Otsego Lake is a 4,046-acre (16.37 km2) lake located in Otsego County in the U.S. state of New York.
It is the source of the West Branch of Susquehanna River and largest lake in Otsego County.
The Village of Cooperstown is located at the southern end.
Between 10,000 and 12,000 years ago, glaciers of the Wisconsin glaciation filled the valley. Otsego Lake was formed when an ice tongue from a glacier carved out the Susquehanna River Valley. As the glaciers melted slowly, they filled in the valley they carved out.
On Otsego Lake, lake trout are the main species targeted by fishermen, as well as walleye and yellow perch. The lake also supports an exceptionally large smallmouth bass population. Other fish species present in the lake are brown trout, rock bass, largemouth bass, chain pickerel, bluegill, redfin pickerel, pumpkinseed, and landlocked atlantic salmon.
