Downtown State St. & 9th St. Reconstruction Projects

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The Ada County Highway District (ACHD) will be constructing improvements to two downtown streets in the future: State St. between 16th St. and 2nd St. and 9th St. between State St. and Bannock St.

The purpose of the projects is to replace the aging roadway, increase safety and comfort for those that use State Street and 9th Street, and add green stormwater treatment facilities.

Project Description

State Street, 8th Street to 4th Street

  • Reconstruct roadway
  • Replace pedestrian ramps
  • Traffic signal work
  • Add bioretention curb extensions
  • Project expected to start construction as early as fall 2023

State Street, 14th Street to 8th Street

  • Segment is returning to the concept phase
  • May have significant design changes- project expected to start construction as early as 2025
  • Learn more on the project page.

9th Street, State Street to Bannock Street

  • Reconstruct roadway
  • Replace pedestrian ramps
  • Traffic signal work
  • Add bioretention curb extensions
  • The 9th and Bannock intersection will be completed with another project
  • No design changes - project expected to start construction as early as 2025

The Ada County Highway District (ACHD) will be constructing improvements to two downtown streets in the future: State St. between 16th St. and 2nd St. and 9th St. between State St. and Bannock St.

The purpose of the projects is to replace the aging roadway, increase safety and comfort for those that use State Street and 9th Street, and add green stormwater treatment facilities.

Project Description

State Street, 8th Street to 4th Street

  • Reconstruct roadway
  • Replace pedestrian ramps
  • Traffic signal work
  • Add bioretention curb extensions
  • Project expected to start construction as early as fall 2023

State Street, 14th Street to 8th Street

  • Segment is returning to the concept phase
  • May have significant design changes- project expected to start construction as early as 2025
  • Learn more on the project page.

9th Street, State Street to Bannock Street

  • Reconstruct roadway
  • Replace pedestrian ramps
  • Traffic signal work
  • Add bioretention curb extensions
  • The 9th and Bannock intersection will be completed with another project
  • No design changes - project expected to start construction as early as 2025

  • State Street, 14th Street to 8th Street

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    State Street, 14th Street to 8th Street

    • Segment is returning to the concept phase
    • May have significant design changes- project expected to start construction as early as 2025

    Learn more on the project page.

  • Project Updates

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    A few project changes have been made since ACHD last reached out to the public. Please see below for each segment.


    State Street & 16th Street

    • Reconstruct intersection
    • Replace pedestrian ramps
    • Traffic signal work
    • Add bioretention curb extensions
    • No design changes- project expected to start construction as early as late July 2023


    State Street, east of 4th Street to 2nd Street

    • Reconstruct roadway
    • Replace pedestrian ramps
    • Add bioretention curb extensions
    • Include dual-enhanced pedestrian crossings with bicycle push buttons at 3rd Street
    • No design changes- project expected to start construction as early as late July 2023


    State Street, 8th Street to 4th Street

    • Reconstruct roadway
    • Replace pedestrian ramps
    • Traffic signal work
    • Add bioretention curb extensions
    • No design changes - project expected to start construction as early as fall 2023


    State Street, 14th Street to 8th Street

    • Segment is returning to the concept phase
    • May have significant design changes- project expected to start construction as early as 2025


    9th Street, State Street to Bannock Street

    • Reconstruct roadway
    • Replace pedestrian ramps
    • Traffic signal work
    • Add bioretention curb extensions
    • No design changes - project expected to start construction as early as 2025

  • Design Updates

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    A few project elements have changed since ACHD shared the project with the public in 2022.


    State and 14th Street

    • The 'Z' style pedestrian crossing originally proposed has been changed to a more standard crossing with a refuge island and will still feature an overhead Rectangular Rapid Flashing Beacon (RRFB).


    State and 3rd Street

    • Based on public input, ACHD will add an enhanced pedestrian crossings with Rectangular Rapid Flashing Beacons (RRFB), including bicycle push buttons, to cross State Street.


    9th Street and Jefferson Street

    • One bulb-out was removed on the south side of 9th Street.
Page last updated: 06 Sep 2023, 08:20 AM