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131-415: The plant opened in 1910. Prior to this, Toronto's sewage flowed directly into Lake Ontario and a layer of thick sludge covered the lake to a distance of several hundred feet from shore. The lake was also the source of the city's drinking water and the pollution contributed to a major typhoid outbreak. The plant is located on the shore of Lake Ontario at the foot of Leslie Street at Ashbridge's Bay . To

262-768: A French spelling of the Mohawk Katarokwi . The lake was a border between the Huron people and the Iroquois Confederacy in the pre-Columbian era . In the 17th century, the Iroquois drove out the Huron from southern Ontario and settled the northern shores of Lake Ontario . When the Iroquois withdrew and the Anishnabeg / Ojibwa / Mississaugas moved in from the north to southern Ontario, they retained

393-475: A backup for treating excessive flows caused by extreme rainfall. Construction began in 2018 and is expected to be complete in 2022. The plant's outfall is the point where treated water is released and dispersed into Lake Ontario. The current outfall pipe, built in the late 1940s, will be replaced by a new larger pipe that extends further into the lake to increase capacity and improve dispersal of treated water. The new 7m-diameter outfall pipe will extend 3.5km into

524-511: A century. Combined sewers periodically release untreated wastewater into Toronto's waterways and Lake Ontario causing pollution, especially during periods of increased rainfall or snowmelt. The overall budget for the projects is $ 3 Billion CAD, representing the largest stormwater management program in Toronto's history. Since 1987, Toronto's waterfront has been identified by a Canada/US Joint International Commission as one of 43 "Areas of Concern" in

655-511: A coastline is impossible to measure exactly . Canada borders approximately 5,200 miles (8,400 km) of coastline, 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 lakes, followed by Wisconsin (820 miles (1,320 km)), New York (473 miles (761 km)), and Ohio (312 miles (502 km)). Traversing

786-533: A large watershed via many rivers and contain approximately 35,000 islands. There are also several thousand smaller lakes, often called "inland lakes", within the basin. The surface area of the five primary lakes combined is roughly equal to the size of the United Kingdom, while the surface area of the entire basin (the lakes and the land they drain) is about the size of the UK and France combined. Lake Michigan

917-991: A maximum depth of 133 fathoms 4 feet (802 ft; 244 m). The lake's primary source is the Niagara River, draining Lake Erie, with the Saint Lawrence River serving as the outlet. The drainage basin covers 24,720 square miles (64,030 km ). As with all the Great Lakes, water levels change both within the year (owing to seasonal changes in water input) and among years (owing to longer-term trends in precipitation). These water level fluctuations are an integral part of lake ecology and produce and maintain extensive wetlands. The lake also has an important freshwater fishery, although it has been negatively affected by factors including overfishing , water pollution and invasive species . Baymouth bars built by prevailing winds and currents have created

1048-405: A national basis. The total surface area of the lakes is approximately 94,250 square miles (244,100 km )—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), but the length of

1179-456: A nuisance to industries by clogging pipes. The U.S. Fish and Wildlife Service estimated in 2007 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 die-offs result in vast numbers of

1310-681: 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

1441-560: 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

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1572-489: A season, and can survive poor water quality conditions. 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 United States 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

1703-674: A second fault line, the Saint Lawrence rift , formed approximately 570 million years ago, the basis for Lakes Ontario and Erie was 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

1834-465: A significant number of lagoons and sheltered harbors, mostly near (but not limited to) Prince Edward County, Ontario , and the easternmost shores. Perhaps the best-known example is Toronto Bay , chosen as the site of the Upper Canada capital for its strategic harbor. Other prominent examples include Hamilton Harbour , Irondequoit Bay , Presqu'ile Bay , and Sodus Bay . The bars themselves are

1965-712: A single body of water, as they are joined by Straits of Mackinac .) The Great Lakes Waterway enables modern travel and shipping by water among the lakes. The lakes connect to the Atlantic Ocean via the Saint Lawrence River , and to the Mississippi River basin through the Illinois Waterway . The Great Lakes are the largest group of freshwater lakes on Earth by total area and the second-largest by total volume. They contain 21% of

2096-629: 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

2227-414: Is "new" water, originating from rivers, precipitation, and groundwater springs. In the post-glacial period, evaporation , and drainage have generally been balanced, making the levels of the lakes relatively constant. Intensive human population growth 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

2358-463: Is accompanied by the invasion of cattails , which displace many of the native plant species and reduce plant diversity. Eutrophication may accelerate this process by providing nitrogen and phosphorus for the more rapid growth of competitively dominant plants. Similar effects are occurring on the north shore, in wetlands such as Presqu'ile, which have interdunal wetlands called pannes , with high plant diversity and many unusual plant species. Most of

2489-633: 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. The fish of the Great Lakes have anti-depressant drugs meant for humans in their brains, which has caused concerns. The number of American adults who take anti-depressant drugs rose from 7.7% of all American adults in 1999–2002 to 12.7% in 2011–2014. As

