At one time, Lake Vermont may have reached nearly as far south as to what is now Albany, New York. The surface of the lake was about 500 feet (150 m) above present day Lake Champlain, and was up to 900 feet (270 m) deep. The lake contained muddy water, and the sediment of Lake Vermont contains silt/clay varves, with silt being deposited during summer and clay during the less-energetic flow of winter.