The blue-green algae that has taken over Grand Lake St. Marys this summer was discovered on a Y campground in Bellefontaine. Summer campers have been banned from swimming in the camp’s lake.
Grand Lake St. Marys in western Ohio is the state’s largest inland lake. It’s a state park that for years has been a popular tourist destination. But farm runoff has polluted the waters. Now there’s an algae bloom that’s the worst in the lake’s history. Tourism is drying up and some local people are irritated by what they believe is inaction by state officials.