2620-557: 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 ). The lakes were originally fed by both precipitation and meltwater from glaciers which are no longer present. In modern times, only about 1% of volume per year

2751-489: Is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario , and on the south and east by the U.S. state of New York . The Canada–United States border spans the centre of the lake. The Canadian cities of Hamilton , Kingston , Mississauga , and Toronto are located on the lake's northern shorelines, while the Canadian city of St. Catharines and

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2882-542: Is planned to consist of an integrated system of 22km of tunnels, 12 wet-weather-flow storage shafts, 7 off-line storage tanks, real-time sewage flow control and 27 connection points to the city's existing sewer system. The first phase, commonly referred to as the Coxwell Bypass Tunnel, is a 10.5km long, 6.3m diameter tunnel that will run in the vicinity of the Don river valley and Lakeshore Boulevard East from near

3013-581: Is the Z-shaped Bay of Quinte which separates Prince Edward County from the Ontario mainland, save for a 2-mile (3.2 km) isthmus near Trenton; this feature also supports many wetlands and aquatic plants, as well as associated fisheries. Major rivers draining into Lake Ontario include the Niagara River, Don River , Humber River , Rouge River , Trent River , Cataraqui River , Genesee River , Oswego River , Black River , Little Salmon River , and

3144-459: Is the only one of the Great Lakes that is entirely within the United States; the others form a water boundary between the United States and Canada. The lakes are divided among the jurisdictions of the Canadian province of Ontario and the U.S. states of Michigan , Wisconsin , Minnesota , Illinois , Indiana , Ohio , Pennsylvania , and New York . Both the province of Ontario and the state of Michigan include in their boundaries portions of four of

3275-700: The American Revolution with the influx of Loyalist settlers. During the War of 1812, the Royal Navy and US Navy had fought in several engagements for control of Lake Ontario . The Great Lakes, including Lake Ontario, were largely demilitarized after the Rush–Bagot Treaty was ratified in 1818. The lake became a hub of commercial activity following the War of 1812 with canal building on both sides of

3406-475: The Canadian Museum of History ), created by military engineer Jean-Baptiste de Couagne , identified Lake Ontario as "Lac Frontenac" named after Louis de Buade, Comte de Frontenac et de Palluau. He was a French soldier, courtier, and Governor General of New France from 1672 to 1682 and from 1689 to his death in 1698. In the 17th century, reports of an alleged creature named Gaasyendietha , similar to

3537-995: The Chicago Sanitary and Ship Canal to the Gulf of Mexico via 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 of Mexico. Commercial tug -and- barge traffic on these waterways

3668-821: The Door Peninsula , the Peninsulas of Michigan , and the Ontario Peninsula . Some of these peninsulas even contain smaller peninsulas, such as the Bruce , Keweenaw , Leelanau , Niagara , and Thumb peninsulas. Population centers on the peninsulas include Grand Rapids , Flint , and Detroit in Michigan along with London , Hamilton , Brantford , and Toronto in Ontario. Although the Saint Lawrence Seaway and Great Lakes Waterway make

3799-529: 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

3930-690: The Finger Lakes region of New York, as well as in Prince Edward County, Ontario , on Lake Ontario's northeast shore. 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

4061-488: The Moses-Saunders Power Dam regulates the water level of the lake. Lake Ontario is the easternmost of the Great Lakes and the smallest in surface area (7,340 sq mi, 19,000 km ), although it exceeds Lake Erie in volume (393 cu mi, 1,640 km ). It is the 13th largest lake in the world . When its islands are included, the lake's shoreline is 712 miles (1,146 km) long. As

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4192-717: The Native American peoples of the Haudenosaunee Confederacy . The National Oceanic and Atmospheric Administration 's Office of National Marine Sanctuaries and the Government of New York jointly administer the sanctuary. Lake Ontario is the site of several major commercial ports including the Port of Toronto and the Port of Hamilton . Hamilton Harbour is the location of major steel production facilities. The government of Ontario , which holds

4323-521: The Niagara Escarpment precludes all natural navigation, the four upper lakes are commonly called the "upper great lakes". This designation is not universal. Those living on the shore of Lake Superior often refer to all the other lakes as "the lower lakes", because they are farther south. Sailors of bulk freighters transferring cargoes from Lake Superior and northern Lake Michigan and Lake Huron to ports on Lake Erie or Ontario commonly refer to

4454-660: The Niagara Peninsula is a major fruit-growing and wine-making area. The wine-growing region extends over the international border into Niagara and Orleans counties in New York. Apple varieties that tolerate a more extreme climate are grown on the lake's north shore, around Cobourg . The Great Lakes watershed is a region of high biodiversity, and Lake Ontario is important for its diversity of birds, fish, reptiles, amphibians, and plants. Many of these special species are associated with shorelines, particularly sand dunes, lagoons, and wetlands. The importance of wetlands to

