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49-573: The lake was essentially an enlargement of the present Lake Ontario that formed because the St. Lawrence River downstream from the lake was blocked by the ice sheet near the present Thousand Islands . The level of the lake was approximately 30 m (~100 ft) above the present level of Lake Ontario. The lake drained to the southeast, through a channel passing near present day Rome, New York . The Rome Sand Plains has several sand ridges that geologists think were formed at this time. The channel then followed

98-768: 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

147-672: A potential trigger for the Younger Dryas episode. Two ancient shorelines in the Toronto area mark the existence of former glacial lakes. About 2 km inland from the shore, a ridge known as the Iroquois Shoreline can be discerned. The old shoreline runs west-east, running roughly parallel to Davenport Road just south of St. Clair Avenue West. Further east, the Scarborough Bluffs also formed part of

196-465: 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

245-463: 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

294-499: Is an underwater bluff. In Hamilton, Ontario the Burlington Heights represents a sand and gravel bar formed across the mouth of Cootes Paradise , at the western end of Glacial Lake Iroquois. In New York , Ridge Road and New York State Route 104 run from west to east along a ridge of the old shoreline of Lake Iroquois. Lake Ontario Lake Ontario is one of the five Great Lakes of North America. It

343-539: 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 the American city of Rochester are located on

392-903: 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

441-581: 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

490-700: 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

539-475: 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

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588-717: 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

637-716: 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

686-520: 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

735-553: 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

784-581: 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

833-463: 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,

882-608: 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

931-444: 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

980-654: 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

1029-628: 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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1078-439: 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

1127-413: 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

1176-549: 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

1225-413: 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

1274-727: 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

1323-570: 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

1372-401: 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,

1421-419: 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

1470-426: 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

1519-602: 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

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1568-399: 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

1617-472: 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

1666-786: 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

1715-481: 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

1764-459: 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 a maximum depth of 133 fathoms 4 feet (802 ft; 244 m). The lake's primary source

1813-525: 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

1862-507: 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

1911-487: 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 ,

1960-697: 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

2009-530: The shoreline of the ancient lake. In Mississauga , the shoreline is found south of Dundas Street and most visible with hills found east and west of Mavis Road. Another ancient shoreline exists between 2–4 km offshore of Toronto. It is known as the Toronto Scarp and formed the shore of Glacial Lake Warren or Admiralty Lake . From Bluffer's Park in Scarborough to just west of Hanlan's Point

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2058-404: 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

2107-477: 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

2156-699: 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 the Moses-Saunders Power Dam regulates

2205-446: 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

2254-422: The valley of the Mohawk River to the Hudson River . The lake was fed by Early Lake Erie , as well as Glacial Lake Algonquin , an early partial manifestation of Lake Huron , that drained directly to Lake Iroquois across southern Ontario , along the southern edge of the ice sheet, bypassing Early Lake Erie. The subsequent melting of the ice dam resulted in a sudden lowering of the lake to its present level,

2303-440: 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 the last lake in the Great Lakes' hydrologic chain, Lake Ontario has

2352-599: 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

2401-408: 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 ,

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