| 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.
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- ^ "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