Lake Michigan
Landsat image
Location of Lake Michigan in North America.
Lake Michigan
Lake Michigan bathymetric map.[1][2][3] The deepest point is marked with "×".[4]
LocationUnited States
GroupGreat Lakes
Coordinates44°N 87°W / 44°N 87°W / 44; -87Coordinates: 44°N 87°W / 44°N 87°W / 44; -87
Lake typeGlacial
Primary inflowsFox River, Grand River, Menominee River, Milwaukee River, Muskegon River, Kalamazoo River, St. Joseph River
Primary outflowsStraits of Mackinac, Chicago River, Calumet River
Basin countriesUnited States
Max. length307 mi (494 km)
Max. width118 mi (190 km)
Min. width91 mi (146 km)
Surface area22,404 sq mi (58,030 km2)[5]
Average depth279 ft (85 m)
Max. depth923 ft (281 m)[6]
Water volume1,180 cu mi (4,900 km3)
Residence time99 years
Shore length11,400 mi (2,300 km) plus 238 mi (383 km) for islands[7]
Surface elevation577 ft (176 m)[6]
Islandssee list
Settlementssee list
References[6]
1 Shore length is not a well-defined measure.
Map of Great Lakes (Lake Michigan in darker blue)
Map of Great Lakes (Lake Michigan in darker blue)

Lake Michigan is one of the five Great Lakes of North America. It is the second-largest of the Great Lakes by volume[5] (1,180 cu mi (4,900 km3)) and the third-largest by surface area (22,404 sq mi (58,030 km2)), after Lake Superior and Lake Huron. To the east, its basin is conjoined with that of Lake Huron through the narrow Straits of Mackinac, giving it the same surface elevation as its easterly counterpart; the two are technically a single lake.[8]

Lake Michigan is the largest lake by area in one country.[9] Located in the United States, it is shared, from west to east, by the states of Wisconsin, Illinois, Indiana, and Michigan. Ports along its shores include Milwaukee and the City of Green Bay in Wisconsin; Chicago in Illinois; Gary in Indiana; and Muskegon in Michigan. Green Bay is a large bay in its northwest, and Grand Traverse Bay is in the northeast. The word "Michigan" is believed to come from the Ojibwe word michi-gami meaning "great water".[10]

History

Further information: Lake Chicago

Some of the earliest human inhabitants of the Lake Michigan region were the Hopewell Native Americans. Their culture declined after 800 AD, and for the next few hundred years, the region was the home of peoples known as the Late Woodland Native Americans. In the early 17th century, when western European explorers made their first forays into the region, they encountered descendants of the Late Woodland Native Americans: the historic Chippewa; Menominee; Sauk; Fox; Winnebago; Miami; Ottawa; and Potawatomi peoples. The French explorer Jean Nicolet is believed to have been the first European to reach Lake Michigan, possibly in 1634 or 1638.[11] In the earliest European maps of the region, the name of Lake Illinois has been found in addition to that of "Michigan", named for the Illinois Confederation of tribes.[12]

Lake Michigan is joined via the narrow, open-water Straits of Mackinac with Lake Huron, and the combined body of water is sometimes called Michigan–Huron (also Huron–Michigan). The Straits of Mackinac were an important Native American and fur trade route. Located on the southern side of the straits is the town of Mackinaw City, Michigan, the site of Fort Michilimackinac, a reconstructed French fort founded in 1715, and on the northern side is St. Ignace, Michigan, site of a French Catholic mission to the Indians, founded in 1671. In 1673, Jacques Marquette, Louis Jolliet and their crew of five Métis voyageurs followed Lake Michigan to Green Bay and up the Fox River, nearly to its headwaters, in their search for the Mississippi River. By the late 18th century, the eastern end of the straits was controlled by Fort Mackinac on Mackinac Island, a British colonial and early American military base and fur trade center, founded in 1781.[13]

With the advent of European exploration into the area in the late 17th century, Lake Michigan became used as part of a line of waterways leading from the Saint Lawrence River to the Mississippi River and thence to the Gulf of Mexico.[14] French coureurs des bois and voyageurs established small ports and trading communities, such as Green Bay, on the lake during the late 17th and early 18th centuries.[15] In the 19th century, Lake Michigan was integral to the development of Chicago and the Midwestern United States west of the lake. For example, 90% of the grain shipped from Chicago travelled by ships east over Lake Michigan during the antebellum years. The volume rarely fell below 50% after the Civil War even with the major expansion of railroad shipping.[16]

