Grand Lake St. Marys was dug in the 1800s by Irish and German immigrants who were paid 30 cents a day and a jigger of whiskey to fend off malaria.

Blue-green algae have hampered tourism near Grand Lake St. Marys in western Ohio. Algae growth was accelerated this year because of unseasonably warm winter and spring weather.

Celina police are continuing their death investigation after a man’s body was pulled from Grand Lake St. Marys on Tuesday night. >> Fairborn police investigating a shooting Around 7 p.m. Tuesday ...

Around 7 p.m. Tuesday, Celina police responded to a report of a body floating in the lake near the shoreline along South Main Street at the lighthouse.

Except at Grand Lake St. Marys in western Ohio. Here, the water already is colored by cyanobacteria, the blue-green algae that plagues Ohio each year and contaminated Toledo's drinking water in 2014.

Grand Lake St. Marys had been known as the largest man-made reservoir in the world, but it is also shallow, gets lots of sunshine, and heats up quickly in the spring.

Peggy Turbett, Plain Dealer file Testing at Grand Lake St. Marys was prompted by an algae outbreak on Grand Lake St. Marys in western Ohio. These children were fishing there in 2006.

Toxic blue-green algae is again making swimming hazardous at Grand Lake St. Marys in western Ohio. It’s been a recurring problem at the 20-square-mile lake between Dayton and Toledo.

Campers and boaters can benefit from special discounts at Grand Lake St. Marys State Park beginning April 1. The park is offering 25?percent off campsites and dock rentals through Oct. 31, ...