A meeting point
Lakes Superior, Michigan, Huron, and Erie all drain into the Niagara Falls before ultimately making their way into Lake Ontario. These four lakes make slightly more than 20% of the world’s entire supply of fresh water. So, you can see just how challenging it was for the engineers to plug up the river in 1969.
The farthest Great Lake from Niagara Falls, Lake Superior, is about 500 miles away. This can also give you a pretty good idea of just how massive the glaciers had to be 10,000 years ago for water to carve its way across several states.