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.
Otisco Lake is the easternmost of New York's eleven Finger Lakes. The 2,048-acre lake is located in Onondaga County, southwest of the city of Syracuse.
The gorge where Keuka Lake Outlet drops between Kueka Lake and Seneca Lake is quite impressive, dropping despite the hills around it rising.
The causeway is an abandoned roadway that once spanned the lake. Thereβs a section that once had a bridge, which boaters now use to move back and forth between the southern and northern ends of the lake.
The bridge was washed out by high water and wind in 1929 and never replaced, according to Tony Geiss, deputy director of the Onondaga County Water Authority. The 100-yard area where people fish is located on the western side of the lake and is accessible from West Valley Road.
https://www.syracuse.com/outdoors/2012/06/cny_shoreline_hot_spots_the_ca.html