The first person to reach the deep bottom of Lake Michigan was J. Val Klump, a scientist at the University of Wisconsin–Milwaukee in 1985. Klump reached the bottom via submersible as part of a research expedition.[17] In 2007, a row of stones paralleling an ancient shoreline was discovered by Mark Holley, professor of underwater archeology at Northwestern Michigan College. This formation lies 40 feet (12 m) below the surface of the lake. One of the stones is said to have a carving resembling a mastodon. The formation needed more study before it could be authenticated.[18][19] The warming of Lake Michigan was the subject of a 2018 report by Purdue University. In each decade since 1980, steady increases in obscure surface temperature have occurred. This is likely to lead to decreasing native habitat and to adversely affect native species survival, including game fish.[20]

Geography

Lake Michigan basin
Lake Michigan basin

Statistics and bathymetry

Lake Michigan is the only Great Lake that is wholly within the borders of the United States; the others are shared with Canada.[21] Lake Michigan has a surface area of 22,404 sq.mi (58,026 km2); (13,237 square miles, 34,284 km2 lying in Michigan,[6] 7,358 square miles, 19,056 km2 in Wisconsin, 234 square miles, 606 km2 in Indiana, & 1,576 square miles, 4,079 km2 in Illinois) making it the largest lake entirely within one country by surface area (Lake Baikal in Russia is larger by water volume) and the fifth-largest lake in the world. It is the larger half of Lake Michigan–Huron, which is the largest body of fresh water in the world by surface area. It is 307 miles (494 km) long by 118 miles (190 km) wide with a shoreline 1,640 miles (2,640 km) long. The lake's average depth is 46 fathoms 3 feet (279 ft; 85 m), while its greatest depth is 153 fathoms 5 feet (923 ft; 281 m).[6][22] It contains a volume of 1,180 cubic miles (4,918 km³) of water. Green Bay in the northwest is its largest bay. Grand Traverse Bay in its northeast is another large bay. Lake Michigan's deepest region, which lies in its northern half, is called Chippewa Basin (named after prehistoric Lake Chippewa) and is separated from South Chippewa Basin by a relatively shallower area called the Mid Lake Plateau.[23][24]

Cities

The Milwaukee lakefront
The Milwaukee lakefront
Chicago's Oak Street Beach
Chicago's Oak Street Beach

Twelve million people live along Lake Michigan's shores, mainly in the Chicago and Milwaukee metropolitan areas. The economy of many communities in northern Michigan and Door County, Wisconsin is supported by tourism, with large seasonal populations attracted by Lake Michigan.[25] Many seasonal residents have summer homes along the waterfront and return to other homes for the winter. The southern tip of the lake near Gary, Indiana, is heavily industrialized.

Cities on the shores of Lake Michigan include:

Michigan

Wisconsin

Connection to ocean and open water

Sunset at Nordhouse Dunes
Sunset at Nordhouse Dunes

In the late 20th century, construction of the Saint Lawrence Seaway and Great Lakes Waterway opened the Great Lakes to ocean-going vessels. But the wider ocean-going container ships that were developed later do not fit through the locks on these routes, which limits shipping on the lakes. Lake freighters are used on the lakes that are too large to pass the locks and enter the ocean. Despite their vast size, large sections of the Great Lakes freeze in winter, interrupting most shipping. Some icebreakers ply the lakes.

Lake Michigan is connected by the Illinois Waterway to the Gulf of Mexico via the Illinois River and the Mississippi River. Commercial tug-and-barge traffic on these waterways is heavy. Pleasure boats can enter or exit the Great Lakes by way of the Erie Canal and Hudson River in New York. The Erie Canal connects to the Great Lakes at the east end of Lake Erie (at Buffalo, New York) and at the south side of Lake Ontario (at Oswego, New York).

