Riley Lake Beach in Eden Prairie is closed after city officials detected a blue-green algae bloom near the beach and boat launch, the city announced Wednesday afternoon.
The closure will remain in place until water quality tests confirm it is safe to reopen, according to the city.
Blue-green algae, a type of bacteria found in many Minnesota lakes and ponds, can multiply rapidly in warm, stagnant water rich in nutrients such as phosphorus. Blooms often resemble pea soup or bright green paint and may produce a strong, swampy odor.
Not all blue-green algae are harmful, but because toxicity cannot be determined by appearance alone, health officials recommend avoiding contact with affected water. Direct exposure can pose health risks to people and animals, with pets especially vulnerable because they may swallow more water while swimming.
The city advises residents to avoid swimming or wading in water where algae are visible or clarity is less than three feet, and to rinse off after being in any lake water.
More information about harmful algal blooms is available from the Minnesota Department of Health and the Minnesota Pollution Control Agency.
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