District Notice

Toxic Blue-Green Algae: Updates

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Due to the drought and unusually warm weather conditions, toxic blooms of 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:

  • Big Break: Blue-green algae toxins are present in the water. Keep dogs away from the water. Boating, kayaking, and fishing are still permitted. Swimming is never permitted at Big Break.

  • Lake Anza is open to swimming. Blue-green algae is present in the lake, but toxins are not currently detected. Keep dogs away from the lake.

  • Lake Chabot: Toxic blue-green algae is present in the water. Avoid any contact with the water and keep dogs away from the lake. Swimming is never permitted at Lake Chabot.

  • Shadow Cliffs Arroyo: Blue-green algae is present in the Arroyo. Keep dogs away from the water in the Arroyo. 
  • Quarry Lakes is open to swimming. Blue-green algae is present in the lake, but toxins are not currently detected. Keep dogs away from the lake. 

The Park District encourages visitors who wish to enjoy water activities to visit these other popular lakes, beaches, lagoons and pools: Cull Canyon in Castro Valley, Contra Loma Lagoon in Antioch, Don Castro in Hayward, and Roberts Pool at Roberts Regional Recreation Area in Oakland.

More information: Cyanobacteria Blue-Green Algae [PDF]

More information: District Swim Facilities

More information: Toxic Blue-Green Algae. Check back for updates.

More Information: Water Resources

Thank you for your patience and cooperation.

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