Hemlock Lake is one of the minor Finger Lakes. It is mostly located in Livingston County, New York, south of Rochester, with a portion overlapping into Ontario County.
Hemlock Lake is seven miles (12 km) long, and approximately a half-mile wide along most of its uniform north-south length. It has a surface area of 1,800 acres (7 km2), and maximum and mean depths of 91 feet (28 m) and 45 feet (14 m) respectively. Because the lake is a water source to Rochester, shore development is restricted and size limits pertain to boats and outboard motors.
A feature of the lake is its land-locked salmon. In addition, the lake contains rainbow trout, brown trout, lake trout, smallmouth bass, largemouth bass, rock bass, yellow perch, and white crappie.