Cyanobacteria (Blue-Green Algae) Updates

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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:

  • Quarry Lakes : Until further notice the swim beach is CLOSED due to cyanobacteria (blue-green algae).
  • Lake Temescal: There is currently a Caution Advisory for Lake Temescal. Cyanobacteria (blue-green algae) is present in the lake, but no toxins have been detected.  Swimming is permitted. Dogs are not allowed in Lake Temescal. Please keep dogs away from the water. 
  • Lake Anza: There is currently a Caution Advisory for Lake Anza. Cyanobacteria (blue-green algae) is present in the lake, but no toxins have been detected.  Swimming is permitted, but due to the risks for dogs and the frequency dogs around Lake Anza. Keep dogs away from the water.
  • Lake Chabot: Cyanobacteria (blue-green algae) is present in the lake. Avoid any contact with the water and keep dogs away from the lake. Swimming is never permitted at Lake Chabot.
  • Big Break: Cyanobacteria (blue-green algae) is present at Big Break. Avoid contact with the water and keep dogs away from the water. Swimming is never permitted at Big Break.

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.

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