4585-464: The Salmon River . The lake basin was carved out of soft, weak Silurian -age rocks by the Wisconsin ice sheet during the last ice age . The action of the ice occurred along the pre-glacial Ontarian River valley which had approximately the same orientation as today's basin. Material that was pushed southward by the ice sheet left landforms such as drumlins , kames , and moraines , both on

4716-510: 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

4847-414: The zebra mussel , which was first discovered in 1988, and quagga mussel in 1989. 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 mollusks are efficient filter feeders, competing with native mussels and reducing available food and spawning grounds for fish. In addition, the mussels may be

4978-584: The " snowbelts " receive regular snow fall from this localized weather pattern, especially along the eastern shores of the lakes. Snowbelts are found in Wisconsin, Michigan, Ohio, Pennsylvania, New York, and Ontario. Related to the lake effect is the regular occurrence of fog, particularly along the shorelines of the lakes. This is most noticeable along Lake Superior's shores. The lakes tend to moderate seasonal temperatures to some degree but not with as large an influence as do large oceans; they absorb heat and cool

5109-505: The 32-mile (52-km) crossing from Niagara-on-the-Lake to Marilyn Bell Park in just under 27 hours. A large conurbation called the Golden Horseshoe occupies the lake's westernmost shores, anchored by the cities of Toronto and Hamilton. Ports on the Canadian side include St. Catharines, Oshawa, Cobourg and Kingston, near the St. Lawrence River outlet. Close to 9 million people, or over a quarter of Canada's population, live within

5240-679: The American city of Rochester are located on the south shore. In the Huron language, the name Ontarí'io means "great lake". Its primary inlet is the Niagara River from Lake Erie . The last in the Great Lakes chain, Lake Ontario serves as the outlet to the Atlantic Ocean via the Saint Lawrence River , comprising the western end of the Saint Lawrence Seaway . The Long Sault control dam , primarily along with

5371-517: The Atlantic. The shoreline created during this stage can be easily recognized by the (now dry) beaches and wave-cut hills 10 to 25 miles (16 to 40 km) from the present shoreline. When the ice finally receded from the St. Lawrence valley, the outlet was below sea level , and for a short time, the lake became a bay of the Atlantic Ocean, in association with the Champlain Sea . Gradually

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5502-568: The Canadian side, Toronto , Hamilton and Mississauga . Though the five lakes lie in separate basins, they form a single, naturally interconnected body of fresh water, within the Great Lakes Basin . As a chain of lakes and rivers, they connect the east-central interior of North America to the Atlantic Ocean. From the interior to the outlet at the Saint Lawrence River, water flows from Superior to Huron and Michigan, southward to Erie, and finally northward to Lake Ontario. The lakes drain

5633-497: The Chicago Sanitary and Ship Canal in order to keep several species of invasive Asian carp out of the lakes. These fast-growing planktivorous fish have heavily colonized the Mississippi and Illinois river systems. 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

5764-599: The DR&;CW tunnels. Construction began in 2019 and is expected to conclude in 2025. A new disinfection system using UV (ultraviolet) lights will be built south of the current plant. The new system will replace the current chlorine-based disinfection system, and will treat sewage without the use of chemicals, instead using "Next-Generation UV lamp technology" which the city claims is "more energy efficient and requires less space than conventional UV lamps." The system will include sodium hypochlorite disinfection and dechlorination as

5895-526: The Great Lakes Basin, largely due to impaired water quality and sediment conditions in the Don river watershed and Toronto's inner harbour. The DR&CW project will capture wastewater from combined sewers across the city and divert it to Ashbridges Bay Treatment Plant for treatment and discharge into Lake Ontario, diverting and virtually eliminating all discharge into the Don river, Taylor-Massey creek and Toronto harbour. At buildout, this project

6026-407: The Great Lakes accessible to ocean-going vessels, 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 within

6157-459: The Great Lakes during mid-summer; these Mesoscale convective complexes 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

6288-441: The Great Lakes each year. Plastics in the water break up into very small particles known as microplastics . Microplastics can also come from synthetic clothing washed down our drains. Plastic waste found in the lakes include single-use plastics , plastics used in packaging, takeout containers as well as pre-production pellets produced by plastics industry . High concentrations of microplastics were discovered in 100 percent of

6419-438: The Great Lakes region include: 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

6550-561: The Great Lakes. A number of self-operating floating devices called Seabin, were put in the Great Lakes to capture plastic trash as part of the Great Lakes Plastic Cleanup project. The project captured 74,000 pieces of trash using this technology between 2020 and 2021; however, it does not claim to catch up with 22 million pounds (10.0 kt) of plastic that ends up in Great Lakes every year. The production, consumption, and throwing away of plastics seems to remain

