Keystone Update

Mannford, OK –
Blue-green algae blooms found in Keystone Lake

MANNFORD, Okla. (AP) Federal officials are confirming two major outbreaks of blue-green algae in Keystone Lake near Mannford and Cleveland.

The U.S. Army Corps of Engineers' Tulsa District office said Saturday the blooms could be harmful but won't know for sure until test results are received.

In the interim, the agency has posted an advisory to boaters and swimmers that contact with the algae could be harmful. Toxins harmful to humans and animals can be produced in some blue-green algae blooms.

The Grand River Dam Authority cited toxicity levels from blue-green algae in recommending last week that people not come into contact with the water in Grand Lake in northeastern Oklahoma.

The Corps of Engineers also has closed a swim beach at Fort Gibson Lake because of a blue-green algae outbreak.

Copyright 2011 The Associated Press.