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A map of the Great Lakes Basin showing the five sub-basins. Left to right they are: Superior (magenta); Michigan (cyan); Huron (green); Erie (yellow); Ontario (red). Though the five lakes lie in separate basins, they form a single, naturally interconnected body of fresh water, within the Great Lakes Basin. As a chain of lakes and rivers, they ...
The Great Lakes Waterway (GLW) is a ... The elevation change from Lake Superior to sea level is 601 feet (183 m). ... Map of the North American Great Lakes and the St ...
American limnologist J. Val Klump was the first person to reach the lowest depth of Lake Superior on July 30, 1985, as part of a scientific expedition, which at 122 fathoms 1 foot (733 ft or 223 m) below sea level is the second-lowest spot in the continental interior of the United States and the third-lowest spot in the interior of the North ...
At its deepest point, Lake Erie is 210 feet (64 m) deep, making it the only Great Lake whose deepest point is above sea level. [ 13 ] Located on the International Boundary between Canada and the United States , Lake Erie's northern shore is the Canadian province of Ontario , specifically the Ontario Peninsula , with the U.S. states of Michigan ...
When its islands are included, the lake's shoreline is 712 miles (1,146 km) long. As the last lake in the Great Lakes' hydrologic chain, Lake Ontario has the lowest mean surface elevation of the lakes at 243 feet (74 m) [6] above sea level; 326 feet (99 m) lower than its neighbor
The Great Lakes Basin consists of the Great Lakes and the surrounding lands of the states of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania, and Wisconsin in the United States, and the province of Ontario in Canada, whose direct surface runoff and watersheds form a large drainage basin that feeds into the lakes.
The last effort to map the lakes came in the 1970s. Maps were largely created using single-beam sonar technology similar to today's commercially available depth- and fish-finders. The system produced maps covering only about 15% of mostly coastal lake bottom, said Tim Kearns, a spokesperson for the Great Lakes Observing System.
Depths are measured from the chart datum, which is related to the local sea level. The chart datum varies according to the standard used by each national Hydrographic Office . In general, the trend is towards using lowest astronomical tide (LAT), the lowest tide predicted in the full tidal cycle, but in non-tidal areas and some tidal areas Mean ...