Mile Square Regional Park is an urban park located in the City of Fountain Valley and totals 607 acres of land. Within the park's boundaries are three regulation golf courses, three soccer fields, three baseball and three softball diamonds, an archery range and a nature area. Also, there are two fishing lakes, concession operated bike and paddle boat operations, a wide expanse of picnic areas as well as numerous picnic shelters. Shelters serve a wide variety of visitors ranging from individuals to families and group organizations to annual company picnics.
65 acres of land located adjacent to Brookhurst is leased to the City of Fountain Valley for recreational purposes. This parcel has been developed by the city into a high-activity community park. Facilities provided by the city include a community center building, ball diamonds, basketball courts, outdoor play areas and a tennis court complex. Night lighting is provided on much of the outdoor facilities to extend playing hours.
Activities
Soccer, baseball, softball, cross country track meets, fishing and archery tournaments are among a few of the activities taking place at Mile Square. These activities provide a variety of recreational opportunities to meet most visitor interests. 62 acres, leased to the City of Fountain Valley, have been intensively developed by the City.
An executive 18-hole golf course, complete with a driving range, coffee shop with bar, and banquet room encompasses Mile Square's northwest border and a regulation 18-hole golf course, Complete with a driving range, club house, restaurant and proshop encompass Mile Square's southwest border.
Fall trout stocking was delayed due to a disruption in the supply chain.
In early 2020, multiple California trout hatcheries were infected with Lactococcus garvieae, a bacterial outbreak similar to streptococcus. California Department of Fish and Wildlife (CADFW) was forced to euthanize millions of trout, which will impact inland fishing for many years.
OC Parks has been working with our lake management contractor to secure necessary permits and import Rainbow Trout from a hatchery located in Idaho. The first trout stockings are anticipated to take place the week of Dec. 7-11. The full stocking schedule will be posted as soon as it is finalized.
UPDATED 4/19/21: In an effort to minimize the impacts of coronavirus (COVID-19) on park patrons, staff, and the Orange County community at large, and consistent with the guidance provided by the Centers for Disease Control and Prevention (CDC), Governor’s office, the Orange County Board of Supervisors and the Orange County Health Care Agency (HCA), OC Parks are operating in the following manner.
OC Public Works will complete a routine rehabilitation project within the Ocean View Flood Control Channel in the Cities of Fountain Valley and Huntington Beach beginning Mid June 2019.
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Soccer, baseball, softball, cross country track meets, fishing and archery tournaments are among a few of the activities taking place at Mile Square. These activities provide a variety of recreational opportunities to meet most visitor interests. 62 acres, leased to the City of Fountain Valley, have been intensively developed by the City. 
