Lake Ontario Tidbits
The glaciers began to retreat almost 14,000 years ago.  Most of the ice fields left the Great Lakes region about 7,000-9,000 years ago.  The Great Lakes and their connecting channels and the St. Lawrence River form the largest fresh surface water system on Earth Lake Ontario is 325 feet lower than Lake Erie.  The outlet from Lake Superior , at the top of the system, moves about 76,000 cubic feet of water per second.  By comparison, the outlet from Lake Ontario, the last lake in the chain, moves about 243,000 cubic feet per second on average.  The control of lakes Superior and Ontario outflows are governed by the International Joint Commission's boards of control 14th largest lake in the world and the smallest of the Great Lakes.

Length: 193 miles
Breadth: 53 miles
Avg.  Depth: 283 feet
Max.  Depth: 802 feet
Volume: 393 Cubic miles
Water surface: 7,340 square miles
Drainage basin: 24,720 square miles
Shoreline length (incl. islands): 712 miles