The National Park service is warning people about swimming or boating in Lake Powell over the holiday weekend. The department is advising people to be extra cautious of algae blooms after cyanotoxins were detected in the water of the Glen Canyon National Recreation Area. Cyanotoxins are toxins produced by blue-green algae in water. These algae blooms can cause symptoms from mild rashes to serve illness. Lake Powell was deemed at the high end of safe exposure by the National Parks Service, but officials still advise people to take precautions when in or around the water. Visitors are advised to not go boating in scummy water or areas with algae blooms. Officials say to clean and drain boats and gear when done. Officials also advise against swimming in murky or algae filled water.

Related articles:

• U.S. National Park Service: News release: Water advisory for Lake Powell 
• 12News (Phoenix, Ariz.): Water advisory issued for Lake Powell ahead of 4th of July weekend