This image shows the reservoir of the Kennebeck River known as Wyman Lake. it is formed by the Wyman Dam, a hydroelectric source for central Maine.
Bicknell Mfg. Co., 16 Pitt St. Portland, ME
The description states simply: WYMAN LAKE
–The Wyman Lake reservoir is one of the largest lakes in Maine.
This image likely dates from the 1930s.