Lakes Huron and Michigan are sometimes considered a single lake, called Lake Michigan–Huron, because they are one hydrological body of water connected by the "Straits of Mackinac. The straits are 5 miles (8 km) wide and 120 feet (37 m) deep; the water levels – currently at 577 feet (176 m) – rise and fall together, and the flow between Michigan and Huron frequently reverses direction.
Other significant bodies of water
- "Lake Nipigon, connected to Lake Superior by the "Nipigon River, is surrounded by "sill-like formations of "mafic and "ultramafic "igneous rock hundreds of meters high. The lake lies in the "Nipigon Embayment, a "failed arm of the "triple junction (centered beneath Lake Superior) in the "Midcontinent Rift System event, estimated at 1,109 million years ago.
- "Green Bay is an arm of Lake Michigan, located along the south coast of the "Upper Peninsula of Michigan and the east coast of Wisconsin. It is separated from the rest of the lake by the "Door Peninsula in Wisconsin, the "Garden Peninsula in Michigan, and the chain of islands between them, all of which were formed by the "Niagara Escarpment.
- "Lake Winnebago, connected to Green Bay by the "Fox River, serves as part of the "Fox–Wisconsin Waterway and is part of a larger system of lakes in Wisconsin known as the "Winnebago Pool.
- "Grand Traverse Bay is an arm of Lake Michigan located on Michigan's west coast, being one of the largest natural harbors in the Great Lakes. The bay has one large peninsula and one major island known as Power Island. Its namesake is derived from when Jacques Marquette crossed the bay from "Norwood to "Northport calling it La Grande Traversee.
- "Georgian Bay is an arm of Lake Huron, extending northeast from the lake entirely within Ontario. The bay, along with its narrow westerly extensions of the "North Channel and "Mississagi Strait, is separated from the rest of the lake by the "Bruce Peninsula, "Manitoulin Island, and "Cockburn Island, all of which were also formed by the Niagara Escarpment.
- "Lake Nipissing, connected to Georgian Bay by the "French River, contains two "volcanic pipes, which are the "Manitou Islands and "Callander Bay. These pipes were formed by a violent, "supersonic eruption of deep-origin. The lake lies in the "Ottawa-Bonnechere Graben, a "Mesozoic "rift valley that formed 175 million years ago.
- "Lake Simcoe, connected to Georgian Bay by the "Severn River, serves as part of the "Trent–Severn Waterway, a "canal route traversing "Southern Ontario between Lakes Ontario and Huron.
- "Lake St. Clair, connected with Lake Huron (to its north) by the "St. Clair River and with Lake Erie (to its south) by the "Detroit River, is notable for the fact that Canadian territory along its southern shore (the city of "Windsor and "Essex County) lies south of the adjacent United States territory (the city of "Detroit). Although it is 17 times smaller in area than Lake Ontario and only rarely included in the listings of the Great Lakes, proposals for its official recognition as a Great Lake are occasionally made, which would affect its inclusion in scientific "research projects, etc., designated as related to "The Great Lakes".
Dispersed throughout the Great Lakes are approximately "35,000 islands. The largest among them is "Manitoulin Island in Lake Huron, the largest island in any inland body of water in the world. The second-largest island is "Isle Royale in Lake Superior. Both of these islands are large enough to contain multiple lakes themselves—for instance, Manitoulin Island's "Lake Manitou is the world's largest lake located on a freshwater island.
Shipping connection to the ocean
The "Saint Lawrence Seaway and "Great Lakes Waterway make the Great Lakes accessible to ocean-going vessels. However, shifts in shipping to wider ocean-going "container ships—which do not fit through the "locks on these routes—have limited container shipping on the lakes. Most Great Lakes trade is of bulk material, and bulk freighters of "Seawaymax-size or less can move throughout the entire lakes and out to the Atlantic. Larger ships are confined to working in the lakes themselves. Only barges can access the "Illinois Waterway system providing access to the Gulf of Mexico via the Mississippi River. Despite their vast size, large sections of the Great Lakes freeze over in winter, interrupting most shipping from January to March. Some "icebreakers ply the lakes, keeping the shipping lanes open through other periods of ice on the lakes.
The Great Lakes are also connected "by canal to the Gulf of Mexico by way of the "Illinois River (from the "Chicago River) and the Mississippi River. An alternate track is via the Illinois River (from Chicago), to the Mississippi, up the Ohio, and then through the "Tennessee–Tombigbee Waterway (a combination of a series of rivers and lakes and canals), to "Mobile Bay and the "Gulf. Commercial tug-and-barge traffic on these waterways is heavy.
Pleasure boats can also 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).
In 2009, the lakes contained 84% of the surface freshwater of North America; if the water were evenly distributed over the entire continent's land area, it would reach a depth of 1.5 meters (5 feet). The source of water levels in the lakes is tied to what was left by melting glaciers when the lakes took their present form. Annually, only about 1% is "new" water originating from rivers, precipitation, and groundwater springs that drain into the lakes. Historically, evaporation has been balanced by drainage, making the level of the lakes constant. While the lake levels have been preserved, intensive human population growth only began in the region in the 20th century and continues today. At least two human water use activities have been identified as having the potential to affect the lakes' levels: diversion (the transfer of water to other watersheds) and consumption (substantially done today by the use of lake water to power and cool electric generation plants, resulting in evaporation).
The water level of Lake Michigan–Huron had remained fairly constant over the 20th century, but has nevertheless dropped more than 6 feet from the record high in 1986 to the low of 2013. One newspaper reported that the long-term average level has gone down about 20 inches because of dredging and subsequent erosion in the "St. Clair River. Lake Michigan–Huron hit all-time record low levels in 2013; according to the "US Army Corps of Engineers, the previous record low had been set in 1964. By April 2015 the water level had recovered to 7 inches (17.5 cm) more than the "long term monthly average".
- Lake Erie
- From the "Erie tribe, a shortened form of the "Iroquoian word erielhonan (long tail).
- Lake Huron
- Named by French explorers for the inhabitants of the area, the "Wyandot or "Hurons".
- Lake Michigan
- From the "Ojibwa word mishigami (great water or large lake).
- Lake Ontario
- From the "Wyandot (Huron) word ontarío (lake of shining waters).
- Lake Superior
- English translation of the French term lac supérieur (upper lake), referring to its position north of Lake Huron. The indigenous "Ojibwe call it gichi gumi (from "Ojibwe gichi big, large, great; gumi water, lake, sea. Popularized in French-influenced transliteration as Gitchigumi as in "Gordon Lightfoot's 1976 story song, "The Wreck of the Edmund Fitzgerald, or Gitchee Gumee as in "Henry Wadsworth Longfellow's 1855 epic poem, "The Song of Hiawatha).
