| Lake Frontenac | |
| Coords: | 43.58°N -77.19°W |
| Location: | North America |
| Group: | Great Lakes |
| Lake Type: | former lake |
| Etymology: | Louis de Buade, Comte de Frontenac et de Palluau, Governor of New France, 1672-1682. |
| Inflow: | Laurentide Ice Sheet |
| Basin Countries: | Canada United States |
| Date-Flooded: | 10,000 years before present |
| Length: | 194miles |
| Width: | 57miles |
| Elevation: | 2440NaN0 |
| Reference: | United States Geological Survey, George Otis Smith, Director; The Pleistocene of Indiana and Michigan and the History of the Great Lakes; Frank Leverett and Frank B. Taylor; Department of the Interior, Monographs of the United States Geological Survey; Volume LIII; Washington; Government Printing Office; 1915 |
| Pushpin Map: | Ontario#New York |
| Pushpin Label Position: | “right” |
Lake Frontenac was a proglacial lake in the basin of what is now Lake Ontario.[1] [2] The sudden influx of fresh water into the Atlantic, as the retreat of the Laurentian Glacier triggered a sudden drop in the lake's water level, may in turn have triggered the onset of the Younger Dryas, 1000-year period of renewed cooling approximately 12000 years ago.
When the retreating ice opened a passage eastward around the north side of the Adirondack Mountains to the basin of Lake Champlain, the lake level fell and the outlet at Rome was abandoned. At this stage the ice barrier or dam rested about on the Frontenac axis of the pre-Cambrian rocks and the lake may therefore be called Lake Frontenac.