Winchester Boat Club | 77 followers on LinkedIn. Winchester Boat Club is a private club, located on the shore of Upper Mystic Lake in Winchester, Massachusetts with sailing, swimming and other activities available for our members. WBC is the home to the second largest Snipe Fleet in the United States, to very active N-10, Club 420, and Optimist fleets, and to loads of swimming, sailing and active summer fun. Membership in the Winchester Boat Club is by sponsorship only.