The Great Lakes contained 21% of the world's surface fresh water around the year 2000: 5,472 cubic miles (22,810 km3), or 6.0×1015 U.S. gallons (2.3×1016 liters). This is enough water to cover the 48 contiguous U.S. states to a uniform depth of 9.5 feet (2.9 m). Although the lakes contain a large percentage of the world's fresh water, the Great Lakes supply only a small portion of U.S. drinking water on a national basis.
The total "surface area of the lakes is approximately 94,250 square miles (244,100 km2)—nearly the same size as the "United Kingdom, and larger than the U.S. states of "New York, "New Jersey, "Connecticut, "Rhode Island, "Massachusetts, "Vermont, and "New Hampshire combined.
The Great Lakes "coast measures approximately 10,500 miles (16,900 km); however, the length of a coastline is impossible to measure exactly and is not a well-defined measure (see "Coastline paradox). Of the total 10,500 miles (16,900 km) of shoreline, Canada borders approximately 5,200 miles (8,400 km), while the remaining 5,300 miles (8,500 km) are bordered by the United States. "Michigan has the longest shoreline of the United States, bordering roughly 3,288 miles (5,292 km) of shoreline, followed by "Wisconsin (820 miles (1,320 km)), "New York (473 miles (761 km)), and "Ohio (312 miles (502 km)). Traversing the shoreline of all the lakes would cover a distance roughly equivalent to travelling half-way around the world at the "equator.
It has been estimated that the foundational geology that created the conditions shaping the present day upper Great Lakes was laid from 1.1 to 1.2 billion years ago, when two previously fused "tectonic plates split apart and created the "Midcontinent Rift, which crossed the "Great Lakes Tectonic Zone. A valley was formed providing a basin that eventually became modern day Lake Superior. When a second fault line, the "Saint Lawrence rift, formed approximately 570 million years ago, the basis for Lakes Ontario and Erie were created, along with what would become the Saint Lawrence River.
The Great Lakes are estimated to have been formed at the end of the "last glacial period (the "Wisconsin glaciation ended 10,000 to 12,000 years ago), when the "Laurentide ice sheet receded. The retreat of the ice sheet left behind a large amount of meltwater (see "Lake Algonquin and "Lake Chicago) that filled up the basins that the glaciers had carved, thus creating the Great Lakes as we know them today. Because of the uneven nature of glacier "erosion, some higher hills became "Great Lakes islands. The "Niagara Escarpment follows the contour of the Great Lakes between New York and Wisconsin. See also "Glacial Lake Iroquois and "Champlain Sea
Land below the glaciers ""rebounded" as it was uncovered. Because the glaciers covered some areas longer than others, this glacial rebound occurred at different rates.
The Great Lakes have a humid continental climate, "Köppen climate classification Dfa (in southern areas) and Dfb (in northern parts) with varying influences from air masses from other regions including dry, cold Arctic systems, mild Pacific air masses from the West, and warm, wet tropical systems from the south and the Gulf of Mexico. The lakes themselves also have a moderating effect on the climate; they can also increase precipitation totals and produce "lake effect snowfall.
The most well-known winter effect of the Great Lakes on regional weather is the "lake effect in snowfall, which is sometimes very localized. Even late in winter, the lakes often have no icepack in the middle. The prevailing winds from the west pick up the air and moisture from the lake surface, which is slightly warmer in relation to the cold surface winds above. As the slightly warmer, moist air passes over the colder land surface, the moisture often produces concentrated, heavy snowfall that sets up in bands or "streamers". This is similar to the effect of warmer air dropping snow as it passes over mountain ranges. During freezing weather with high winds, the "snow belts" receive regular snow fall from this localized weather pattern, especially along the eastern shores of the lakes. "Snow belts are found in Wisconsin, Michigan, Ohio, Pennsylvania, and New York, United States; and Ontario, Canada.
The lakes also moderate seasonal temperatures to some degree, but not with as large an influence as do large oceans; they absorb heat and cool the air in summer, then slowly radiate that heat in autumn. They protect against frost during transitional weather, and keep the summertime temperatures cooler than further inland. This effect can be very localized and overridden by offshore wind patterns. This temperature buffering produces areas known as ""fruit belts", where fruit can be produced that is typically grown much farther south. For instance, "Western Michigan has apple and cherry orchards, and vineyards cultivated adjacent to the lake shore as far north as the "Grand Traverse Bay and "Nottawasaga Bay in central Ontario. The eastern shore of Lake Michigan and the southern shore of Lake Erie have many successful wineries because of the moderating effect, as does the "Niagara Peninsula between Lake Erie and Lake Ontario. A similar phenomenon allows wineries to flourish in the "Finger Lakes region of New York, as well as in "Prince Edward County, Ontario on Lake Ontario's northeast shore. Related to the lake effect is the regular occurrence of "fog over medium-sized areas, particularly along the shorelines of the lakes. This is most noticeable along Lake Superior's shores.
The Great Lakes have been observed to help intensify storms, such as "Hurricane Hazel in 1954, and the "2011 Goderich, Ontario tornado, which moved onshore as a tornadic waterspout. In 1996 a rare tropical or subtropical storm was observed forming in Lake Huron, dubbed the "1996 Lake Huron cyclone. Rather large severe thunderstorms covering wide areas are well known in the Great Lakes during mid-summer; these "Mesoscale convective complexs or MCCs can cause damage to wide swaths of forest and shatter glass in city buildings. These storms mainly occur during the night, and the systems sometimes have small embedded tornadoes, but more often straight-line winds accompanied by intense lightning.
Historically, the Great Lakes, in addition to their "lake ecology, were surrounded by various "forest "ecoregions (except in a relatively small area of southeast Lake Michigan where savanna or prairie occasionally intruded). Logging, urbanization, and agriculture uses have changed that relationship. In the early 21st century, Lake Superior's shores are 91% forested, Lake Huron 68%, Lake Ontario 49%, Lake Michigan 41%, and Lake Erie, where logging and urbanization has been most extensive, 21%. Some of these forests are second or third growth (i.e. they have been logged before, changing their composition). At least 13 wildlife species are documented as becoming extinct since the arrival of Europeans, and many more are threatened or endangered. Meanwhile, exotic and invasive species have also been introduced.
The organisms living on the bottom of shallow waters are similar to those found in smaller lakes. The deep waters, however, contain organisms found only in deep, cold lakes of the northern latitudes. These include the delicate opossum shrimp (order "mysida), the deepwater scud (a crustacean of the order "amphipoda), two types of "copepods, and the "deepwater sculpin (a spiny, large-headed fish).
