima County and the Pima Association of Governments.

Beginning in 2011, Phase 1 of the long-range planning process for these corridors included a Feasibility Study and Environmental Overview. The Feasibility Study, which was completed in 2015, examined future transportation needs and potential improvements, and the Environmental Overview identified potential environmental issues in the study area. Based on the Feasibility Study, two build alternatives and one "no-build" (nothing changes) alternative are being studied in Phase 2.

Phase 2 of the study was initiated in 2016 and includes a Design Concept Report (DCR) and an Environmental Assessment (EA) regarding potential improvements to I-10 from the I-10/I-19 interchange to Kolb Road and SR210 from Golf Links Road to a future connection with I-10 along Alvernon Way.

Both build alternatives under consideration involve expanding the number of I-10 travel lanes between Alvernon Way and Kolb Road. One of the options looks at the possibility of turning that segment of I-10 into a “collector-distributor” highway, which would feature local traffic lanes with direct access to traffic interchanges and express lanes for through traffic that bypass some ramps.


Design Concept Report

The DCR will further refine the two build alternatives identified in the Feasibility Study. The purpose of the proposed alternatives is to relieve congestion and improve traffic flow on I-10, and to connect SR210 with I-10 to provide an additional route into and out of the downtown Tucson area. The proposed alternatives were developed based on public and agency input received during Phase 1 as well as the technical analysis of multiple connection points between SR210 and I-10.

The following two proposed alternatives, plus a No-Build alternative, are being carried forward for more detailed analysis and study:

In both alternatives, Alvernon Way from the connection with Golf Links to I-10 would be designated as the extension of SR 210 and would include construction of a traffic interchange at I-10.

System Alternative I

  • Designate Alvernon Way as SR 210 from Golf Links Road to the I-10
  • Add a new system interchange to provide access from SR210 to I-10
  • Add up to two (2) lanes in each direction on I-10 from the I-10/I-19 interchange to Alvernon Way
  • Add up to four (4) lanes in each direction on I-10 from Alvernon Way to Kolb Road

System Alternative IV

  • Designate Alvernon Way as SR 210 from Golf Links Road to the I-10
  • Add a new system interchange to provide access from SR 210 to I-10
  • Add up to two (2) lanes in each direction on I-10 from the I-10/I-19 interchange to Alvernon Way
  • Modify I-10 from Alvernon Way to Kolb Road to serve as a collector-distributor roadway, adding up to four (4) lanes in each direction

No-Build Alternative

  • Do nothing

Both proposed system alternatives will add or improve interchanges, widen or replace existing bridges, and remove some existing interchange ramps to improve spacing and traffic flow on I-10. If the No-Build alternative is chosen, no action will be taken.

Environmental Assessment

The purpose of the EA is to identify any potential significant environmental impacts of the proposed build alternatives, including a No Build alternative. The EA will evaluate potential social, economic, and natural environmental impacts on multiple environmental resource categories such as air quality, water quality, biological resources, land use, noise and neighborhood and community impacts. Ultimately, the EA will determine if this project will result in a Finding of No Significant Impact or not. The EA is being prepared in accordance with the National Environmental Policy Act (NEPA) of 1969.

Ultimately, the EA will describe the project’s purpose and need, evaluate the two alternatives that are being considered, and analyze the environmental impacts of both alternatives.  All agency coordination and public involvement will also be documented in the EA.

Study Process

The next step is to review public comments on the build alternatives and adjust the alternatives, if necessary. An Initial DCR and Draft EA will then be prepared with an anticipated completion date of spring 2019. Community outreach is ongoing, so the public will continue to have an opportunity to provide input as the study progresses. Later, a public hearing will be held during the 30-day review period of the Draft EA to receive comments on the recommended alternative.  Subsequently, both the DCR and EA will be finalized and the selected alternative will be identified.

The study team will work with agency partners, stakeholders and the public to evaluate the two alternatives, as well as the merits of a No-Build alternative.

For more information about the study or to submit comments, please call the ADOT Project Information Line at 888.692.2678 or email [email protected].