6681-463: The Iroquois name. Artifacts believed to be of Norse origin have been found in the area of Sodus Bay , indicating the possibility of trading by the indigenous peoples with Norse explorers on the east coast of North America. It is believed the first European to reach the lake was Étienne Brûlé in 1615. As was their practice, the French explorers introduced other names for the lake. In 1632 and 1656,

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6812-608: The Ottawa River in downtown Ottawa , Ontario. Several lighthouses exists throughout the lake to help with navigation. Notable historic examples include: A land-based trail that roughly follows the lake's shoreline also exists, the Great Lakes Circle Tour and Seaway Trail . The designated scenic road systems connects all of the Great Lakes and the St. Lawrence River. As the Seaway Trail is posted on

6943-509: The Straits of Mackinac. The straits are five miles (8 km) wide and 120 feet (37 m) deep; the water levels rise and fall together, and the flow between Michigan and Huron frequently reverses direction. 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

7074-582: The Taylor-Massey creek and Inner Harbour West tunnels, to be completed pending funding and regulatory approval. Ashbridges Bay Treatment Plant is currently serviced by 2 pumping stations located north of the plant across Lakeshore Blvd. on lands occupied by the Main Sewage Treatment Playground. Constructed in 1919 and the 1970s, they are planned to be replaced by a new pumping station located south of Lakeshore Blvd. within

7205-610: The Treatment Plant property. The new pumping station will receive existing flow as well as flow from the new DR&CW tunnel system, and will provide additional capacity for future population growth. Construction began in 2018 and is expected to conclude in 2026. A joint initiative between the City of Toronto and the Toronto Region Conservation Authority (TRCA), the landform project involves

7336-427: 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" through successful cleanup

7467-444: The U.S. side only, Lake Ontario is the only of the five Great Lakes to have no posted bi-national circle tour. The Lake Ontario National Marine Sanctuary covers 1,722 square miles (1,300 sq nmi; 4,460 km ) in U.S. waters in southeastern Lake Ontario. Designated on September 6, 2024, the national marine sanctuary protects historic shipwrecks and an area of great cultural, historical, and spiritual importance to

7598-591: The United States, population centres here are among the oldest in the Great Lakes basin, with Kingston, Ontario , formerly the capital of Canada , dating to the establishment of Fort Frontenac in 1673. After the French and Indian War , all forts around the lake were under British control. The United States took possession of the forts along the American side of the lake at the signing of the Jay Treaty in 1794. Permanent, non-military European settlement began during

7729-495: 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 orchards, and cherry orchards are cultivated adjacent to

7860-459: The anti-depressant drugs pass out of human bodies and through sanitation systems into the Great Lakes, this has resulted in fish in the Great Lakes with twenty times the level of anti-depressants in their brains than what is in the water, leading to the fish being exceedingly happy and hence less risk-averse, to the extent of damaging the fish populations. Researchers have found that more than 22 million pounds (10.0 kt) of plastic end up in

7991-628: The area between Oswego and Pulaski may receive twenty or more feet (600 cm) of snowfall. Also impacted by lake-effect snow is the Tug Hill Plateau , an area of elevated land about 20 miles (32 km) east of Lake Ontario. The "Hill", as it is often referred to, typically receives more snow than any other region in the eastern United States . As a result, Tug Hill is a popular location for winter enthusiasts, such as snow-mobilers and cross-country skiers. Lake-effect snow often extends inland as far as Syracuse , with that city often recording

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8122-439: The area for use in construction, particularly in the growing city of Toronto. As of 2012 , nearly 50 people have successfully swum across the lake. The first person who accomplished the feat was a Canadian long distance swimmer Marilyn Bell , who did it in 1954 at age 16. Toronto's Marilyn Bell Park is named in her honour. The park opened in 1984 and is east of the spot where Bell completed her swim. In 1974, Diana Nyad became

8253-432: The arrival of Europeans, and many more are threatened or endangered. Meanwhile, exotic and invasive species have also been introduced. While the organisms living on the bottom of shallow waters are similar to those found in smaller lakes, the deep waters 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

8384-638: The basins they had carved into the land, which then filled with meltwater. The lakes have been a major source for transportation, migration, trade, and fishing, serving as a habitat to many aquatic species in a region with much biodiversity . The surrounding region is called the Great Lakes region , which includes the Great Lakes Megalopolis . Major cities within the region include, on the American side, from east to west, Buffalo , Cleveland , Detroit , Chicago , and Milwaukee ; and, on

8515-413: The border and heavy travel by lake steamers. Steamer activity peaked in the mid-19th century before competition from railway lines. In the late 19th and early 20th centuries, a type of scow known as a stone hooker was in operation on the northwest shore, particularly around Port Credit and Bronte . Stonehooking was the practice of raking flat fragments of Dundas shale from the shallow lake floor of

