Cleaning up bodies of water choked with toxic algae has proved difficult. The project to repair Grand Lake is one of the clearest successes
By Kris Maher | Photographs by Maddie McGarvey for The Wall Street Journal Sept. 18, 2019 12:12 pm ET CELINA, Ohio—Signs posted around one of the country’s biggest man-made lakes read: “Danger: Avoid all contact with the water.”
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Beginning in 2012, wetlands areas were built around the lake, which was hand dug in the 1830s. The thick stands of bulrushes and other plants have reduced phosphorous and nitrogen levels in water entering the wetlands before reaching the lake by as much as 90%, Dr. Jacquemin said. Ohio has instituted rules for area farmers aimed at lowering nutrient runoff from fields. The state’s Department of Natural Resources has also dredged the lake bottom to remove nutrient-loaded sediment, and tried to clean up one of Grand Lake’s beaches near St. Marys by building a rock jetty and installing aerators and a curtain to filter water.
Ms. Grube said she hopes the warning signs at the St. Marys beach will be removed by next spring. “Local people feel we’ve gotten a bad break,” she said. “Most of us love this lake.”
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