COLUMBUS — A warning about toxic blue-green algae has been lifted at the last Ohio state park lake that was still cautioning people.

Spokeswoman Heidi Hetzel-Evans says the Ohio Department of Natural Resources is finally closing the season on algae.

Summer alerts had covered 20 public lakes and ponds across the state, including Grand Lake St. Marys, Ohio’s largest inland lake.

The last advisory ended Thursday at Wingfoot Lake State Park, a new park at a former Goodyear Tire & Rubber Co. recreation area in Northeast Ohio’s Portage County.

High toxin levels were detected before the park officially opened in August.

Hetzel-Evans told The Columbus Dispatch state agencies will spend the winter working on how to combat algae next year.