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Toxic Algae Update

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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:

  • Lake Temescal is open to swimming. Blue-green algae is present, but no toxins detected. Keep dogs away from the lake.
  • Quarry Lakes is open to swimming. Blue-green algae is present, but no toxins detected. Keep dogs away from the lake.
  • Del Valle: Blue-green algae is present in Del Valle Reservoir, but no toxins detected. Keep dogs away from the lake.
  • Lake Chabot: Toxic blue-green algae is present and swimming is never permitted. Avoid any contact with the water and keep dogs away from the lake.
  • Shadow Cliffs Arroyo: Blue-green algae is present in the Shadow Cliffs Arroyo, but no toxins have been 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 on all District Swim Facilities

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

Thank you for your patience and cooperation.

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