8646-628: The construction of new landforms south of the plant in Ashbridges Bay using the material removed from the DR&CW tunnelling projects. The new landforms will provide improved sediment and erosion control in Ashbridges Bay, improving boat access and eliminating the need for regular dredging of the Coatsworth Cut area of the bay. Part of the reclaimed lands will also be the site of a new high-rate treatment facility, designed specifically to treat wastewater intercepted from combined sewers by

8777-427: The core of Great Lakes trash problem. Algae such as diatoms , along with other phytoplankton , are photosynthetic primary producers supporting the food web of the Great Lakes, and have been affected by global warming . The changes in the size or in the function of the primary producers may have a direct or an indirect impact on the food web. Photosynthesis carried out by diatoms constitutes about one fifth of

8908-779: The cyanobacteria ... will produce toxins", said Michael McKay, of the University of Windsor. Water quality testing was underway in August 2019. Until 1970, mercury was not listed as a harmful chemical, according to the United States Federal Water Quality Administration. In the 21st century, 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

9039-404: The eastern and northeastern shores, between the Prince Edward County headland and the lake's outlet at Kingston, underlain by the basement rock found throughout the region. However, there exist several islands in the northwestern portion of the lake. Notable islands include: The Great Lakes Waterway connects the lake sidestream to the Atlantic Ocean via the Saint Lawrence Seaway and upstream to

9170-413: The first person who swam across the lake against the current (from north to south). On August 28, 2007, 14-year-old Natalie Lambert from Kingston, Ontario, made the swim, leaving Sackets Harbor, New York, and reaching Kingston's Confederation basin less than 24 hours after she entered the lake. On August 19, 2012, 14-year-old Annaleise Carr became the youngest person to swim across the lake. She completed

9301-401: The fish that were studied by researchers from the Rochman Lab. About 50 million pounds (23 kt) of fish is harvested each year from Great Lakes which has raised concerns on how this might affect human health. Microscopic pieces of plastic have also been found in drinking water coming from Great Lakes. It is estimated that nearly 40 million people in the region rely on drinking water from

9432-443: 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 ,

9563-443: 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

9694-471: The five Great Lakes have long been called inland seas . Depending on how it is measured, by surface area, either Lake Superior or Lake Michigan–Huron is the second-largest lake in the world and the largest freshwater lake. Lake Michigan is the largest lake, by surface area, that is entirely within one country, the United States. The Great Lakes began to form at the end of the Last Glacial Period around 14,000 years ago, as retreating ice sheets exposed

9825-727: The forests around the lake are deciduous forests dominated by trees including maple, oak, beech, ash and basswood. These are classified as part of the Mixedwood Plains Ecozone by Environment Canada, or as the Eastern Great Lakes and Hudson Lowlands by the United States Environmental Protection Agency , or as the Great Lakes Ecoregion by The Nature Conservancy. Deforestation in the vicinity of

9956-570: The frost danger is past, and in the autumn delay the onset of fall frost, particularly on the south shore. Cool onshore winds also slow the early bloom of plants and flowers until later in the spring season, protecting them from possible frost damage. Such microclimatic effects have enabled tender fruit production in a continental climate, with the southwest shore supporting a major fruit-growing area. Apples , cherries , pears , plums , and peaches are grown in many commercial orchards around Rochester. Between Stoney Creek and Niagara-on-the-Lake on

10087-417: The glaciers "rebounded" as it was uncovered. Since 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

10218-410: The historical average level. Although "true tides—changes in water level caused by the gravitational forces of the sun and moon—do occur in a semi-diurnal (twice daily) pattern", such changes are quite small and generally obscured by other forces. The lake levels are affected primarily by changes in regional meteorology and climatology. The outflows from Lakes Superior and Ontario are regulated, while

10349-491: The ice sheet left behind a large amount of meltwater ( Lake Algonquin , Lake Chicago , Glacial Lake Iroquois , and Champlain Sea ) that filled up the basins that the glaciers had carved, thus creating the Great Lakes as they are 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. Land below

10480-401: The ice. The lake has completely frozen over on five recorded occasions: in 1830, 1874, 1893, 1912, and 1934. When the cold winds of winter pass over the warmer water of the lake, they pick up moisture and drop it as lake-effect snow . Since the prevailing winter winds are from the northwest, the southern and southeastern shoreline of the lake is referred to as the snowbelt . In some winters,

10611-419: The importance of maintaining and restoring forest cover, particularly along streams and wetlands. By the 1960s and 1970s, the increased pollution caused frequent algal blooms to occur in the summer. These blooms killed large numbers of fish, and left decomposing piles of filamentous algae and dead fish along the shores. Lake Ontario is the most downstream lake of the Great Lakes, so the pollution from all

