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Mile Square Regional Park Expansion

Lake surrounded by green grass with a woman sitting on a bench

Master Plan Implementation - Phase 2

September 2024: Phase 2 construction begins. Click here for more information. 
December 2023: Orange County Board of Supervisors approves design-build contract. 

Master Plan Implementation - Phase 1

November 2023: Phase I complete and open to the public. 
March 2022: Construction of Phase 1 of the Master Plan.

Final Master Plan and EIR

The Master Plan for Mile Square Regional Park includes the plan and design of the 93-acre expansion to the regional park and was approved by the Board of Supervisors in July 2021. The work included research, design, public presentation, master planning, environmental review, and construction. Click on this link to view the details of the four phases of the completed planning and design process.

Draft Master Plan and Notice of Availability of Draft EIR

Members of the public are invited to comment on the Draft Master Plan and Draft Environmental Impact Report (EIR) for the Mile Square Regional Park Expansion.  A recorded presentation is available to view and the documents are available to download below. The project site is not on a list enumerated under Section 65962.5 of the California Government Code. This project has no significant and unavoidable environmental effects.

Public Review and Comment Period: Thursday, April 8, 2021 – Monday, May 24, 2021

Submit comments to:

  • Email address: milesquareexpansion@ocparks.com
  • Mailing address: OC Parks/Planning & Design Division, 13042 Old Myford Road, Irvine, CA 92602
  • Voicemail: 714-973-6865

Notice of Preparation of a Draft EIR and Public Scoping Meeting

The County has filed a Notice of Preparation to prepare a Draft Environmental Impact Report (EIR) for the Miles Square Regional Park Master Plan.

Scoping Meeting – September 10, 2020

The County will host a virtual/online public scoping meeting to be held as noted below to provide an update to the project and to solicit comments relative to the content of the information to be analyzed in the Draft Environmental Impact Report (Draft EIR).

Date: September 10, 2020     

Time: 6 p.m.

Public input regarding the appropriate topics for analysis to be included within the EIR is being sought. The comment period is August 24, 2020 to September 22, 2020. You may provide your comments through email at milesquareexpansion@ocparks.com, or by submitting them in writing to OC Parks/Planning & Design Division, 13042 Old Myford Road, Irvine, CA 92602. Oral comments will also be accepted on the project hotline at 855-697-3702.

Open House August 15, 2019

The second public engagement event was held in conjunction with the OC Parks Summer Concert Series. The County of Orange, OC Parks presented design options for public feedback on the 93-acre expansion to the regional park. Over 150 people attended the Open House visiting interactive stations to review proposed park improvements.

Postcard Invitation

Date: Thursday, August 15, 2019

Time: Open House from 4 - 7 p.m.; Concert begins at 6 p.m.

Location: Freedom Hall, Mile Square Regional Park

For more information, please email milesquareexpansion@ocparks.com, or call (714) 973-6865.

Community Meeting January 16, 2019

Postcard Invitation


Date: Wednesday, January 16, 2019

Time: 6:30 pm – 8:30 pm

Location: Freedom Hall, Mile Square Regional Park

For more information, please email milesquareexpansion@ocparks.com, or call (714) 973-6865.