Back when AES Greenridge first went online, they dumped the coal ash in settling ponds along Seneca Lake. In later years, they, well the State of New York, decided it was a better to build a large coal ash landfill farther away from the lake and not dump it directly in the lake.

The gorge where Keuka Lake Outlet drops between Kueka Lake and Seneca Lake is quite impressive, dropping despite the hills around it rising.