The Great Lakes are an important source of "fishing. Early European settlers were astounded by both the variety and quantity of fish; there were 150 different species in the Great Lakes. Throughout history, fish populations were the early indicator of the condition of the Lakes, and have remained one of the key indicators even in the current era of sophisticated analyses and measuring instruments. According to the bi-national (U.S. and Canadian) resource book, The Great Lakes: An Environmental Atlas and Resource Book: "The largest Great Lakes fish harvests were recorded in 1889 and 1899 at some 67,000 tonnes (66,000 long tons; 74,000 short tons) [147 million pounds]."
By 1801, the "New York Legislature found it necessary to pass regulations curtailing obstructions to the natural migrations of "Atlantic salmon from Lake Erie into their spawning channels. In the early 19th century, the government of "Upper Canada found it necessary to introduce similar legislation prohibiting the use of weirs and nets at the mouths of Lake Ontario's tributaries. Other protective legislation was passed, as well, but enforcement remained difficult.
On both sides of the Canada–United States border, the proliferation of "dams and impoundments have multiplied, necessitating more regulatory efforts. Concerns by the mid-19th century included obstructions in the rivers which prevented "salmon and "lake sturgeon from reaching their spawning grounds. The Wisconsin Fisheries Commission noted a reduction of roughly 25% in general fish harvests by 1875. The states have removed dams from rivers where necessary.["clarification needed]
Overfishing has been cited as a possible reason for a decrease in population of various "whitefish, important because of their culinary desirability and, hence, economic consequence. Moreover, between 1879 and 1899, reported whitefish harvests declined from some 24.3 million pounds (11 million kg) to just over 9 million pounds (4 million kg). By 1900, commercial fishermen on Lake Michigan were hauling in an average of 41 million pounds of fish annually. By 1938, Wisconsin's commercial fishing operations were motorized and mechanized. generating jobs for more than 2,000 workers, and hauling 14 million pounds per year. The population of giant freshwater mussels was eliminated as the mussels were harvested for use as buttons by early Great Lakes "entrepreneurs. Since 2000, the invasive "quagga mussel has smothered the bottom of Lake Michigan almost from shore to shore, and their numbers are estimated at 900 trillion.
The influx of parasitic "lamprey populations after the development of the Erie Canal and the much later "Welland Canal led to the two federal governments of the US and Canada working on joint proposals to control it. By the mid-1950s, the lake trout populations of Lakes Michigan and Huron were reduced, with the lamprey deemed largely to blame. This led to the launch of the bi-national "Great Lakes Fishery Commission.
The Great Lakes: An Environmental Atlas and Resource Book (1972) noted: "Only pockets remain of the once large commercial fishery." But, water quality improvements realized during the 1970s and 1980s, combined with successful salmonid stocking programs, have enabled the growth of a large recreational fishery. The last commercial fisherman left Milwaukee in 2011 because of overfishing and anthropogenic changes to the biosphere.
Since the 19th century an estimated 160 new species have found their way into the Great Lakes ecosystem; many have become invasive; the overseas ship ballast and ship hull parasitism are causing severe economic and ecological impacts. According to the Inland Seas Education Association, on average a new species enters the Great Lakes every eight months.
Introductions into the Great Lakes include the "zebra mussel, which was first discovered in 1988, and "quagga mussel in 1989. The "mollusks are efficient filter feeders, competing with native "mussels and reducing available food and spawning grounds for fish. In addition, the mussels may be a nuisance to industries by clogging pipes. The "U.S. Fish and Wildlife Service estimates that the economic impact of the zebra mussel could be about $5 billion over the next decade.
The "alewife first entered the system west of "Lake Ontario via 19th-century canals. By the 1960s, the small silver fish had become a familiar nuisance to beach goers across Lakes Michigan, Huron, and Erie. Periodic mass dieoffs result in vast numbers of the fish washing up on shore; estimates by various governments have placed the percentage of Lake Michigan's biomass, which was made up of alewives in the early 1960s, as high as 90%. In the late 1960s, the various state and federal governments began stocking several species of salmonids, including the native "lake trout as well as non-native chinook and coho "salmon; by the 1980s, alewife populations had dropped drastically. The "ruffe, a small "percid fish from Eurasia, became the most abundant fish species in Lake Superior's "Saint Louis River within five years of its detection in 1986. Its range, which has expanded to Lake Huron, poses a significant threat to the lower lake fishery. Five years after first being observed in the St. Clair River, the "round goby can now be found in all of the Great Lakes. The goby is considered undesirable for several reasons: it preys upon bottom-feeding fish, overruns optimal habitat, spawns multiple times a season, and can survive poor water quality conditions.
Several species of exotic "water fleas have accidentally been introduced into the Great Lakes, such as the spiny waterflea, "Bythotrephes longimanus, and the fishhook waterflea, "Cercopagis pengoi, potentially having an effect on the "zooplankton population. Several species of "crayfish have also been introduced that may contend with native crayfish populations. More recently an electric fence has been set up across the "Chicago Sanitary and Ship Canal in order to keep several species of invasive "Asian carp out of the area. These fast-growing planktivorous fish have heavily colonized the Mississippi and Illinois river systems. The "sea lamprey, which has been particularly damaging to the native "lake trout population, is another example of a marine invasive species in the Great Lakes. Invasive species, particularly zebra and quagga mussels, may be at least partially responsible for the collapse of the deepwater demersal fish community in Lake Huron, as well as drastic unprecedented changes in the zooplankton community of the lake.
Native "habitats and "ecoregions in the Great Lakes region include:
- "Eastern forest-boreal transition
- "Eastern Great Lakes lowland forests
- "Southern Great Lakes forests
- "Central forest-grasslands transition
- "Upper Midwest forest-savanna transition
- "Western Great Lakes forests
- "Central Canadian Shield forests
- "Laurentian Mixed Forest Province
- "Beech-maple forest
- "Habitats of the Indiana Dunes
Plant lists include:
"Logging of the extensive forests in the Great Lakes region removed "riparian and adjacent tree cover over rivers and streams, which provide shade, moderating water temperatures in fish spawning grounds. Removal of trees also destabilized the soil, with greater volumes washed into stream beds causing siltation of gravel beds, and more frequent flooding.
Running cut logs down the tributary rivers into the Great Lakes also dislocated sediments. In 1884, the New York Fish Commission determined that the dumping of sawmill waste (chips and sawdust) had impacted fish populations.
