By Jennifer McRae

DENVER (CBS4)– Potentially deadly blue-green algae at Sloan’s Lake has closed the popular water recreation spot in Denver. The Denver Department of Public Health and Environment has closed the lake and all contact with the water and all recreational activities are prohibited, including fishing, wading, boating and use of canoes, paddleboards and kayaks.

A walker takes advantage of the pathway around the lake at Sloan's Lake Park on April 8, 2020 in Denver. Sloan's Lake Park is home to the biggest lake in Denver and is the city’s second largest park. While many of the amenities are closed due to the COVID-19 crisis, the park remains open.

A walker takes advantage of the pathway around the lake at Sloan’s Lake Park on April 8, 2020 in Denver. Sloan’s Lake Park is home to the biggest lake in Denver and is the city’s second largest park. (Photo by Matthew Stockman/Getty Images)

Pet owners should not let their dogs, cats or other pets drink from the water. The cyanobacteria can be poisonous to animals and humans, or it could cause neurological problems.

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If your pet comes into contact with it, you’re urged to wash your pet with fresh, clean water. Symptoms like vomiting, weakness or weakness typically show between 15 minutes or several days.

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Notification signs about the algae were posted last month and have been replaced with closure signs warning about the blue-green algae.

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The algae typically develop in warm temperatures. City health experts expect the algae to remain for another month or until temperatures cool. The closure is temporary and Sloan’s Lake will reopen when the algae bloom and cyanotoxin levels drop.

Jennifer McRae