Beaches

View of Lake Michigan from Indiana Dunes National Park
View of Lake Michigan from Indiana Dunes National Park
Saugatuck Dunes State Park

Lake Michigan has many beaches. The region is often referred to as the "Third Coast"[26] of the United States, after those of the Atlantic Ocean and the Pacific Ocean. The sand is often soft and off-white, known as "singing sands" because of the squeaking noise (caused by high quartz content) it emits when walked upon. Some beaches have sand dunes covered in green beach grass and sand cherries, and the water is usually clear and cool, between 55 and 80 °F (13 and 27 °C),[27] even in the late summer months. However, because prevailing westerly winds tend to move the surface water toward the east, there is a flow of warmer water to the Michigan shore in the summer.[28]

The sand dunes located on the east shore of Lake Michigan are the largest freshwater dune system in the world. In multiple locations along the shoreline, the dunes rise several hundred feet above the lake surface. Large dune formations can be seen in many state parks, national forests and national parks along the Indiana and Michigan shoreline. Some of the most expansive and unique dune formations can be found at Indiana Dunes National Park, Saugatuck Dunes State Park, Warren Dunes State Park, Hoffmaster State Park, Silver Lake State Park, Ludington State Park, and Sleeping Bear Dunes National Lakeshore. Small dune formations can be found on the western shore of Lake Michigan at Illinois Beach State Park, and moderate-sized dune formations can be found in Kohler-Andrae State Park and Point Beach State Forest in Wisconsin. A large dune formation can be found in Whitefish Dunes State Park in Wisconsin in the Door Peninsula. Lake Michigan beaches in Northern Michigan are the only place in the world, aside from a few inland lakes in that region, where Petoskey stones, the Michigan state stone, can be found.[29]

The beaches of the western coast and the northernmost part of the east coast are often rocky, with some sandy beaches. The southern and eastern beaches are typically sandy and dune-covered. This is partly because of the prevailing winds from the west (which also cause thick layers of ice to build on the eastern shore in winter). The Chicago city waterfront has been developed for parks, beaches, harbors and marinas, and residential developments connected by the Chicago Lakefront Trail. Where there are no beaches or marinas, stone or concrete revetments protect the shoreline from erosion. The Chicago lakefront is accessible for about 24 miles (39 km) between the city's southern and northern limits along the lake.

Ferries

SS Badger operates ferry services between Manitowoc and Ludington
SS Badger operates ferry services between Manitowoc and Ludington

Two passenger and vehicle ferries operate ferry services on Lake Michigan, both connecting Wisconsin on the western shore with Michigan on the east. From May to October, the historic steamship, SS Badger, operates daily between Manitowoc, Wisconsin, and Ludington, Michigan,[30] connecting U.S. Highway 10 between the two cities. The Lake Express, established in 2004, carries passengers and vehicles across the lake between Milwaukee, Wisconsin, and Muskegon, Michigan.

Islands

Big Sable Point, Michigan

Parks

Lake view from the Sleeping Bear Dunes National Lakeshore, with people climbing uphill
Lake view from the Sleeping Bear Dunes National Lakeshore, with people climbing uphill
Chicago's North Avenue Beach, Lincoln Park
Lake Michigan and the Chicago skyline from Portage, Indiana
Lake Michigan and the Chicago skyline from Portage, Indiana
Eichelman Park in Kenosha, Wisconsin with Lake Michigan in the background
Eichelman Park in Kenosha, Wisconsin with Lake Michigan in the background

The National Park Service maintains the Sleeping Bear Dunes National Lakeshore and Indiana Dunes National Park. Parts of the shoreline are within the Hiawatha National Forest and the Manistee National Forest. The Manistee National Forest section of the shoreline includes the Nordhouse Dunes Wilderness. The Lake Michigan division of the Michigan Islands National Wildlife Refuge is also within the lake.

There are numerous state and local parks located on the shores of the lake or on islands within the lake:

Hydrology

Ice volcanoes form from sea ice and protect the coast from erosion.
Ice volcanoes form from sea ice and protect the coast from erosion.

The Milwaukee Reef, running under Lake Michigan from a point between Milwaukee and Racine to a point between Grand Haven and Muskegon, divides the lake into northern and southern basins. Each basin has a clockwise flow of water, deriving from rivers, winds, and the Coriolis effect. Prevailing westerly winds tend to move the surface water toward the east, producing a moderating effect on the climate of western Michigan. There is a mean difference in summer water temperatures of 5 to 10 degrees Fahrenheit (2 to 5 degrees Celsius) between the Wisconsin and Michigan shores.[28]

Hydrologically Michigan and Huron are the same body of water (sometimes called Lake Michigan-Huron) but are normally considered distinct. Counted together, it is the largest body of fresh water in the world by surface area. The Mackinac Bridge is generally considered the dividing line between them. The main inflow to Lake Michigan from Lake Superior, through Lake Huron, is controlled by the locks operated by the bi-national Lake Superior Board of Control.[31]