The first U.S. "Clean Water Act, passed by a Congressional override after being vetoed by US President "Richard Nixon in 1972, was a key piece of legislation, along with the bi-national "Great Lakes Water Quality Agreement signed by Canada and the U.S. A variety of steps taken to process industrial and municipal pollution discharges into the system greatly improved water quality by the 1980s, and Lake Erie in particular is significantly cleaner. Discharge of toxic substances has been sharply reduced. Federal and state regulations control substances like "PCBs. The first of 43 ""Great Lakes Areas of Concern" to be formally "de-listed" due to successful cleanup was Ontario's Collingwood Harbour in 1994; Ontario's Severn Sound followed in 2003. "Presque Isle Bay in Pennsylvania is formally listed as in recovery, as is Ontario's Spanish Harbour. Dozens of other Areas of Concern have received partial cleanups such as the "Rouge River (Michigan) and Waukegan Harbor (Illinois).
Until 1970, "mercury was not listed as a harmful chemical, according to the United States Federal Water Quality Administration. Within the past ten years mercury has become more apparent in water tests. Mercury compounds have been used in paper mills to prevent slime from forming during their production, and chemical companies have used mercury to separate chlorine from brine solutions. Studies conducted by the "Environmental Protection Agency have shown that when the mercury comes in contact with many of the bacteria and compounds in the fresh water, it forms the compound "methyl mercury, which has a much greater impact on human health than elemental mercury due to a higher propensity for absorption. This form of mercury is not detrimental to a majority of fish types, but is very detrimental to people and other wildlife animals who consume the fish. Mercury has been known for health related problems such as birth defects in humans and animals, and the near extinction of eagles in the Great Lakes region.
The amount of raw sewage dumped into the waters was the primary focus of both the first "Great Lakes Water Quality Agreement and federal laws passed in both countries during the 1970s. Implementation of secondary treatment of municipal sewage by major cities greatly reduced the routine discharge of untreated sewage during the 1970s and 1980s. The "International Joint Commission in 2009 summarized the change: "Since the early 1970s, the level of treatment to reduce pollution from waste water discharges to the Great Lakes has improved considerably. This is a result of significant expenditures to date on both infrastructure and technology, and robust regulatory systems that have proven to be, on the whole, quite effective." The commission reported that all urban sewage treatment systems on the U.S. side of the lakes had implemented secondary treatment, as had all on the Canadian side except for five small systems.["citation needed]
However, those treatment system upgrades have not, contrary to federal laws in both countries, yet eliminated "Combined sewer Overflow events.["citation needed] This describes when older sewerage systems, which combine storm water with sewage into single sewers heading to the treatment plant, are temporarily overwhelmed by heavy rainstorms. Local sewage treatment authorities then must release untreated effluent, a mix of rainwater and sewage, into local water bodies. While enormous public investments such as the "Deep Tunnel projects in "Chicago and "Milwaukee have greatly reduced the frequency and volume of these events, they have not been eliminated. The number of such overflow events in Ontario, for example, is flat according to the International Joint Commission. Reports about this issue on the U.S. side highlight five large municipal systems (those of "Detroit, "Cleveland, "Buffalo, "Milwaukee and "Gary) as being the largest current periodic sources of untreated discharges into the Great Lakes.
Phosphate detergents were historically a major source of nutrient to the Great Lakes algae blooms in particular in the warmer and shallower portions of the system such as "Lake Erie, "Saginaw Bay, "Green Bay, and the southernmost portion of "Lake Michigan. By the mid-1980s, most jurisdictions bordering the Great Lakes had controlled phosphate detergents, resulting in sharp reductions in the frequency and extent of the blooms.["citation needed]
In 2013, news of a garbage patch of "plastic pollution in the lakes was released.
Several Native American tribes inhabited the region since at least 1000 BC, after the end of the "Wisconsin glaciation. The peoples of the Great Lakes traded with the "Hopewell culture from around 1000 AD, as copper nuggets have been extracted from the region, and fashioned into ornaments and weapons in the mounds of Southern Ohio. The brigantine "Le Griffon, which was commissioned by "René-Robert Cavelier, Sieur de La Salle, was built at Cayuga Creek, near the southern end of the "Niagara River, and became the first known sailing ship to travel the upper Great Lakes on August 7, 1679.
The "Rush–Bagot Treaty signed in 1818, after the "War of 1812 and the later "Treaty of Washington eventually led to a complete disarmament of naval vessels in the Great Lakes. Nonetheless, both nations maintain coast guard vessels in the Great Lakes.
During settlement, the Great Lakes and its rivers were the only practical means of moving people and freight. "Barges from middle North America were able to reach the Atlantic Ocean from the Great Lakes when the Welland canal opened in 1824 and the later "Erie Canal opened in 1825. By 1848, with the opening of the "Illinois and Michigan Canal at "Chicago, direct access to the "Mississippi River was possible from the lakes. With these two canals an all-inland water route was provided between "New York City and "New Orleans.
The main business of many of the passenger lines in the 19th century was transporting "immigrants. Many of the larger cities owe their existence to their position on the lakes as a freight destination as well as for being a magnet for immigrants. After railroads and surface roads developed, the freight and passenger businesses dwindled and, except for ferries and a few foreign cruise ships, has now vanished. The immigration routes still have an effect today. Immigrants often formed their own communities and some areas have a pronounced ethnicity, such as Dutch, German, Polish, Finnish, and many others. Since many immigrants settled for a time in New England before moving westward, many areas on the U.S. side of the Great Lakes also have a New England feel, especially in home styles and accent.
Since general freight these days is transported by railroads and trucks, domestic ships mostly move bulk cargoes, such as "iron ore, "coal and "limestone for the "steel industry. The domestic bulk freight developed because of the nearby mines. It was more economical to transport the ingredients for steel to centralized plants rather than try to make steel on the spot. Grain exports are also a major cargo on the lakes.
In the 19th century and early 20th centuries, iron and other ores such as copper were shipped south on (downbound ships), and supplies, food, and coal were shipped north (upbound). Because of the location of the coal fields in Pennsylvania and "West Virginia, and the general northeast track of the "Appalachian Mountains, railroads naturally developed shipping routes that went due north to ports such as "Erie, Pennsylvania and "Ashtabula, Ohio.
Because the lake maritime community largely developed independently, it has some distinctive vocabulary. Ships, no matter the size, are called boats. When the sailing ships gave way to steamships, they were called steamboats—the same term used on the Mississippi. The ships also have a distinctive design (see "Lake freighter). Ships that primarily trade on the lakes are known as "lakers. Foreign boats are known as salties. One of the more common sights on the lakes has been since about 1950 the 1,000‑by‑105-foot (305-by-32-meter), 78,850-long-ton (80,120-metric-ton) self-unloader. This is a laker with a conveyor belt system that can unload itself by swinging a crane over the side. Today, the Great Lakes fleet is much smaller in numbers than it once was because of the increased use of overland freight, and a few larger ships replacing many small ones.
