What was Lake Algonquin in the history of the Great Lakes?

Lake Algonquin was a massive glacial lake that existed during the Pleistocene Epoch as the Laurentide Ice Sheet retreated from North America. Covering an area of approximately 250,000 square kilometers (100,000 square miles) with depths reaching 460 meters (1,500 feet), it occupied the basins now containing Lake Superior, Lake Michigan, and Lake Huron.12

Formed during a high-water stage as glaciers receded, Lake Algonquin served as a critical transitional body of water in the development of the modern Great Lakes system. Throughout its existence, the lake drained through various channels, including the Ottawa River valley and the Trent River valley. As the ice sheet continued to retreat and the Earth's crust underwent postglacial uplift, the lake's drainage patterns shifted, eventually leading to the formation of the contemporary Great Lakes and other remnants such as Lake Nipissing, Lake Simcoe, and Lake Nipigon.12