10742-489: The industry. However, only recreational fishing activities exist in the 21st century. Great Lakes The Great Lakes ( French : Grands Lacs ), also called the Great Lakes of North America , are a series of large interconnected freshwater lakes spanning the Canada–United States border . The five lakes are Superior , Michigan , Huron , Erie , and Ontario . (Hydrologically, Michigan and Huron are

10873-554: 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

11004-612: The lake and causing blooms," said Michael McKay, executive director of the Great Lakes Institute for Environmental Research (GLIER) at the University of Windsor . The largest Lake Erie bloom to date occurred in 2015, exceeding the severity index at 10.5 and in 2011 at a 10. In early August 2019, satellite images depicted a bloom stretching up to 1,300 square kilometres on Lake Erie, with the heaviest concentration near Toledo, Ohio . A large bloom does not necessarily mean

11135-426: The lake area typically develops, depending on the severity of the winter. Ice sheets typically form along the shoreline and in slack water bays, where the lake is not as deep. During the winters of 1877 and 1878, the ice sheet coverage was up to 95–100% of the lake. During the War of 1812 , the ice cover was stable enough the American naval commander stationed at Sackets Harbor feared a British attack from Kingston, over

11266-602: The lake has been appreciated, and many of the larger wetlands have protected status. These wetlands are changing, partly because the natural water level fluctuations have been reduced. Many wetland plants are dependent upon low water levels to reproduce. When water levels are stabilized, the area and diversity of the marsh is reduced. This is particularly true of meadow marsh (also known as wet meadow wetlands); for example, in Eel Bay near Alexandria Bay, regulation of lake levels has resulted in large losses of wet meadow. Often this

11397-399: The lake has had many negative impacts, including loss of forest birds, extinction of native salmon, and increased amounts of sediment flowing into the lake. In some areas, more than 90 percent of the forest cover has been removed and replaced by agriculture. Certain tree species, such as hemlock, have also been particularly depleted by past logging activity. Guidelines for restoration stress

11528-650: The lake shore as far north as the Grand Traverse Bay . Near Collingwood, Ontario , commercial fruit orchards, including a few wineries, exist near the shoreline of southern Nottawasaga Bay . The eastern shore of Lake Michigan and the southern shore of Lake Erie have many successful wineries because of the lakes' moderating effects, as do the large commercial fruit and wine growing areas of the Niagara Peninsula located between Lake Erie and Lake Ontario. A similar phenomenon allows wineries to flourish in

11659-472: The lake was referred to as Lac de St. Louis or Lake St. Louis by Samuel de Champlain and cartographer Nicolas Sanson respectively. In 1660, Jesuit historian Francis Creuxius coined the name Lacus Ontarius . In a map drawn in the Relation des Jésuites (1662–1663), the lake bears the legend "Lac Ontario ou des Iroquois" with the name "Ondiara" in smaller type. A French map produced in 1712 (currently in

11790-501: The lake, and will be mined through bedrock from an on-shore vertical shaft that extends 85m into the ground. 50 underwater risers connecting to the outfall pipe will be drilled from on-water barges, and will disperse the treated and disinfected effluent into Lake Ontario. Construction began in 2018 and is expected to be complete in 2024. 43°39′29″N 79°19′14″W  /  43.658185°N 79.320431°W  / 43.658185; -79.320431 Lake Ontario Lake Ontario

11921-786: The lakebed rights of the Canadian portion of the lake under the Beds of Navigable Waters Act, does not permit wind power to be generated offshore. In Trillium Power Wind Corporation v. Ontario (Natural Resources) , the Superior Court of Justice held Trillium Power—since 2004 an "Applicant of Record" who had invested $ 35,000 in fees and, when in 2011 the Crown made a policy decision against offshore windfarms, claimed an injury of $ 2.25 billion—disclosed no reasonable cause of action. The Great Lakes once supported an industrial-scale fishery, with record hauls in 1899; overfishing later blighted

12052-538: The lakes has been observed since records began in 1918. The water level of Lake Michigan–Huron had remained fairly constant over the 20th century. Recent lake levels include record low levels in 2013 in Lakes Superior, Erie, and Michigan-Huron, followed by record high levels in 2020 in the same lakes. The water level in Lake Ontario has remained relatively constant in the same time period, hovering around

12183-470: 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). Outflows through the Chicago Sanitary and Ship Canal is more than balanced by artificial inflows via the Ogoki River and Long Lake/ Kenogami River diversions. Fluctuation of the water levels in

12314-458: The lakes. 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 connected by

12445-415: The lakes. The province of Ontario does not border Lake Michigan, and the state of Michigan does not border Lake Ontario. New York and Wisconsin's jurisdictions extend into two lakes, and each of the remaining states into one of the lakes. As the surfaces of Lakes Superior, Huron, Michigan, and Erie are all approximately the same elevation above sea level, while Lake Ontario is significantly lower, and because

