Contra Loma Regional Park, Regional park in Antioch, California.

Contra Loma Regional Park is a regional park in Antioch featuring a reservoir surrounded by hiking trails and open spaces for outdoor recreation. The area provides multiple access points around the water body with paths suitable for different activity levels.

The U.S. Bureau of Reclamation is updating its long-term plan for Contra Loma Regional Park and the adjacent Antioch Community Park; the previous plan was written in 1975, before a population boom hit eastern Contra Costa County. The reservoir is owned by the Contra Costa Water District. The park is part of the East Bay Regional Parks system.

The reservoir is owned by the Contra Costa Water District, and fishing there requires a Daily Fishing Access Permit plus an access fee. Anglers catch catfish, black and striped bass, bluegill, trout and redear sunfish. A lifeguarded swim lagoon opens in summer, and alcoholic drinks are banned throughout the park.

A permit is required for fishing activities, and the reservoir holds several fish species for anglers to pursue. Early mornings or late afternoons offer the most comfortable visiting conditions, especially during warmer months.

The reservoir functions as both a recreational destination and a critical water management infrastructure for the surrounding area. Visitors often overlook how their leisure activities coexist with the operational needs of regional water systems.