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The lake is warmer compared to the other lakes because of its shallow depth and continues to pose a problem for the two nuclear power plants that require cold water to cool the reactors. The normal low-water mark is 0.33 feet (0.10 m) below datum (601.1 ft or 183.2 m). The Great Lakes experience sea-like characteristics such as strong currents, distant horizon, great depth, sustained winds and rolling waves, and are sometimes known as inland seas. The lake has a mean elevation of 571 feet above the sea level, a length of 209 nautical miles and a breadth of 50 nautical miles at its widest. "NOAA®" and the NOAA ® emblem are registered trademarks of the National Oceanic and Atmospheric Administration. - Advanced Map Options - Plotter Sync - Relief Shading Check if your GPS plotter model is compatible with advanced features and make sure it is running the latest software.
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This tool should be used strictly as a planning reference tool and not for navigation, permitting, or other legal purposes.
The lake's surface temperature rose by 4.5 °F (2.5 °C) from 1979 to 2006.. The Social Vulnerability Index, which shows areas of high human vulnerability to hazards, is based on population attributes (e.g., age and poverty) and the built environment.
The lake is so massive and its volume so large that, were it to be emptied at its current rate (with no compensating additions of water), it would take 191 years. The lake’s drainage basin is 49,300 square miles (127,700 square km), exclusive of its surface area of 31,700 square miles (82,100 square km). The average depth of Lake Michigan is 279 ft while its deepest point is 923 ft. Lake Huron forms the Eastern portion of Lake Michigan-Huron. Lake Superior receives water from approximately 200 rivers, of which the largest are the Nipigon (from the north) and the St. Louis (from the west). Lake Superior drains into Lake Huron via the St. Marys River. The Great Lakes are the second largest freshwater lakes in the world after Lake Baikal and account for 21% of the surface freshwater. As water levels rise and drop, businesses may be positively or negatively affected. coast.noaa.gov/arcgis/rest/services/LakeLevels, Social Vulnerability Index data available upon request.
It is the shallowest of the Great Lakes with an average depth of 62 feet and a maximum depth of 210 feet. All rights reserved. Lake Superior’s Deepest Point is 1,333 ft (406 m) deep! Other well-known islands include Madeline Island in the state of Wisconsin, Michipicoten Island in the province of Ontario, and Grand Island (the location of the Grand Island National Recreation Area) in the state of Michigan. The lake is bounded by Ontario and Minnesota to the north and west, and Wisconsin and Michigan to the south. Water levels, including diversions of water from the Hudson Bay watershed, are regulated by the International Lake Superior Board of Control, which was established in 1914 by the International Joint Commission. In place of the present eastern lower Great Lakes (Erie and Ontario), a scarp-and-vale topography existed, with the high front of the Niagara limestone scarp separating vales of shale to the west and east.…. At Thunder Bay, grain from the Canadian prairies is transferred from rail to ship. Lake Superior is fed by more than 200 rivers, including the Nipigon River, the St. Louis River, the Pigeon River, the Pic River, the White River, the Michipicoten River, the Bois Brule River and the Kaministiquia River. NOAA RNC® is a trademark of the National Oceanic and Atmospheric Administration. Mapping future conditions involves many unknowns. For a detailed description of the confidence levels and their computation, see the methods document.
Both iPhone Marine Navigation App and iPad Marine Navigation App are now available -, New! above Lake Huron). Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox.
 Water levels recovered within a few days.
Choose any offshore point in Lake Superior to view an accurate marine weather forecast.
Lake Superior is the largest of the Great Lakes of North America, the world's largest freshwater lake by surface area, and the third largest freshwater lake by volume. The data and maps in this tool are provided “as is,” without warranty to their performance, merchantable state, or fitness for any particular purpose.  It is also a reflection of relatively small human population and small amount of agriculture in its watershed. It is shared by the Canadian province of Ontario to the north, the U.S. state of Minnesota to the west, and Wisconsin and the Upper Peninsula of Michigan to the south.
Dark areas represent areas with higher concentrations of employment. The average depth of Lake Huron is 195 feet while its deepest point is 750 ft. Lake Erie is the fourth largest of the Great Lakes with an area of 9,910 square miles and the smallest by volume with 116 cubic miles of water. Pierre Espirit Radisson and Médard Chouart des Groseilliers gathered a valuable cargo of furs during their extensive travels on the lake (1659–60).
The wreck was immortalized by Gordon Lightfoot in his ballad "The Wreck of the Edmund Fitzgerald". Bounded on the east and north by Ontario (Canada), on the west by Minnesota (U.S.), and on the south by Wisconsin and Michigan (U.S.), it discharges into Lake Huron at its eastern end via the St. Marys River. The principal islands in the lake are Isle Royale, a U.S. national park; the Apostle Islands, near the Wisconsin shore; Michipicoten, on the east side; and St. Ignace, near the mouth of the Nipigon River (Canada).
During the nine-month period of October 1925 to June 1926, water levels ranged from 1.58 feet (0.48 m) to 0.33 feet (0.10 m) below Chart Datum. Lake Michigan is located entirely within the US. Henry Wadsworth Longfellow wrote the name as "Gitche Gumee" in the poem The Song of Hiawatha, as did Gordon Lightfoot in his song "The Wreck of the Edmund Fitzgerald." New York and Michigan are two of several nonparticipatory states.
 Lake Superior contains 2,900 cubic miles (12,100 km³) of water.
They do not account for erosion, subsidence, or future construction. Conversely, there is a 20% or less likelihood that the area will be dry. Another culture known as the Terminal Woodland Indians (c. AD 900–1650) has been found. Lake Superior is the largest freshwater lake in the world in area and the third largest in volume, behind Lake Baikal in Siberia and Lake Tanganyika in East Africa. The Marine Navigation App provides advanced features of a Marine Chartplotter including adjusting water level offset and custom depth shading. Trade remained in the hands of the British until 1817, when John Jacob Astor’s American Fur Company took over south of the Canadian border.
3D Nautical Wood Chart Map: Lake Superior Bathymetric Art.
The southern shore of Lake Superior between Grand Marais, Michigan, and Whitefish Point is known as the "Graveyard of the Great Lakes" and more ships have been lost around the Whitefish Point area than any other part of Lake Superior. Duluth-Superior, at the western end of Lake Superior, is the most inland point on the St. Lawrence Seaway and the most inland port in the world. The retreat left gravel, sand, clay and boulder deposits. Users can also jump to particular water levels by clicking on individual numbers. The larger cities on Lake Superior include the twin ports of Duluth, Minnesota and Superior, Wisconsin; Thunder Bay, Ontario; Marquette, Michigan; and the twin cities of Sault Ste. The mapping process is designed to give the most accurate picture of water extent possible, but inherent data errors introduce some uncertainty in the exact water extents.
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