A photo of the dam from County Route 7. Location of Conklingville Dam in New York Adirondack Park. The Conklingville Dam, in Hadley, Saratoga County, New York, is an earthen dam which holds back the Great Sacandaga Lake (in the town of Day, New York). The dam, completed in 1930, is owned by the Hudson River-Black River Regulating District.