Quarry Lakes Regional Recreation Area

Once the site of gravel mining operations, the quarries have long since been flooded and used for groundwater recharging. Horsehoe Lake and Rainbow Lake are open to picnicking, swimming, and non-motorized watercraft, while Willow Slough and Lago Los Osos are reserved for wildlife habitat.

519 acres
Open Access
Alameda County
Managed By: East Bay Regional Park District

East Bay Regional Park District's page for this park.

Quarry Lakes Regional Recreation Area: Once the site of gravel mining operations, the quarries have long since been flooded and used for groundwater recharging. Horsehoe Lake and Rainbow Lake are open to picnicking, swimming, and non-motorized watercraft, while Willow Slough and Lago Los Osos are reserved for wildlife habitat.; East Bay Regional Park District's page for this park.; 37.572317337 -121.999277191