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In the decade after the original survey was ended, it became clear that the charts were not sufficient; for example, since the deepest draft vessels used in the Great Lakes in the mid-late 1800s drew only 12 feet (3.7 m) of water, the Survey's charts only showed depths of 18 feet (5.5 m) or less. [5]
A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
Older charts, as well as those published by the United States government, may use feet or fathoms. Depth contour lines show the shape of underwater relief. Coloured areas of the sea emphasise shallow water and dangerous underwater obstructions. Depths are measured from the chart datum, which is related to the local sea level. The chart datum ...
Lake Superior has fewer dissolved nutrients relative to its water volume than the other Great Lakes and so is less productive in terms of fish populations and is an oligotrophic lake. This is a result of the underdeveloped soils found in its relatively small watershed. [ 21 ]
Lake Erie laps away in northern Ohio and is the 11th largest lake in the world. Here are some facts about the Great Lakes. Lake Erie. Average depth: 62 feet. Maximum depth: 210 feet. Size: 9,910 ...
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border.The five lakes are Superior, Michigan, Huron, Erie, and Ontario (though hydrologically, Michigan and Huron are a single body of water, as they are joined by the Straits of Mackinac).
It is the shallowest of the Great Lakes with an average depth of 10 fathoms 3 feet or 63 ft (19 m) [7] and a maximum depth of 35 fathoms (210 ft; 64 m) [7] [8] Because Erie is the shallowest, it is also the warmest of the Great Lakes, [17] and in 1999 this almost became a problem for two nuclear power plants which require cool lake water to ...
In the winter of 1964, Lakes Michigan and Huron reached their lowest level at 1.38 feet (42 cm) below datum. [16] As with the high-water records, monthly low-water records were set each month from February 1964 through January 1965. During this twelve-month period, water levels ranged from 1.38 to 0.71 feet (42–22 cm) below Chart Datum. [16]