Mountain Lake is a lake situated in southern Adirondack Park in Bleecker, New York. It is located just east of Great Sacandaga Lake. The lake was called Carpenter's Lake in the 19th century. The lake contains one small island, Elmer Island, located towards the western end. There is a dam on the northwestern end of the lake. Its outlet flows into Vandenburgh Pond. During an era of economic prosperity with leather and glove manufacturing in the local communities, the lake was a popular resort area for people of Gloversville and Johnstown in the late 18th and early 19th centuries. There was at one time an electric train line that ran from the northern end of Gloversville up Bleecker Mountain to a station at the lake for vacationers.