• Increase font size
  • Decrease font size
  • Print
  • RSS
  • Sunset Road: I-10 to River Road

    site map
    Click image above for the interactive map

    Project Cost: 34,944,752

    Project Length: Approximately 0.7 miles
    Project Status: Design Phase
    Design Schedule: Design Concept Report approved March 2021; Final Design through March 2022; Construction Start January 2023
    Engineering Consultant: CONSOR Company & Kimley Horn

    The Pima County Department of Transportation (PCDOT), in association with the Regional Transportation Authority (RTA), and in coordination with the Arizona Department of Transportation and the City of Tucson, is designing a roadway extension to connect Sunset Road from I-10 to River Road. The project is part of the 2006 voter-approved RTA 20-year multimodal plan. The project scope consists of roadway and bridge improvements necessary to connect Sunset Road from I-10 to River Road. 

    The Sunset I-10 to River project has been combined with the ADOT’s I-10 Reconstruction between Ruthrauff and Ina Roads project. This provides economy of scale for bidding, and combines all of the construction activity in the area into a single project, allowing for better planning in terms of alternate routes. The project has been bid at this time, and ADOT is working to have a contract in place and ready to start construction in January.


    You can sign up for updates on the project directly from ADOT, who will be overseeing construction for this project, on their website. Scroll down towards the bottom of the page at the link below, and subscribe under the “Stay Informed” section.

    To find out more about these projects, you can find the websites here:

    ADOT’s Ruthrauff to Ina: https://azdot.gov/projects/southcentral-district-projects/i-10-reconstruction-between-ruthrauff-and-ina-roads

    PCDOT’s Sunset I-10 to River Road: https://webcms.pima.gov/cms/One.aspx?pageId=533587

    Why the improvements are necessary (Purpose and Need)

    • The purpose of the project is to improve mobility in the vicinity of the I-10 Sunset Road traffic interchange by connecting Sunset Road from I-10 to River Road.
    • Capacity improvements provided by the project are needed in order to accommodate future travel demand volumes in a safe and efficient manner.


    • The Draft Environmental Assessment (DEA) and Design Concept Report (DCR) was approved in March 2021 by the Board of Supervisors.
    • Final Design started March 2021, and will be completed in March 2022.
    • The Draft Environmental Assessment (DEA) was available for public review from March 28 through April 26, 2022.
    • Final Environmental Assessment (FEA)/Finding of No Significant Impact (FONSI) completed May 2, 2022
    • Construction timeline is estimated to start January 2023. The construction timeframe is anticipated to be between 18-24 months.

    Interactive Map

    I-10 Reconstruction between Ruthrauff and Ina roads - ADOT (azdot.gov) 

    Contact Information

    Community Relations

    Carol Brichta
    Program Manager
    Department of Transportation
    (520) 724-6442
    email: Carol Brichta

    Project Planning

    Stephen Wilson
    Civil Engineering Manager
    Department of Transportation
    (520) 724-5912
    email: Stephen Wilson

    Final Design

    Nancy Cole
    Director Capital Program Office
    Department of Transportation
    (520) 724-6312
    email: Nancy Cole

    Scoping and Environmental Documents


    • Final Design Concept Report (DCR) and supporting documents
    • Public Notice: Notice of Draft Environmental Assessment Available for Public Review and Opportunity for a Public Hearing - evite

    Meeting Notices

    Open House - March 31, 2020   - Cancelled

    Floodplain Mapping

    A Conditional Letter of Map Revision (CLOMR) application has been submitted to the Federal Emergency Management Agency (FEMA) to reflect changes to the Rillito Creek floodplain associated with the proposed Sunset Road Bridge over the Rillito Creek that will connect River Road to Interstate 10. The project will modify the Flood Insurance Rate Maps (FIRMs) for Pima County and the City of Tucson. The FIRM panels impacted are 04019C1660 L, 04019C1666 L and 04019C1667 L. 

    The regulatory floodplains on the FIRMs are designated as Special Flood Hazard Areas (SFHAs), which are areas that have 1-percent chance of being inundated in any given year. The FIRM maps also show a floodway, which is the portion of the floodplain that must be reserved for the regulatory flow. FIRMs are used to determine if flood insurance is required for federally backed mortgages. The FIRM maps are also to help assist communities with floodplain management.

    Each of the three maps linked on this webpage show three floodplains. The imagery on the maps are as follows:

    • The areas highlighted in LIGHT and DARK BLUE represent the Special Flood Hazard Areas (SFHAs), which are areas that would be inundated with water from a flood event that has a 1% probability of occurring in any given year. 
    • The BLUE areas covered with FINE RED DOTS reflect the floodway.  
    • The areas in GREEN represent areas that would be inundated with water from a flood event that has 0.2% probability of occurring in any given year.
    • The BLUE NUMBERS represent the Base Flood Elevations in feet above sea level.

    The first image on each page reflects the current or Existing FIRM mapping. 

    Sunset Rd to I-10 Map

    Map 1 of 3
    Map 2 of 3
    Map 3 of 3

    It is important to note that watercourses and watersheds change overtime and, since 2011, floodplain modeling and mapping standards have changed. This has led to the creation of the corrective effective conditions floodplain model. 

    The center image reflects the Corrective Effective Conditions and illustrates what the floodplain would look like if it were remapped today without the proposed bridge. The pre-bridge analysis indicates that the Rillito Creek could breakout to the north at the Camino de La Tierra Road alignment (LIGHT BLUE area). There are four privately owned properties where the floodplain limits extend slightly past the property lines under the current conditions; no homes are impacted. The majority of the breakout flow would impact publicly owned land and rights-of-way. There is an additional breakout in a drainage channel further north where the flow is contained within the channel.

    The image on the right reflects the Proposed Conditions, which represents the floodplain changes to the Rillito Creek with the proposed Sunset Road Bridge. When you compare the water surface elevations from the Corrective Effective Conditions to those on the Proposed Conditions, you will see the maximum increase in the regulatory base flood elevation is about one foot just upstream of the proposed bridge. The image also shows an increased width of the floodway by approximately 180 feet, 600 feet downstream of the proposed bridge. The final floodway will be contained within the soil cement bank protection. 

    There are two structures adversely impacted by the increased water surface elevation by the proposed bridge. Those are two greenhouses owned by Pima County that will be removed or relocated.  There are no other structures impacted by increased water surface elevations under the proposed conditions. 

    Once the project is completed, a Letter of Map Revision (LOMR) request will be submitted to FEMA to revise the water surface elevations and FIRM SFHAs and the floodway.  Please see the attached brochure for the most frequently asked questions about LOMRs. 

    If you have any questions regarding the FEMA mapping process for this project, contact the Pima County Regional Flood Control District at (520) 724-4600 or email the District at RFCD@Pima.Gov.


    Sunset Map 1 Sunset Map 2 Sunset Map 3
    Follow UsShare this page

    Kathryn Skinner, P.E.

    201 N. Stone Ave., 4th Fl.
    Tucson, AZ 85701

    Phone: (520) 724-6410
    Fax: (520) 724-6439

    Department Home Page
    Department News
    Department Directory
    Boards, Commissions and Committees
    Report a problem
    Public Works Quick Guide
    Volunteer with Pima County