During World War II, the risk of submarine attacks against coastal training facilities motivated the United States Navy to operate two aircraft carriers on the Great Lakes, "USS Sable (IX-81) and "USS Wolverine (IX-64). Both served as training ships to qualify naval aviators in carrier landing and takeoff. "Lake Champlain briefly became the sixth Great Lake of the United States on March 6, 1998, when "President Clinton signed Senate Bill 927. This bill, which reauthorized the "National Sea Grant Program, contained a line declaring Lake Champlain to be a Great Lake. Not coincidentally, this status allows neighboring states to apply for additional federal research and education funds allocated to these national resources. Following a small uproar, the Senate voted to revoke the designation on March 24 (although New York and Vermont universities would continue to receive funds to monitor and study the lake).
In the early years of the 21st century, water levels in the Great Lakes were a concern. Researchers at the "Mowat Centre said that low levels could cost $19bn by 2050.
The Great Lakes are today used as a major "water transport corridor for bulk goods. The "Great Lakes Waterway connects all the lakes; the smaller "Saint Lawrence Seaway connects the lakes to the Atlantic oceans. Some "lake freighters are too large to use the Seaway, and only operate on the Waterway and lakes.
In 2002, 162 million net "tons of dry bulk cargo were moved on the Lakes. This was, in order of volume: iron ore, grain and "potash.["citation needed] 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 ships 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.["citation needed]
Drinking water and compact
The Great Lakes are used to supply drinking water to tens of millions of people in bordering areas. This valuable resource is collectively administered by the state and provincial governments adjacent to the lakes, who have agreed to the "Great Lakes Compact to regulate water supply and use.
Tourism and recreation are major industries on the Great Lakes. A few small cruise ships operate on the Great Lakes including a couple of "sailing ships. Sport fishing, commercial fishing, and Native American fishing represent a U.S.$4 billion a year industry with "salmon, "whitefish, "smelt, "lake trout, "bass and "walleye being major catches. Many other "water sports are practiced on the lakes such as "yachting, "sea kayaking, "diving, "kitesurfing, "powerboating, and "lake surfing.
The "Great Lakes Circle Tour is a designated scenic road system connecting all of the Great Lakes and the Saint Lawrence River.
Great Lakes passenger steamers
From 1844 through 1857, "palace steamers carried passengers and cargo around the Great Lakes. In the first half of the 20th century large luxurious passenger steamers sailed the lakes in opulence. The "Detroit and Cleveland Navigation Company had several vessels at the time and hired workers from all walks of life to help operate theses vessels. Several ferries currently operate on the Great Lakes to carry passengers to various islands, including Isle Royale, Drummond Island, "Pelee Island, "Mackinac Island, "Beaver Island, "Bois Blanc Island (Ontario), "Bois Blanc Island (Michigan), "Kelleys Island, "South Bass Island, "North Manitou Island, "South Manitou Island, "Harsens Island, "Manitoulin Island, and the "Toronto Islands. As of 2007, four car ferry services cross the Great Lakes, two on Lake Michigan: a steamer from "Ludington, Michigan, to "Manitowoc, Wisconsin, and a high speed catamaran from "Milwaukee to "Muskegon, Michigan, one on Lake Erie: a boat from "Kingsville, Ontario, or "Leamington, Ontario, to "Pelee Island, Ontario, then onto "Sandusky, Ohio, and one on Lake Huron: the M.S. Chi-Cheemaun  runs between Tobermory and South Baymouth, Manitoulin Island, operated by the Owen Sound Transportation Company. "An international ferry across Lake Ontario "Rochester, New York, to "Toronto ran during 2004 and 2005, but is no longer in operation.
The large size of the Great Lakes increases the risk of water travel; "storms and "reefs are common threats. The lakes are prone to sudden and severe storms, in particular in the autumn, from late October until early December. Hundreds of ships have met their end on the lakes. The greatest concentration of shipwrecks lies near "Thunder Bay (Michigan), beneath Lake Huron, near the point where eastbound and westbound shipping lanes converge.
The "Lake Superior shipwreck coast from "Grand Marais, Michigan, to "Whitefish Point became known as the "Graveyard of the Great Lakes". More vessels have been lost in the Whitefish Point area than any other part of Lake Superior. The "Whitefish Point Underwater Preserve serves as an underwater museum to protect the many shipwrecks in this area.
The first ship to sink in Lake Michigan was "Le Griffon, also the first ship to sail the Great Lakes. Caught in a 1679 storm while trading furs between Green Bay and Michilimacinac, it was lost with all hands aboard. Its wreck may have been found in 2004, but a wreck subsequently discovered in a different location was also claimed in 2014 to be Le Griffon.
The largest and last major freighter wrecked on the lakes was the "SS Edmund Fitzgerald, which sank on November 10, 1975, just over 17 miles (30 km) offshore from Whitefish Point on Lake Superior. The largest loss of life in a shipwreck out on the lakes may have been that of the "Lady Elgin, wrecked in 1860 with the loss of around 400 lives on Lake Michigan. In an incident at a Chicago dock in 1915, the "SS Eastland rolled over while loading passengers, killing 841.
In August 2007, the "Great Lakes Shipwreck Historical Society announced that it had found the wreckage of Cyprus, a 420-foot (130 m) long, century-old "ore carrier. Cyprus sank during a Lake Superior storm on October 11, 1907, during its second voyage while hauling iron ore from "Superior, Wisconsin, to "Buffalo, New York. The entire crew of 23 drowned, except one, a man named Charles Pitz, who floated on a life raft for almost seven hours.
In June 2008, "deep sea divers in Lake Ontario found the wreck of the 1780 "Royal Navy warship "HMS Ontario in what has been described as an "archaeological miracle". There are no plans to raise her as the site is being treated as a war grave.
In June 2010, the "L.R. Doty was found in Lake Michigan by an exploration diving team led by dive boat Captain Jitka Hanakova from her boat the Molly V. The ship sank in October 1898, probably attempting to rescue a small schooner, the Olive Jeanette, during a terrible storm. There are no plans to raise the ship as it would quickly deteriorate in open air.
Still missing are the two last warships to sink in the Great Lakes, the French minesweepers, "Inkerman and Cerisoles, which vanished in Lake Superior during a blizzard in 1918. 78 lives were lost making it the largest loss of life in Lake Superior and the greatest unexplained loss of life in the Great Lakes.
