Lake Michigan
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| Lake Michigan | |
|---|---|
| | |
| Coordinates | |
| Basin countries | United States |
| Max. length | 307 mi (494 km) |
| Max. width | 118 mi (190 km) |
| Surface area | 22,400 sq mi (58,016 km²)[1] |
| Average depth | 279 ft (85 m) |
| Max. depth | 923 ft (282 m)[1] |
| Water volume | 1,180 cu mi (4,918 km³) |
| Residence time (of lake water) | 99 years |
| Shore length1 | 1,638 mi (2,633 km) |
| Surface elevation | 577 ft (176 m)[1] |
| Islands | see list |
| Settlements | Milwaukee Chicago See article for others. |
| 1 Shore length is not a well-defined measure. | |
Lake Michigan is one of the five Great Lakes of North America, and the only one located entirely within the United States. It is bounded, from west to east, by the U.S. states of Wisconsin, Illinois, Indiana, and Michigan. The word "Michigan" was originally used to refer to the lake itself, and is believed to come from the Ojibwa Indian word mishigami, meaning "great water."[2] The lake is slightly larger than the country of Croatia.
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[edit] Geography
Lake Michigan (44° N, 87° W) is the only one of the Great Lakes wholly within the borders of the United States; the others are shared with Canada. It has a surface area of 22,400 square miles (58,016 km²),[1] making it the largest freshwater lake in the U.S., the largest lake entirely within one country by surface area (Lake Baikal, in Russia, is by water volume), and the fifth largest lake in the world. It is 307 miles (494 km) long by 118 miles (190 km) wide with a shoreline 1,640 miles (2,633 km) long. The lake's average depth is 279 feet (85 m), while its greatest depth is 923 feet (281 m).[1] It contains a volume of 1,180 cubic miles (4,918 km³) of water. Its surface averages 577 feet (176 m)[1] above sea level, the same as Lake Huron, to which it is connected through the Straits of Mackinac.
[edit] Major cities
12 million people live along Lake Michigan's shores. Many small cities in Northern Michigan are centered on a tourist base that takes advantage of the beauty and recreational opportunities offered by Lake Michigan. These cities have large seasonal populations that arrive from Chicago, Milwaukee, Detroit, and inland cities in Southern Michigan. The southern tip of the lake is heavily industrialized. Cities on the shores of Lake Michigan with populations larger than 30,000 include:
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Illinois |
Indiana |
Michigan |
Wisconsin |
[edit] Beaches
Lake Michigan beaches, especially those in Michigan and Northern Indiana, are known for their beauty. The region is often referred to as the "Third Coast" of the United States, after those of the Atlantic Ocean and the Pacific Ocean. The sand is soft and off-white, known as "singing sands" because of the squeaking noise (caused by high quartz content) made when one walks across it. There are often high sand dunes covered in green beach grass and sand cherries, and the water is usually clear and cold (between 55 and 70 °F [13 and 21 °C]) [1], even in late summer. Lake Michigan beaches in Northern Michigan are the only place in the world, aside from a few inland lakes in that region, where one can find Petoskey stones, the state stone.
The beaches of the western coast and the northernmost part of the east coast are rocky, while the southern and eastern beaches are sandy and dune-covered. This is partly because of the prevailing winds from the west which also cause thick layers of ice to build up on the eastern shore in winter.
Contrary to recent reports, Chicago annually imports fresh sand to replenish the popular city beaches (similar to Key West) but much of the city waterfront is parks, stone revetments, marinas or residential developments in the north or industrial sites in the south. (see Chicago beaches)
Some environmental problems still plague the lake. Steel mills are visible along the Indiana shoreline, and the pollution caused by these mills is believed to contribute to the color of sunsets. Also, the Chicago Tribune reported that BP is a major polluter, dumping thousands of pounds of ammonia and raw sludge into Lake Michigan every day from its Whiting, Indiana, oil refinery. [3]
The Chicago skyline can be seen from the Indiana shore, but when standing on the beaches in Wisconsin or Lower Michigan, it is impossible to see across the lake, providing a view similar to that found on ocean coasts.
[edit] Car ferries
Motorists can cross Lake Michigan by the SS Badger, a ferry that runs from Manitowoc, Wisconsin, to Ludington, Michigan. The Lake Express is another ferry, established in 2004, which carries motorists across the lake between Milwaukee, Wisconsin, and Muskegon, Michigan, at a much higher speed than the SS Badger.
[edit] Islands
[edit] Parks
The National Park Service maintains the Sleeping Bear Dunes National Lakeshore and Indiana Dunes National Lakeshore. Part of the shoreline is within the Hiawatha National Forest and the Manistee National Forest. The Michigan Islands National Wildlife Refuge is within the lake.
There are numerous state parks located on the shores of the lake or on islands within the lake.
- Peninsula State Park
- Holland State Park
- Grand Haven State Park
- Hoffmaster State Park
- Ludington State Park
- Silver Lake State Park
- Illinois Beach State Park
- Indiana Dunes State Park
[edit] Lighthouses
[edit] Geology
Geologically and hydrologically, Michigan and Huron are the same body of water (sometimes called Lake Michigan-Huron), but are geographically distinct. Counted together, it is the largest fresh water body in the world by surface area. The Mackinac Bridge is generally considered the dividing line between them. Both lakes are part of the Great Lakes Waterway. In earlier maps of the region, the name Lake Illinois has been found in place of "Michigan".
[edit] Ecology
Lake Michigan is home to a variety of species of fish and other organisms. It was originally home to lake trout, yellow perch, panfish, largemouth bass, smallmouth bass, carp, bowfin, as well as some species of catfish. In recent years overfishing has caused a decline in lake trout which ultimately caused an increase in the alewife population. As a result, coho and chinook salmon were introduced as a predator of alewives to decrease the alewife population. Lake Michigan is now being stocked with several species of fish. However, several invader species introduced, such as lampreys, threaten the vitality of fish populations.
[edit] See also
- Chicago River
- Grand Traverse Bay
- Door Peninsula
- Bay of Green Bay
- Leelanau Peninsula
- Little Bay de Noc
- Little Traverse Bay
- Seiche
- Great Lakes Areas of Concern
- Jardine Water Purification Plant 1 billion gal. of water/day
[edit] References
- ^ a b c d e f Wright, John W. (ed.); Editors and reporters of The New York Times (2006). The New York Times Almanac, 2007, New York, New York: Penguin Books, 64. ISBN 0-14-303820-6.
- ^ Superior Watershed Partnership Projects.
- ^ http://www.chicagotribune.com/news/nationworld/chi-pollute_15jul15,1,2304440.story?coll=chi-newsnationworld-hed/
[edit] External links
| North American Great Lakes |
|---|
| Superior · Michigan · Huron · Erie · Ontario |
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