Ada County Highway District

McMillan and Black Cat Intersection

The Ada County Highway District (ACHD) is designing a future roundabout for the McMillan and Black Cat intersection. The purpose of the project is to improve traffic flow and increase safety for all users.

Proposed Improvements

  • Construct a multi-lane roundabout at the McMillan and Black Cat 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 crossing
  • Add a truck apron for larger vehicles to use if necessary and intersection lighting

Learn More 

Please review the information at the links below.  While your comments are always welcome, the survey closed on June 9, 2022.

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Project Manager

Rachel Speer

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