Historic high water The lake fluctuates from month to month with the highest lake levels in October and November. The normal high-water mark is 2.00 feet (0.61 m) above datum (577.5 ft or 176.0 m). In the summer of 1986, Lakes Michigan and Huron reached their highest level at 5.92 feet (1.80 m) above datum.[32] The high-water records were broken for several months in a row in 2020.[33]

Historic low water Lake levels tend to be the lowest in winter. The normal low-water mark is 1.00 foot (30 cm) below datum (577.5 ft or 176.0 m). In the winter of 1964, Lakes Michigan and Huron reached their lowest level at 1.38 feet (42 cm) below datum.[32] 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.[32] The all-time low-water mark was eclipsed in January 2013.[34]

In January 2013, Lake Michigan's monthly mean water levels dipped to an all-time low of 576.2 ft (175.6 m),[35] reaching their lowest ebb since record keeping began in 1918. The lakes were 29 in (0.74 m) below their long-term average and had declined 17 inches since January 2012.[36] Keith Kompoltowicz, chief of watershed hydrology for the U.S. Army Corps of Engineers' district office in Detroit, explained that biggest factors leading to the lower water levels in 2013 were a combination of the "lack of a large snowpack" in the winter of 2011/2012 coupled with very hot and dry conditions in the summer of 2012.[35] Since then water levels rebounded, rising more than 6 feet (2 meters) to historical record high levels.[37][38]

Drinking water

Lake Michigan, like the other Great Lakes, supplies drinking water to millions of people in bordering areas. The lakes are collectively administered by the state and provincial governments adjacent to them pursuant to the Great Lakes Compact. Environmental problems can still plague the lake. Steel mills and refineries operate near the Indiana shoreline. The Chicago Tribune reported that BP is a major polluter, dumping thousands of pounds of raw sludge into the lake every day from its Whiting, Indiana, oil refinery.[39] In March 2014 BP's Whiting refinery was responsible for spilling more than 1,600 US gallons (6,100 l) of oil into the lake.[40]

Fishing

Lake Michigan is home to a small variety of fish species and other organisms. It was originally home to lake whitefish, lake trout, yellow perch, panfish, largemouth bass, smallmouth bass and bowfin, as well as some species of catfish. As a result of improvements to the Welland Canal in 1918, an invasion of sea lampreys and overharvesting, there has been a decline in native lake trout populations, ultimately causing an increase in the population of another invasive species, the alewife. As a result, salmonids, including various strains of brown trout, steelhead (rainbow trout), coho and chinook salmon, were introduced as predators in order to decrease the wildlife population. This program was so successful that the introduced population of trout and salmon exploded, resulting in the creation of a large sport fishery for these introduced species. Lake Michigan is now stocked annually with steelhead, brown trout, and coho and chinook salmon, which have also begun natural reproduction in some Lake Michigan tributaries. However, several introduced invasive species, such as lampreys, round goby, zebra mussels and quagga mussels, continue to cause major changes in water clarity and fertility, resulting in knock-on changes to Lake Michigan's ecosystem, threatening the vitality of native fish populations.

Commercial fisheries

Lake fisheries postcard produced for the Milwaukee Public Museum, the backside identifies the fishermen as using a pound net.
Lake fisheries postcard produced for the Milwaukee Public Museum, the backside identifies the fishermen as using a pound net.

Fisheries in inland waters of the United States are small compared to marine fisheries. The largest fisheries are the landings from the Great Lakes, worth about $14 million in 2001.[41] Michigan's commercial fishery today consists mainly of 150 tribe-licensed commercial fishing operations through the Chippewa-Ottawa Resource Authority and tribes belonging to the Great Lakes Indian Fish and Wildlife Commission, which harvest 50 percent of the Great Lakes commercial catch in Michigan waters, and 45 state-licensed commercial fishing enterprises.[42] The prime commercial species is the lake whitefish. The annual harvest declined from an average of 11 million pounds (5,000,000 kg) from 1981 through to 1999 to more recent annual harvests of 8 to 9.5 million pounds (3,600,000 to 4,300,000 kg). The price for lake whitefish dropped from $1.04/lb. to as low as $.40/lb during periods of high production.[42]

Sports fishing

Sports fishing includes salmon, whitefish, smelt, lake trout and walleye as major catches. In the late 1960s, successful stocking programs for Pacific salmon led to the development of Lake Michigan's charter fishing industry.[43]

