This popular Castro Valley swimming spot is only a short drive north from Interstate 580 on Cull Canyon Road in Castro Valley.

When the swim area was constructed, a secondary dam was built to provide an inner swimming area complete with sandy beach. Never previously tried, this innovation made the swim area water level independent of the reservoir's, unaffected by summer draw-downs.

The lagoon won the 1966 Governor's Design Award for Exceptional Distinction for Recreational Development in the category of landscape.

Park Activities

The swim complex is open during swim season with lifeguard service. For current hours of operation and lifeguard service schedule, visit the Swim Facilities page.

The swim complex includes a bathhouse, vending machines, and the 1.5-acre swim lagoon. It is ideal for families with small children who will enjoy splashing in the shallows and playing on the white sandy beach. Inside the swim complex there are three additional reservable picnic areas. (Beach access fee to enter swim area.)