12576-481: The land rebounded from the release of the weight of about 6,500 feet (2,000 m) of ice that had been stacked on it. It is still rebounding about 12 inches (30 cm) per century in the St. Lawrence area. Since the ice receded from the area last, the most rapid rebound still occurs there. This means the lake bed is gradually tilting southward, inundating the south shore and turning river valleys into bays . Both north and south shores experience shoreline erosion, but

12707-440: The last lake in the Great Lakes' hydrologic chain, Lake Ontario has the lowest mean surface elevation of the lakes at 243 feet (74 m) above sea level; 326 feet (99 m) lower than its neighbor upstream. Its maximum length is 193 statute miles (311 kilometres ; 168 nautical miles ), and its maximum width is 53 statute miles (85 km; 46 nmi). The lake's average depth is 47 fathoms 1 foot (283 ft; 86 m), with

12838-468: The latter as the lower lakes and Lakes Michigan, Huron, and Superior as the upper lakes. This corresponds to thinking of lakes Erie and Ontario as "down south" and the others as "up north". Vessels sailing north on Lake Michigan are considered "upbound" even though they are sailing toward its effluent current. Lakes Huron and Michigan are sometimes considered a single lake, called Lake Michigan–Huron, because they are one hydrological body of water connected by

12969-494: The launch of the bi-national Great Lakes Fishery Commission . 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

13100-525: The modern land surface and the lake bottom, reorganizing the region's entire drainage system. As the ice sheet retreated toward the north, it still dammed the St. Lawrence Valley outlet, so the lake surface was at a higher level. This stage is known as Lake Iroquois . During that time the lake drained through present-day Syracuse, New York , into the Mohawk River , thence to the Hudson River and

13231-507: The most winter snowfall accumulation of any large city in the United States. Other cities in the world receive more snow annually, such as Quebec City , which averages 135 inches (340 cm), and Sapporo , Japan, which receives 250 inches (640 cm) each year and is often regarded as the snowiest city in the world. Foggy conditions (particularly in fall) can be created by thermal contrasts and can be an impediment for recreational boaters. Lake breezes in spring tend to slow fruit bloom until

13362-476: 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, but enforcement remained difficult. On both sides of the Canada–United States border,

13493-421: The north end of Coxwell Avenue to Ashbridges Bay Treatment Plant. The project will also add backup capacity and allow periodic maintenance of the existing Coxwell Sanitary Trunk Sewer, a vital sewer main which currently carries approximately 75 percent of the city's wastewater to Ashbridges Bay Treatment Plant. Phase 1 construction started in 2018 and is expected to be complete by 2024. Planned future phases include

13624-467: 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

13755-487: The other lakes flows into it. Lake Ontario was ranked as the most environmentally stressed amongst the five Great Lakes in a 2015 ecological study. Some of the stresses on the lake include excess application of fertilizers in agriculture running into the lake, spillover from obsolete municipal sewage systems , toxic chemicals from industries along the rivers that drain into the lake, and metropolitan drainage from big cities like Toronto, Rochester, and Hamilton. Randle Reef ,

13886-697: The other rivers in the chain via the Welland Canal and to Lake Erie. The Trent-Severn Waterway for pleasure boats connects Lake Ontario at the Bay of Quinte to Georgian Bay (Lake Huron) via Lake Simcoe . The Oswego Canal connects the lake at Oswego to the New York State Canal System , with outlets to the Hudson River, Lake Erie, and Lake Champlain . The Rideau Canal , also for pleasure boats, connects Lake Ontario at Kingston to

14017-440: The outflows of Michigan-Huron and Erie are not regulated at all. Ontario is the most tightly regulated, with its outflow controlled by the Moses-Saunders Power Dam , which explains its consistent historical levels. The Great Lakes contain 21% of the world's surface fresh water: 5,472 cubic miles (22,810 km ), or 6.0×10 U.S. gallons, that is 6 quadrillion U.S. gallons, (2.3×10 liters). The lakes contain about 84% of

14148-516: 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. Overfishing has been cited as

14279-531: The rest in an aeration slough until autumn when agricultural applications for sludge resumed. As of 2020, the City of Toronto is undertaking several projects to prevent combined sewer overflows and improve water quality in the lower Don river, Taylor-Massey creek and Toronto harbour, with implications for Ashbridges Bay Treatment Plant. About a quarter of Toronto's current sewer system consists of combined sewers, where both raw sewage and stormwater are carried within shared pipes. Many of these sewers date back more than

14410-428: 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

14541-436: The shoreline of all the lakes would cover a distance roughly equivalent to travelling half-way around the world at the equator. A notable modern phenomenon is the formation of ice volcanoes over the lakes during wintertime. Storm-generated waves carve the lakes' ice sheet and create conical mounds through the eruption of water and slush. The process is only well-documented in the Great Lakes, and has been credited with sparing

