Lake Michigan

Lake Michigan

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]

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 cubic km) 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.

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:

Illinois
Chicago
Evanston
Highland Park
North Chicago
Waukegan

Indiana
East Chicago
Gary
Hammond
Michigan City
Portage

Michigan
Holland
Muskegon
St. Joseph
Benton Harbor

Wisconsin
Green Bay
Kenosha
Manitowoc
Milwaukee
Racine
Sheboygan

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.

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.

Islands

Beaver Island
North Manitou Island
South Manitou Island
Washington Island
Rock Island

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

Lighthouses

Illinois lighthouses
Indiana lighthouses
Michigan lighthouses
Wisconsin lighthouses

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."

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.


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


External links

EPA's Great Lakes Atlas

Michigan DNR map of Lake Michigan