The "International Joint Commission was established in 1909 to help prevent and resolve disputes relating to the use and quality of boundary waters, and to advise Canada and the United States on questions related to water resources. Concerns over diversion of Lake water are of concern to both Americans and Canadians. Some water is diverted through the "Chicago River to operate the "Illinois Waterway but the flow is limited by treaty. Possible schemes for bottled water plants and diversion to dry regions of the continent raise concerns. Under the U.S. "Water Resources Development Act", diversion of water from the "Great Lakes Basin requires the approval of all eight Great Lakes governors through the "Great Lakes Commission, which rarely occurs. International treaties regulate large diversions. In 1998, the Canadian company Nova Group won approval from the Province of Ontario to withdraw 158,000,000 U.S. gallons (600,000 m3) of Lake Superior water annually to ship by tanker to Asian countries. Public outcry forced the company to abandon the plan before it began. Since that time, the eight Great Lakes Governors and the Premiers of Ontario and Quebec have negotiated the Great Lakes-Saint Lawrence River Basin Sustainable Water Resources Agreement and the Great Lakes-St. Lawrence River Basin Water Resources Compact that would prevent most future diversion proposals and all long-distance ones. The agreements strengthen protection against abusive water withdrawal practices within the Great Lakes basin. On December 13, 2005, the Governors and Premiers signed these two agreements, the first of which is between all ten jurisdictions. It is somewhat more detailed and protective, though its legal strength has not yet been tested in court. The second, the "Great Lakes Compact, has been approved by the state legislatures of all eight states that border the Great Lakes as well as the U.S. Congress, and was signed into law by President "George W. Bush on October 3, 2008.
The Great Lakes Restoration Initiative, described as "the largest investment in the Great Lakes in two decades," was funded at $475 million in the U.S. federal government's Fiscal Year 2011 budget, and $300 million in the Fiscal Year 2012 budget. Through the program a coalition of federal agencies is making grants to local and state entities for toxics cleanups, wetlands and coastline restoration projects, and invasive species-related projects.
Coast Guard live fire exercises
In 2006, the "United States Coast Guard (USCG) proposed a plan to designate 34 areas in the Great Lakes, at least 5 mi (8 km) offshore, as permanent safety zones for live fire machine gun practice. In August 2006, the plan was published in the "Federal Register. The USCG reserved the right to hold target practice whenever the weather allowed with a two-hour notice. These firing ranges would be open to the public when not in use. In response to requests from the public, the Coast Guard held a series of public meetings in nine U.S. cities to solicit comment. During these meetings many people voiced concerns about the plan and its impact on the environment. On December 18, 2006, the Coast Guard announced its decision to withdraw the entire proposal. Officials said they would look into alternative ammunition, modifying the proposed zones and have more public dialogue before proposing a new plan.
- "Boundary Waters Treaty of 1909
- "Eastern Continental Divide
- "Great Lakes census statistical areas
- "Great Lakes Megalopolis
- "Great Lakes Protection Fund
- "Great Lakes WATER Institute
- "Great Lakes Waterway
- "Great Recycling and Northern Development Canal
- "List of cities on the Great Lakes
- "List of municipalities on the Great Lakes
- "Michigan Islands National Wildlife Refuge
- "Northern pike
- "Populated islands of the Great Lakes
- "Sixty Years' War for control of the Great Lakes
- "Valparaiso Moraine
- "The Great Lakes Book Project
- Waples, James T. (2008). "The Laurentian Great Lakes" (PDF). North American Continental Margins. Great Lakes Environmental Research Laboratory: 73–81.
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- "Large Lakes of the World". factmonster.com.
- Great Lakes. America 2050. Retrieved on December 7, 2016.
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- Tom Bennett (February 1, 1999). State of the Great Lakes: 1997 Annual Report. DIANE Publishing. p. 1991. "ISBN "978-0-7881-4358-8.
- Likens, Gene E. (May 20, 2010). Lake Ecosystem Ecology: A Global Perspective. Academic Press. p. 326. "ISBN "978-0-12-382003-7.
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- "Great Lakes Map". Michigan Department of Environmental Quality. Archived from the original on November 27, 2011. Retrieved November 27, 2011.
- See "List of cities on the Great Lakes for a complete list.
- National Geophysical Data Center (1999). Bathymetry of Lake Erie and Lake Saint Clair. National Geophysical Data Center, NOAA. "doi:10.7289/V5KS6PHK
- National Geophysical Data Center (1999). Bathymetry of Lake Huron. National Geophysical Data Center, NOAA. "doi:10.7289/V5G15XS5
- National Geophysical Data Center (1999). Bathymetry of Lake Michigan. National Geophysical Data Center, NOAA. "doi:10.7289/V5B85627
- National Geophysical Data Center (1999). Bathymetry of Lake Ontario. National Geophysical Data Center, NOAA. "doi:10.7289/V56H4FBH
- National Geophysical Data Center (1999). Bathymetry of Lake Superior. National Geophysical Data Center, NOAA.
(the general reference to NGDC because this lake was never published, compilation of Great Lakes Bathymetry at NGDC has been suspended).
- 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
- W. Bruce Bowlus (2010). Iron Ore Transport on the Great Lakes: The Development of a Delivery System to Feed American Industry. McFarland. p. 215. "ISBN "978-0-7864-8655-7.
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- Wright, John W., ed. (2006). The New York Times Almanac (2007 ed.). New York, New York: Penguin Books. p. 64. "ISBN "0-14-303820-6.
- Home. Peninsula Township. Retrieved on December 7, 2016.
- Citation needed|May 2016
- Background Geology of the North Bay area. Retrieved on September 24, 2007
- Lake St. Clair summary report. Great Lakes.net. Retrieved on December 2, 2007.
- "Chapter 1:Introduction to Lake St. Clair and the St. Clair River". U.S. government U.S. Army. June 2004. Retrieved June 8, 2008.
- "Movement Would Thrust Greatness on Lake St. Clair", "Los Angeles Times, October 20, 2002
- Dunn, Gary A (July 1, 1996). Insects of the Great Lakes Region. "University of Michigan Press. p. 3. "ISBN "978-0-472-06515-8.
- Huber, Norman King; Geological Survey (U.S.); United States. National Park Service (1975). The geologic story of Isle Royale National Park. Department of the Interior, Geological Survey: for sale by the Superintendent of Documents, U.S. Government Printing Office. p. 41.
- Manivanan, R. (January 1, 2008). Water Quality Modeling: Rivers, Streams, and Estuaries. New India Publishing. p. 114. "ISBN "978-81-89422-93-6.
- Robert McCalla (January 1, 1994). Water Transportation in Canada. Formac Publishing Company. pp. 159–162. "ISBN "978-0-88780-247-8.
- Coastal Sediments '07. ASCE Publications. January 1, 2007. p. 2215. "ISBN "978-0-7844-7194-4. Retrieved April 16, 2013.
