Lake Hazel and Maple Grove Roundabout

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This project is substantially complete. 

The Ada County Highway District (ACHD) is designing a future roundabout for the Lake Hazel & Maple Grove intersection. The purpose of the project is to improve traffic flow and increase safety for all users.

Project Description

  • Construct a multi-lane roundabout at the Lake Hazel and Maple Grove intersection
  • Add curb, gutter, and a detached 10-foot wide multi-use pathway
  • Construct crosswalks at each leg of the intersection with two-stage pedestrian crossings
  • Install rectangular rapid flashing beacons (RRFBs) at each pedestrian crosswalk
  • Add a truck apron for larger vehicles to use if necessary

The Ada County Highway District (ACHD) is designing a future roundabout for the Lake Hazel & Maple Grove intersection. The purpose of the project is to improve traffic flow and increase safety for all users.

Project Description

  • Construct a multi-lane roundabout at the Lake Hazel and Maple Grove intersection
  • Add curb, gutter, and a detached 10-foot wide multi-use pathway
  • Construct crosswalks at each leg of the intersection with two-stage pedestrian crossings
  • Install rectangular rapid flashing beacons (RRFBs) at each pedestrian crosswalk
  • Add a truck apron for larger vehicles to use if necessary

This project is substantially complete. 

  • December 1, 2023

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    • Road closure started November 13th.
    • Existing signals have been removed.
    • Roadway milling complete November 16th.
    • Grade prep started.
    • Idaho Power work nearly complete. Waiting on parts.
    • Electrical underground work started.
    • Fiber utility work ongoing.
    • Water line install has started.
    • Speed bump install around the project for TTC is scheduled for November 29th.

  • November 22, 2023

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    • Road closure started November 13th.
    • Existing signals have been removed.
    • Roadway milling complete November 16th.
    • Grade prep started.
    • Idaho Power work nearly complete - waiting on a part.
    • Electrical underground work started.
    • Fiber utility work ongoing.
    • Water line install is schedule to start middle of December.
    • Speed bump install around the project for TTC is scheduled for early next week.

  • November 17, 2023

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    ► Road closure started November 13th .

    ► Existing signals have been removed.

    ► Roadway milling started November 16th .

    ► Idaho Power work complete.

    ► Electrical work started.

    ► Fiber utility work started.

  • November 9, 2023

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    • Temporary signal installation will activate Sunday night at the corners of Cole and Desert and Maple Grove and Desert in preparation for the full intersection closure at Lake Hazel and Maple Grove starting November 13th.

  • November 3, 2023

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    • Temporary signal installation has started on the corners of Cole and Desert and Maple Grove and Desert in preparation for the full intersection closure at Lake Hazel and Maple Grove.
    • Detour Map for the Lake Hazel Roundabout Project

  • October 27, 2023

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    Temporary signal installation has started on the corners of Cole and Desert/Maple Grove and Desert in preparation for the full intersection closure at Lake Hazel and Maple Grove.

  • Construction to start October 2023

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    The Ada County Highway District will start construction on the Lake Hazel Road and Maple Grove Road roundabout project in October 2023.* Construction is anticipated to be complete summer 2024.

    Construction Impacts

    • Temporary road closures
    • Lane restrictions with flaggers
    • General construction noise, dust, equipment backup alarms and ground vibration
    • Crews will work from 7 a.m. to 7 p.m. unless otherwise approved
    • The contractor will work with property owners to minimize construction impacts


    *Due to high demand for contractors, labor and supplies, the construction schedule may change.

  • Fall 2021 Public Outreach

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    Find responses to the frequently asked questions received this summer and additional information at the links below. While your comments are always welcome, the comment period closed on October 12, 2021.