Rhode Island officials are warning people to stay clear of the Slack Reservoir because of a potentially dangerous blue-green algae bloom.
The state departments of health and environmental management say all recreation such as swimming, fishing and boating should be avoided until further notice. The reservoir spans the Smithfield and Johnston town line.
High levels of the toxins were found in water samples taken from the area known as "Little Beach."
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Officials say the blue-green algae can produce toxins that are harmful to humans and animals. Contact with the skin can cause irritation to nose, eyes and throat. Swallowing water containing the algae can cause stomach discomfort and, in rare cases, more serious health problems including fever, dizziness and nervous system damage.