Lake Winona is a small lake NW of Meredith NH. It is 148 acres in size, average depth is 17 ft. Here is a link to NH F&G map of lake. Note the boat launch is gravel and listed as limited.
http://www.wildnh.com/Fishing/bathy_...newhampton.pdf
In comparison, Saratoga Lake in NY is 44 square miles in size while Lake Winona is less than one square mile in area (1 sq mile is 160 acres).
Not sure what you have for a boat, and what boating activities you are looking to be able to do.
A good comparison is Lake Winnipesaukee and Lake George. Similar size.
Welcome to the forum.