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 
    No Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the lake. All toxins detected have been below California state advisory levels. 
  • Lake Anza (Tilden) 
    Caution 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 
    Danger Advisory Posted:  
    Cyanobacteria (blue-green algae) is present and toxins have been detected at the shoreline.
  • Lake Del Valle 
    Caution Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the reservoir, 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.
  • Shadow Cliffs 
    No Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the lake. All toxins detected have been below California state advisory levels. 
  • Shadow Cliffs Arroyo Access Area
    Caution Advisory Posted: Cyanobacteria (blue-green algae) is present in the Arroyo Area and toxins have been detected recently. Avoid contact with the water and keep dogs away from the Arroyo Area.  
  • Contra Loma 
    No Advisory Posted: 
    Cyanobacteria (blue-green algae) is present in the lake, but all toxins detected have been below California state advisory levels recentlyAs a precaution, 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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