| Lake Admiralty | |
|---|---|
  Lake Admiralty  Lake Admiralty  Lake Admiralty | |
| Location | North America |
| Group | Great Lakes |
| Coordinates | 43°34′55″N77°19′12″W / 43.582°N 77.32°W /43.582; -77.32 |
| Lake type | former lake |
| Etymology | Admiralty |
| Primary inflows | Laurentide Ice Sheet |
| Primary outflows | Mohawk River to theHudson River |
| Basin countries | Canada United States |
| First flooded | 12,000 years before present |
| Max. length | 241 mi (388 km) |
| Max. width | 57 mi (92 km) |
| Residence time | 7300 years in existence |
| Surface elevation | 178 ft (54 m) |
| References | Lewis CFM, Cameron GDM, Anderson TW, Heil CW Jr, Gareau PL. 2012. Lake levels in the Erie Basin of the Laurentian Great Lakes. Journal of Paleolimnology 47:493-511. |
Admiralty Lake was aproglacial lake in the basin of what is nowLake Ontario.[1][2]The shoreline of Admiralty Lake was about 20 metres (66 ft) lower than Lake Ontario. The shoreline ofGlacial Lake Iroquois, an earlier proglacial lake, was much higher than Lake Ontario's, because a lobe of theLaurentian Glacier blocked what is now the valley of theSt Lawrence River. Lake Iroquois drained over theNiagara Escarpment, and down theMohawk River. When the lobe of the glacier retreated the weight of the glacier kept the outlet of the St Lawrence River lower than the current level. As the glacier continued to retreat the region of theThousand Islands rebounded, and the lake filled to its current level.
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