Shipping

Like all of the Great Lakes, Lake Michigan is today used as a major mode of transport for bulk goods. In 2002, 162 million net tons of dry bulk cargo were moved via the Lakes. This was, in order of volume: iron ore, grain and potash.[44] The iron ore and much of the stone and coal are used in the steel industry. There is also some shipping of liquid and containerized cargo, but most container vessels cannot pass the locks on the Saint Lawrence Seaway because the ships are too wide. The total amount of shipping on the lakes has been on a downward trend for several years. The Port of Chicago, operated by the Illinois International Port District, has grain (14 million bushels) and bulk liquid (800,000 barrels) storage facilities along Lake Calumet. The central element of the Port District, Calumet Harbor, is maintained by the U.S. Army Corps of Engineers.[45]

Lake Michigan beach at Holland State Park in Park Township Michigan
Lake Michigan beach at Holland State Park in Park Township Michigan

Tourism and recreation

Tourism and recreation are major industries on all of the Great Lakes. A few small cruise ships operate on Lake Michigan, including a couple of sailing ships. Many other water sports are practiced on the lakes, such as yachting, sea kayaking, diving, kitesurfing and lake surfing. Great Lakes passenger steamers have been operating since the mid-19th century. Several ferries currently operate on the Great Lakes to carry passengers to various islands, including Beaver Island and Bois Blanc Island (Michigan). Currently, two car ferry services traverse Lake Michigan from around April to November: the SS Badger, a steamer from Ludington, Michigan, to Manitowoc, Wisconsin, and the Lake Express, a high speed catamaran from Milwaukee to Muskegon, Michigan.

The Great Lakes Circle Tour, a designated scenic road system, connects all of the Great Lakes and the St. Lawrence River.[46] The lake is a great place to view ice volcanoes,[47] which typically occur at the start of the winter season.