- United States. Bureau of the Census (1908). Transportation by water. 1906. Govt. Print. Off. p. 220.
- Great Lakes Basic Information. "United States Environmental Protection Agency
- "State of the Great Lakes 2009 Highlights (PDF)". "Environment Canada and "USEPA. pp. 7–8. Retrieved July 7, 2013.
- Bolsenga, Stanley J.; Herdendorf, Charles E. (1993). Lake Erie and Lake Saint Clair Handbook. "Wayne State University Press. p. 67. "ISBN "978-0-8143-2470-7.
- jsonline.com: Lakes Michigan, Huron hit record low water level February 5, 2013
- "Weekly Great Lakes Water Level Update"; Detroit District, Corps of Engineers, Department of the Army (April 17, 2005)
- Room, A. (2006). Placenames of the World: Origins And Meanings of the Names for 6,600 Countries, Cities, Territories, Natural Features And Historic Sites. McFarland. p. 150. "ISBN "978-0-7864-2248-7.
- Room, A. (2006). Placenames of the World: Origins And Meanings of the Names for 6,600 Countries, Cities, Territories, Natural Features And Historic Sites. McFarland. p. 171. "ISBN "978-0-7864-2248-7.
- Weiland, Matt; Wilsey, Sean (October 19, 2010). State by State. HarperCollins. p. 226. "ISBN "978-0-06-204357-3.
- Ylvisaker, Anne (2004). Lake Ontario. Capstone. p. 12. "ISBN "978-0-7368-2211-4.
- Cayton, Andrew R. L.; Sisson, Richard; Zacher, Chris (November 8, 2006). The American Midwest: An Interpretive Encyclopedia. "Indiana University Press. p. 161. "ISBN "978-0-253-00349-2.
- Taylor, William W.; Schechter, Michael G.; Wolfson, Lois G. (2007-10-25). Globalization: Effects on Fisheries Resources. Cambridge University Press. p. 85. "ISBN "978-1-139-46834-3.
- "Shorelines of the Great Lakes". Michigan Department of Environmental Quality. Retrieved July 8, 2014.
- Van Schmus, W. R.; Hinze, W. J. (May 1985). "The Midcontinent Rift System" (PDF). Annual Review of Earth and Planetary Sciences. 13 (1): 345–83. "doi:10.1146/annurev.ea.13.050185.002021. Retrieved October 6, 2008.
- Larson, Grahame; Schaetzl, R. (2001). "Origin and evolution of the Great Lakes" (PDF). Journal of Great Lakes Research. Internat. Assoc. Great Lakes Res. 27 (4): 518–546. "doi:10.1016/S0380-1330(01)70665-X. Archived from the original (PDF) on October 31, 2008. Retrieved March 4, 2009.
- "Lake levels report weighs Great Lakes basin's glacial legacy". Great Lakes Echo. June 8, 2009. Retrieved February 19, 2011.
- "Natural Processes in the Great Lakes". The Great Lakes: An Environmental Atlas and Resource Book. Environmental Protection Agency. July 24, 2008. Retrieved November 27, 2011.
- "Great Lakes Water Levels Sensitive To Climate Change". Science Daily. January 14, 2009. Retrieved April 14, 2010.
- "Glossary – NOAA's National Weather Service".
- U.S. Fish and Wildlife Service, External Affairs, 612-713-5309. "U.S. Fish and Wildlife Service – Midwest Region". fws.gov.
- Beeton, Alfred. "Great Lakes". Encyclopædia Britannica. Retrieved January 31, 2016.
- Anon (1972). The Great Lakes: An Environmental Atlas and Resource Book. Bi-national (U.S. and Canadian) resource book.
- Margaret Beattie Bogue (June 28, 2001). Fishing the Great Lakes: An Environmental History, 1783–1933. Univ of Wisconsin Press. p. 180. "ISBN "978-0-299-16763-9.
- Atlantic States Marine Fisheries Commission. Special report ... of the Atlantic States Marine Fisheries Commission. The Commission. p. 23.
- Macdonald, David and Service, Katrina, ed. (March 12, 2009). Key Topics in Conservation Biology. John Wiley & Sons. p. 188. "ISBN "978-1-4443-0906-5.
- The lake left me. It's gone., JS Online, August 13, 2011
- United States. Environmental Protection Agency (1998). EPA, Great Minds?, Great Lakes!, Lake Guardian, Don't Miss The Boat With Environmental Education, March 1997. s.n. p. 7.
- "New EPA rules to target invasive species; Invaders have plagued Great Lakes for years". The Blade. Retrieved January 25, 2009.
- "Our Threatened Great Lakes". Inland Seas Education Association. Archived from the original on April 3, 2013. Retrieved November 30, 2007.
- "Great Lakes Aquatic Nuisance Species". Great Lakes Commission. March 27, 2007. Retrieved November 30, 2007.
- Smith, Paul (February 24, 2009). "Gobies up, alewives down in Lake Michigan". Journal Sentinel. Retrieved August 6, 2010.
- "Predicting Invasive Species in the Great Lakes". U.S. Environmental Protection Agency. Retrieved August 6, 2010.
- Glassner-Shwayder, Katherine (July 2000). "Briefing Paper: Great Lakes Nonindigenous Invasive Species" (PDF). Great Lakes Nonindigenous Invasive Species Workshop. Retrieved August 6, 2010.
- "Asian Carp Risk Assessment for Canada by Fisheries and Oceans Canada" (PDF). CSAS. Retrieved August 6, 2010.
- "Petromyzon marinus Linnaeus 1758". USGS. Retrieved August 6, 2010.
- Riley, S. C.; Roseman, Edward F.; Nichols, S. Jerrine; O'Brien, Timothy P.; Kiley, Courtney S.; Schaeffer, Jeffrey S. (2008). "Deepwater demersal fish community collapse in Lake Huron" (PDF). Transactions of the American Fisheries Society. 137 (6): 1879–90. "doi:10.1577/T07-141.1. Archived from the original (PDF) on June 3, 2013.
- Barbiero, R. P.; Barbiero, Richard P.; Balcer, Mary; Rockwell, David C.; Tuchman, Marc L. (2009). "Recent shifts in the crustacean zooplankton community of Lake Huron". Canadian Journal of Fisheries and Aquatic Sciences. 66 (5): 816–828. "doi:10.1139/F09-036.
- Dempsey, Dave (April 1, 2004). On the Brink: The Great Lakes in the 21st Century. "Michigan State University Press. p. 48. "ISBN "978-0-87013-705-1.
