Sylvan Lake (New York)

Sylvan Lake is located next to the community by that name in the Town of Beekman, New York, United States. It is the deepest and second-largest lake in Dutchess County.

It is a popular local recreation spot. Many summer camps are located along it, as well as a large private campground. Many residents from Chelsea Cove also use the lake recreationally.

Geography
It is an irregular rounded shape, with a 116 acre surface area, located near the town's southwestern border with East Fishkill. High unnamed hills rise to 820 ft to its northeast, 500 ft above the lake. The unincorporated hamlet of Sylvan Lake is located to its southeast and east. Dutchess County Route 10 runs northwest from the hamlet along the lakeshore, providing access to the nearby Taconic State Parkway via the NY 82 state highway at Arthursburg.

To the southwest are lower hills. The lake's unnamed outlet brook flows at first northward through a 91 acre wetland between two smaller hills at that end but soon turns southward, carrying the drainage from the lake and its 0.81 sqmi basin south a few miles to Fishkill Creek. From there it reaches the Hudson River at Beacon.

The lake is located adjacent to the Chelsea Cove housing complex and all its residents are permitted access to the lake. There is a small beach with a small area to wade in before it drops off into much deeper waters. Sylvan Lake Beach Park, a privately operated campground, is located along another shore. The remainder of the 1.8 mi shoreline is owned by private residences and summer camps.

Hydrology
The lake is 140 ft deep, the deepest in Dutchess County. Formerly a quarry used for mining, the slope is very steep and reaches maximum depth quickly near the center of the lake. The thermocline in the lake reaches about 40 degrees F. To scuba dive in the lake, advanced open water certification is needed. Equipment such as 7mml full body wetsuits including gloves and hood are necessary as are lights due to the murkiness of the water.

Recreation
The campground and camps have facilities for swimming in the lake near its shore. Boating is permitted on the lake as long as gasoline-powered engines are not used. Diving is also permitted with advanced open-water certification due to the lake's depth.

Angling, from either boats or the shoreline, is also permitted. Fishermen must have a valid New York state license. The lake has a bass population in its warmer areas, and the state Department of Environmental Conservation stocks it with 1,700 brown trout fry every spring. Special fishing regulations apply since the lake is also a popular ice fishing spot in winter. Trout may be taken all year round; there is no minimum size and up to five fish a day may be taken. Some anglers have taken trout as large as 10 lb.