See also

References

  1. ^ National Geophysical Data Center, 1996. Bathymetry of Lake Michigan. National Geophysical Data Center, NOAA. doi:10.7289/V5B85627 [access date: 2015-03-23].
  2. ^ National Geophysical Data Center, 1999. Bathymetry of Lake Huron. National Geophysical Data Center, NOAA. doi:10.7289/V5G15XS5 [access date: 2015-03-23]. (only small portion of this map)
  3. ^ National Geophysical Data Center, 1999. Global Land One-kilometer Base Elevation (GLOBE) v.1. Hastings, D. and P.K. Dunbar. National Geophysical Data Center, NOAA. doi:10.7289/V52R3PMS [access date: 2015-03-16].
  4. ^ "About Our Great Lakes: Tour". National Oceanic and Atmospheric Administration (NOAA), Great Lakes Environmental Research Laboratory (GLERL). Archived from the original on 2017-05-07. Retrieved December 15, 2017.
  5. ^ a b "Lake Michigan". Great-lakes.net. 2009-06-18. Archived from the original on 2010-01-01. Retrieved 2010-01-14.
  6. ^ a b c d e Wright 2006, p. 64
  7. ^ Shorelines of the Great Lakes Archived 2015-04-05 at the Wayback Machine
  8. ^ "Great Lakes Map". Michigan Department of Environmental Quality. 2013. Retrieved August 26, 2013.
  9. ^ Routley, Nick (2019-02-23). "The World's 25 Largest Lakes, Side by Side". Visual Capitalist. Retrieved 2020-12-19.
  10. ^ "Superior Watershed Partnership Projects". Archived from the original on September 28, 2007.
  11. ^ Bogue 1985, pp. 7–13
  12. ^ http://www.libs.uga.edu/darchive/hargrett/maps/1733d4.jpg
  13. ^ "Colonial Fort Michilimackinac". Mighty Mac. Retrieved 2014-07-06.
  14. ^ Bogue 1985, pp. 14–16
  15. ^ Shelak 2003, p. 3
  16. ^ Cronon, William (1991). Nature's Metropolis: Chicago and the Great West. New York, NY: W. W. Norton and Company. p. 87. ISBN 9780393072457.
  17. ^ "Variations in Sediment Accumulation Rates and the Flux of Labile Organic Matter in Eastern Lake Superior Basins". The Journal of Great Lakes Research. 1989. Archived from the original on 2012-12-03. Retrieved 2009-08-09.
  18. ^ Flesher, John (2007-09-04). "Possible mastodon carving found on rock". Associated Press. Retrieved 2008-05-25.
  19. ^ Flesher, John (2007-09-05). "Rock brings history to surface (pictures)". Associated Press. Archived from the original on 2012-09-15. Retrieved 2008-05-25.
  20. ^ Briscoe, Tony (September 16, 2018). "Lake Michigan is warming. A new report says that could mean trouble for game fish". Chicago Tribune. Retrieved 2018-09-17.
  21. ^ 05, US EPA,REG. "Geophysical Lake Michigan - US EPA". US EPA.CS1 maint: numeric names: authors list (link)
  22. ^ "Chart: 14901 Edition: 15 Edition Date: August 2006 Clear Dates: NM – 12/17/2011 LNM – 12/6/2011";"Soundings in feet and fathoms". NOAA. Retrieved September 18, 2013.
  23. ^ https://www.ngdc.noaa.gov/mgg/image/michiganlarge.jpg
  24. ^ "Bathymetry of Lake Michigan". www.ngdc.noaa.gov.
  25. ^ "Archived copy". Archived from the original on 2017-12-19. Retrieved 2018-02-03.CS1 maint: archived copy as title (link)
  26. ^ "NOAA Great Lakes Region". NOAA. Retrieved 2015-09-15.
  27. ^ "Michigan Sea Grant Coastwatch". Coastwatch.msu.edu. Archived from the original on 2010-02-12. Retrieved 2010-01-14.
  28. ^ a b Hilton 2002, pp. 3–5
  29. ^ Wolgamott, K. (2018, May 17). "Where to Find Petoskey Stones in Michigan." Retrieved from https://www.michigan.org/article/trip-idea/where-find-petoskey-stones-michigan
  30. ^ "Schedule and Fares". SS Badger. Retrieved April 1, 2018.
  31. ^ Briscoe, Tony (July 13, 2018). "What happens when Lake Superior has too much water?". Chicago Tribune. Retrieved 2018-07-15.
  32. ^ a b c Monthly bulletin of Lake Levels for The Great Lakes; September 2009; U.S. Army Corps of Engineers, Detroit District
  33. ^ "Great Lakes Water Level Data". 3 February 2021. Retrieved 9 February 2021.
  34. ^ "Great Lakes Water Level Data". 3 February 2021. Retrieved 9 February 2021.
  35. ^ a b Bivins, Larry (April 3, 2013). "Low Great Lakes water levels plague shipping, recreation". USA Today.
  36. ^ Flesher, John (5 February 2013). "Two Great Lakes hit lowest water levels since record keeping began nearly a century ago". Vancouver Sun. Archived from <ury/7923713/story.html#ixzz2RxYTXcZr the original on 12 February 2013.
  37. ^ "Lake Michigan at Near-Record High Water Levels". National Weather Service. Retrieved 9 December 2019.
  38. ^ "Great Lakes Water Level Data". 3 February 2021. Retrieved 9 February 2021.
  39. ^ Hawthorne, Michael (July 15, 2007). "BP gets break on dumping in lake". Chicago Tribune. Retrieved October 14, 2020.
  40. ^ Hawthorne, Michael (March 28, 2014). "BP raises estimate of Lake Michigan oil spill". Chicago Tribune. Retrieved October 14, 2020.
  41. ^ NOAA/NMFS: (2001) Fisheries of the United States, 2003 Archived 2007-08-10 at the Wayback Machine
  42. ^ a b Michigan Commercial Fisheries Marketing and Product Development (PDF) (Report). Ann Arbor, Michigan: University of Michigan Sea Grant. Archived from the original (PDF) on 2013-04-12. Retrieved 2013-04-30.
  43. ^ O'Keefe, Dan (2009). Charter Fishing in Michigan: A Profile of Customers and Economic Impacts (PDF) (Report). Ann Arbor, Michigan: University of Michigan Sea Grant.
  44. ^ Great Lakes Shipping Study (PDF) (Report). U.S. Department of Homeland Security. January 13, 2014.
  45. ^ U.S. Army Corps of Engineers (November 2007). "Calumet Harbor, IL and IN". Retrieved on July 31, 2014.
  46. ^ "Great Lakes Circle Tour". Great-lakes.net. 2005-07-05. Archived from the original on 2010-07-25. Retrieved 2011-02-19.
  47. ^ Ice Volcanoes Explode Along Lake Michigan as Ice Balls Line Shoreline: NWS

Further reading

Lighthouses

Wikisource has the text of an 1879 American Cyclopædia article about Lake Michigan.