Oakland’s Lake Temescal has been closed to swimming due to yet another outbreak of toxic algae. The California Department of Public Health says exposure to the blue-green algae can cause diarrhea, skin irritation, headaches, vomiting, and sometimes death.
Cyanobacteria, or blue-green algae, forms naturally in surface water. The photosynthetic bacteria clusters multiply quickly in slow-moving, warm and nutrient-rich water. Carolyn Jones, a park district spokesperson, says that the algae, which had not been a problem until 2014, is likely related to drought conditions. This is the third year in a row that the lake has been closed, after an 80-year history with no problems.
Jones said it could take weeks, or even months, for the algae to clear up in the popular lake. The East Bay Regional Park District website cautions people to also keep dogs away from the water of Lake Temescal.
Several other Oakland area lakes are being affected by toxic blue-green algae blooms. The Arroyo behind Shadow Cliffs and Lake Del Valle contain the bacteria, but in low enough levels that swimming is still allowed. Swimming is prohibited at Lake Chabot and Shinn Pond.
Jones said that officials are acting on the cautious side at the popular lake.
Photo credit: Hal MacLean, East Bay Regional Park District