14672-404: The sites of long beaches, such as Sandbanks Provincial Park and Sandy Island Beach State Park . These sand bars are often associated with large wetlands , which support large numbers of plant and animal species, as well as providing important rest areas for migratory birds. Presqu'ile, on the north shore of Lake Ontario, is particularly significant in this regard. One unique feature of the lake

14803-477: The so-called Loch Ness Monster , being sighted in the lake. The creature is described as large with a long neck, green in colour, and generally causes a break in the surface waves. A series of trading posts were established by both the British and French, such as Fort Frontenac in 1673, Fort Oswego in 1722, and Fort Rouillé in 1750. As the easternmost and nearest lake to the Atlantic seaboard of Canada and

14934-602: The southern shorelines from worse rocky erosion. 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

15065-414: 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 5 feet (1.5 meters). 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

15196-446: The tilting amplifies this effect on the south shore, causing loss to property owners. The lake has a natural seiche rhythm of eleven minutes. The seiche effect normally is only about 3 ⁄ 4 inch (1.9 cm) but can be greatly amplified by earth movement, winds, and atmospheric pressure changes. Because of its great depth, the lake as a whole does not completely freeze in winter, but an ice sheet covering between 10% and 90% of

15327-562: 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,

15458-532: 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 U.S. 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

15589-416: 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 . Blue-green algae, or cyanobacteria blooms, have been problematic on Lake Erie since 2011. "Not enough is being done to stop fertilizer and phosphorus from getting into

15720-538: The watershed of Lake Ontario. The American shore is largely rural, with the exception of Rochester and the much smaller ports at Oswego and Sackets Harbor. The city of Syracuse is 40 miles (64 km) inland, connected to the lake by the New York State Canal System. Over 2 million people live in Lake Ontario's American watershed. Several islands exist in the lake, the largest of which being Wolfe Island . Nearly all of Lake Ontario's islands are on

15851-559: The west is the Port Lands area, a once heavily industrial area that is now mostly deserted. To the north is the Leslieville neighbourhood. When the plant was built, it was on the eastern edge of the city, far away from most residents. It is now surrounded by residential areas and strenuous efforts have been made to reduce odours and pollution. Most notable was the shuttering of the plant's incinerators in 1987. An odour control study

15982-430: 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,

16113-427: The west, and warm, wet tropical systems from the south and the Gulf of Mexico. The lakes have a moderating effect on the climate; they can also increase precipitation totals and produce lake effect snowfall . The Great Lakes can have an effect on regional weather called lake-effect snow , which is sometimes very localized. Even late in winter, the lakes often have no icepack in the middle. The prevailing winds from

16244-408: The westernmost part of Lake Ontario, has been identified as one of the most contaminated areas on Lake Ontario alongside other areas of concern on Great Lakes . However, a $ 150-million cleanup project had begun in 2016 and is expected to be completed by 2025. The name Ontario is derived from the Huron word Ontarí'io , which means "great lake". In Colonial times, the lake was also called Cataraqui ,

16375-480: 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. Though contrary to federal laws in both countries, those treatment system upgrades have not yet eliminated combined sewer overflow events. This describes when older sewerage systems, which combine storm water with sewage into single sewers heading to

16506-472: The world's surface fresh water by volume. The total surface is 94,250 square miles (244,106 km ), and the total volume (measured at the low water datum) is 5,439 cubic miles (22,671 km ), slightly less than the volume of Lake Baikal (5,666 cu mi or 23,615 km , 22–23% of the world's surface fresh water). Because of their sea-like characteristics, such as rolling waves, sustained winds, strong currents, great depths, and distant horizons,

16637-567: 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 on a freshwater island. Some of these lakes even have their own islands, like Treasure Island in Lake Mindemoya in Manitoulin Island. The Great Lakes also have several peninsulas between them, including

16768-523: The zooplankton community of the lake. Scientists understand that the micro-aquatic life of the lakes is abundant but know very little about some of the most plentiful microbes and their environmental effects in the Great Lakes. Although a drop of lake water may contain 1 million bacteria cells and 10 million viruses , only since 2012 has there been a long-term study of the lakes' micro-organisms. Between 2012 and 2019 more than 160 new species have been discovered. Native habitats and ecoregions in

16899-558: 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). Phosphate detergents were historically a major source of nutrient to the Great Lakes algae blooms in particular in

17030-420: Was completed in 2002 and, beginning in 2002, the area around the plant was also redesigned into a large landscaped park. In 2005, a contract was awarded to design and construct a new odour control system. Until recently, all the sludge has been trucked off site. However, summer 2007 saw odour problems, with the Michigan landfill closed and the city removing only 6 of every 10 truckloads of sludge produced, leaving

17161-517: Was eliminated as the mussels were harvested for use as buttons by early Great Lakes entrepreneurs. The Great Lakes: An Environmental Atlas and Resource Book (1972) notes: "Only pockets remain of the once large commercial fishery." 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

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