- "Evolution of the Great Lakes Water Quality Agreement", Paul Muldoon and Lee Botts, Michigan State University Press, 2005
- Recovery of Lake Erie Walleye a Success Story. Department of Natural Resources State of Michigan, U.S. (June 8, 2006)
- "Our Great Lakes" (PDF). binational.net.
- Milestone in Waukegan Harbor PCB Cleanup. Illinois Environmental Protection Agency, U.S. (Spring 1997)
- "Mercury Spills". Idph.state.il.us. Retrieved February 19, 2011.
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- "14th Biennial Report on Great Lakes Water Quality" (PDF).
- New Report: Solving Region's Sewage Crisis Will Create Jobs, Restore Great Lakes | Healing Our Waters Coalition. Healthylakes.org (August 9, 2010). Retrieved on 2016-12-07.
- Knud-Hansen, Chris (February 1994) Historical Perspecitve Of The Phosphate Detergent Conflict. Working Paper 94-54. Colorado.edu. Retrieved on December 7, 2016.
- New Concerns About Plastic Pollution in Great Lakes 'Garbage Patch' National Geographic. April 2013.
- Woodford, Arthur M. (1991). Charting the Inland Seas: A History of the U.S. Lake Survey. Wayne State University Press. p. 4. "ISBN "978-0-8143-2499-8.
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- Wharton, George. "Great Lakes Fleet Page Vessel Feature – Burns Harbor". Boatnerd. Retrieved August 6, 2010.
- Gonzalez, Therese (2008). Great Lakes Naval Training Station. Arcadia Publishing. p. 71. "ISBN "978-0-7385-5193-7.
- Lake Champlain, The Sixth Great Lake? – Geography – 03/02/98. Geography.about.com (March 6, 1998). Retrieved on 2013-07-12.
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- Julie Bosman. "G+M: "Creeping up on unsuspecting shores: The Great Lakes" 28 Jun 2014". Theglobeandmail.com. Retrieved June 29, 2014.
- ""Great Lakes low water levels could cost $19B by 2050" 27 Jun 2014". cbc.ca. Retrieved June 29, 2014.
- Grover, Velma I.; Krantzberg, Gail (2012). Great Lakes: Lessons in Participatory Governance. CRC Press. p. 334. "ISBN "978-1-57808-769-3.
- "Great Lakes Circle Tour". Great-lakes.net. July 5, 2005. Retrieved February 19, 2011.
- Thompson, Mark L. (1991). Steamboats & Sailors of the Great Lakes. Wayne State University Press. p. 210. "ISBN "978-0-8143-2359-5.
- Strand, Kathryn Koutsky; Koutsky, Linda (2006). Minnesota Vacation Days: An Illustrated History. Minnesota Historical Society. p. 34. "ISBN "978-0-87351-526-9.
- Toast of the Town: The Life and Times of Sunnie Wilson. Wayne State University Press. 2005-05-23. p. 30. "ISBN "978-0-8143-2696-1.
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- Stonehouse, Frederick (1985, 1998). Lake Superior's Shipwreck Coast, p. 267, Avery Color Studios, Gwinn, Michigan, U.S.A. "ISBN 0-932212-43-3
- Matile, Roger (April 11, 2004) "Has a famed Great Lakes mystery been solved?" Ledger-Sentinel, "Oswego, Illinois.
- France claims historic Great Lakes wreck, Randy Boswell, Canwest News Service, February 17, 2009.
- Explorer says Griffin shipwreck may be found, Associated Press, June 24, 2014.
- "Century-old shipwreck discovered". Associated Press. September 10, 2007. Retrieved December 3, 2007.
- "Divers find 1780 British warship". BBC News. June 14, 2008. Retrieved June 15, 2008.
- "L.R. Doty, ship that sank in Lake Michigan 112 years ago, found largely intact near Milwaukee". "Star Tribune. Minneapolis-St. Paul, Minnesota,. June 24, 2010. Archived from the original on June 27, 2010. Retrieved June 28, 2010.
- "Federal Statute on Great Lakes. Water Diversions. Water Resources Development Act". Archived from the original on October 29, 2007. Retrieved October 29, 2007. . dnr.state.oh.us
- "Great Lakes—St" (PDF). Retrieved February 19, 2011.
- Agreement. Great Lakes-St Lawrence River Basin Water Resources. cglg.org. December 13, 2005
- Back to Water Conservation. www.greatlakes.org
- "Great Lakes Restoration Initiative home page".
- Jones, Meg (November 8, 2006). "Trading shots on bullets". Milwaukee Journal Sentinel. Retrieved December 2, 2007.
- Lydersen, Kari (December 19, 2006). "Coast Guard Target-Practice Plan Misfires". Washington Post. Retrieved December 2, 2007.
- Weisberg, Deborah (December 24, 2006). "Fishing: Coast Guard reloads on firing range". "Pittsburgh Post-Gazette. Retrieved December 2, 2007.
- Peter Annin (2006). The Great Lakes Water Wars. Island Press. "ISBN "978-1-61091-077-4.
- Beltran, R. et al. The Great Lakes: An Environmental Atlas and Resource Book. (United States Environmental Protection Agency and Government of Canada, 1995, "ISBN 0-662-23441-3).
- Coon, W.F. and R.A. Sheets. Estimate of Ground Water in Storage in the Great Lakes Basin [Scientific Investigations Report 2006-5180]. Department of the Interior, U.S. Geological Survey, 2006.
- Helen Hornbeck Tanner (1987). Atlas of Great Lakes Indian History. "University of Oklahoma Press. "ISBN "978-0-8061-2056-0.
- Riley, John L. (2013) The Once and Future Great Lakes Country: An Ecological History ("McGill-Queen's University Press 516 pages; traces environmental change in the region since the last ice age.
- Holling, Holling Clancy Paddle to the Sea ("ISBN 0-395-15082-5), an illustrated children's book about the Great Lakes and their environment. Beautiful and educational.
|""||Wikivoyage has a travel guide for Great Lakes.|
|""||Wikimedia Commons has media related to Great Lakes.|
- "Great Lakes". "New International Encyclopedia. 1905.
- "How the Great Lakes Were Built". "Popular Science Monthly. 49. June 1896.
- Great Lakes website of the "Canadian Department of the Environment
- Great Lakes website of the "United States Environmental Protection Agency
- Binational website of USEPA and Environment Canada for Great Lakes Water Quality
- Great Lakes Environmental Research Laboratory website (an arm of the American "National Oceanic and Atmospheric Administration)
- Great Lakes Information Network, sponsored by the Great Lakes Commission, an official American "interstate compact agency.
- Great Lakes Echo, a publication covering Great Lakes environmental issues
- Maritime History of the Great Lakes, digital library covering Great Lakes history.
Dynamically updated data