Due to the drought and unusually warm weather conditions, toxic blooms of cyanobacteria (blue-green algae) and other water-quality issues are occurring more frequently in the East Bay Regional Park District and elsewhere. We monitor our lakes and shorelines regularly and post warnings and closures when appropriate. Here’s a current update of which lakes and shorelines are affected:
The Park District encourages visitors who wish to enjoy water activities to visit these other popular lakes, beaches, lagoons, and pools: Castle Rock in Walnut Creek, Cull Canyon in Castro Valley, Contra Loma Lagoon in Antioch, Don Castro in Hayward, and Roberts Pool at Roberts Regional Recreation Area in Oakland.
Thank you for your patience and cooperation!