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- Horseshoe Lake and Rainbow Lake 
    No Advisories Posted: 
    Cy
    anobacteria (blue-green algae) is present in Horseshoe Lake and the swim beach, but all toxins detected have been below California state advisory levels. 
    Lago Las Osos (in Quarry Lakes) – Caution Advisory Posted
  •  Alameda Creek Trail - Shinn Pond
    Caution Advisory Posted: 
    There is a cyanobacteria bloom with a CAUTION designation at Shinn Pond. There is no body contact allowed at Shinn Pond. Keep dogs away from the water. 
  • Lake Anza (Tilden) 
    Danger Advisory Posted
    Cyanobacteria (blue-green algae) is present in the lake, and low level toxins have been detected recently. Avoid any contact with cyanobacteria or scums in the water, and keep dogs away from the lake. 
  • Lake Temescal 
    No Advisory Posted:  Cyanobacteria (blue-green algae) is present in the lake. All toxins detected have been below California state advisory levels.
  • Lake Chabot 
    Caution Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the lake, and toxins have been detected recently. Avoid any contact with the water and keep dogs away from the lake. Swimming is never permitted at Lake Chabot.
     
  • Big Break 
    Caution Advisory Posted: 
    Cyanobacteria (blue-green algae) is present and toxins have been detected at the shoreline.
  • Lake Del Valle 
    No Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the reservoir. All toxins detected have been below California state advisory levels.
  • Shadow Cliffs 
    No Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the lake. All toxins detected have been below California state advisory levels.   
  • Contra Loma 
    Caution Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the lake, and toxins are present, and low level toxins have been detected recently. Avoid any contact with cyanobacteria or scums in the water, and keep dogs away from the water. Swimming is only allowed in the pool.

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