State officials say small amounts of harmful blue-green algae have led to testing and a sign warning swimmers not to swallow the water at a western Ohio reservoir.
But an Ohio Department of Natural Resources spokeswoman says the toxin levels are not enough to issue a public health advisory for Clarence J. Brown Reservoir in Buck Creek State Park. The Dayton Daily News reports the park north of Springfield attracts about 380,000 people annually for boating, swimming, fishing and camping.
Officials say testing of the reservoir will continue.
Toxic algae caused problems in recent years for Grand Lake St. Marys, the state's largest inland lake. An algae bloom there in 2010 forced officials to urge visitors not to touch the water or eat fish from it.