Lake Duluth

Lake Duluth
Lake Duluth
	Glacial Lake Duluth
	Lake Duluth
Location	North America
Group	Great Lakes
Coordinates	47°40′N 88°48′W / 47.667°N 88.800°W
Lake type	former lake
Etymology	Sieur Duluth
Primary inflows	Laurentide Ice Sheet
Primary outflows	St. Croix River
Basin countries	Canada; United States
First flooded	11,000 years before present
Max. length	152 mi (245 km)
Max. width	73 mi (117 km)
Surface elevation	1,300 ft (396 m)
References	Professional Paper 154—A, Moriaines and Shore Lines of Lake Superior Basin: Frank Leverett; United States Government Printing Office, Washington; February 9, 1929

Lake Duluth was a proglacial lake that formed in the Lake Superior drainage basin as the Laurentide Ice Sheet retreated.^[1] The oldest existing shorelines were formed after retreat from the Greatlakean advance (previously called the Valders), sometime around 11,000 years B.P. Lake Duluth formed at the western end of the Lake Superior basin. Lake Duluth overflowed south through outlets in Minnesota and Wisconsin at an elevation of around 331 m above sea level.

^ "Post-Valders Lake Stages in the Lake Superior Basin" Archived 2012-10-19 at the Wayback Machine, in Glacial and Postglacial Geologic History of Isle Royale National Park, Michigan Archived 2006-10-12 at the Wayback Machine by N. King Huber, USGS Geological Survey Professional Paper 754-A

[USGS-1] "Post-Valders Lake Stages in the Lake Superior Basin" Archived 2012-10-19 at the Wayback Machine, in Glacial and Postglacial Geologic History of Isle Royale National Park, Michigan Archived 2006-10-12 at the Wayback Machine by N. King Huber, USGS Geological Survey Professional Paper 754-A

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