Officials have now put three Ohio state park lakes off limits because of toxic, blue-green algae blooming in the water.
A story from the AP says, warning signs were posted in recent days around Cutler Lake at Blue Rock State Park in eastern Ohio's Muskingum County. A park administrator says employees observed the algae for the first time on Aug. 1.
Visitors are being advised not to touch the water or go boating on the lake.
Other warnings are in effect at the lake in Burr Oak State Park in southeast Ohio, and at western Ohio's Grand Lake St. Marys, the state's largest inland lake.