Toxic Algae Bloom Closes Lake Del Valle In Livermore

LIVERMORE (CBS SF) -- A toxic algae bloom has led to the closure of a popular lake in the East Bay, authorities said.

Lake Del Valle in Livermore is closed to swimming because of the algae, the East Bay Regional Park District said Tuesday.

People and dogs were urged to stay out of the water until further notice.

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The park district said staff detected the blue-green algae (cyanobacteria) Monday afternoon near the boat launch. Preliminary tests showed a toxicity of more than 20 parts per billion, exceeding the park district's threshold.

According to the California Regional Water Quality control Board, dogs exposed to blue-green algae toxins can develop lethargy, difficulty breathing, vomiting, diarrhea, muscle rigidity or convulsions. Exposure to dogs could be fatal.

In humans, the algae toxins can cause eye irritation, allergic skin rash, mouth ulcers, vomiting, diarrhea, and cold or flu-like symptoms.

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Lake Del Valle park, including the marina and campground, remained open. Fishing and boating are also still allowed, although fish should be thoroughly cleaned and boaters should wash their hands after having contact with the water, the park district said.

Toxic algae has plagued other lakes in the district, including Quarry Lakes in Fremont, Lake Chabot in Castro Valley, Lake Temescal in Oakland, and Lake Anza in Berkeley.