Niagara Falls

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Lore & Background

Theories differ as to the origin of the name of the falls. The most common assumption is that it relates to Indigenous words for water itself. The Native American word Ongiara means thundering water; The New York Times used it as such in 1925. Fredrika Bremer supports this early attestation, claiming that Niagara is abbreviated from Oniaagarah or Ochniagarah known to First Nations Canadians as 'the thunder of waters.' Etymologies for Niagara as a place name or geographic locator have also been proposed. George R. Stewart states that it comes from the name of an Iroquois town called Onguiaahra, meaning 'point of land cut in two'. In 1847, an Iroquois interpreter stated that the name came from Jaonniaka-re, meaning 'noisy point or portage'. To Mohawks, the name refers to 'the neck', pronounced 'onyara'; the portage or neck of land between lakes Erie and Ontario onyara. The modern Seneca name is Jo'sgöhsodö', meaning 'the cliffs are standing.' Etymonline supports this, asserting that it comes from Iroquoian and meaning 'a neck', attested from 1841. Philip D. Mason wrote that the word 'Onguiaahra' appears on maps as early as 1641, and both it and the later version 'Ongiara' are Indian words generally interpreted as meaning 'The Straight', although the more romantic 'Thunder of Waters' is sometimes given. Other theories hold that the name is an ethnonym. According to Iroquoian scholar Bruce Trigger, Niagara is derived from the name given to a branch of the local native Neutral Confederacy, who are described as the Niagagarega people on several late-17th-century French maps of the area.

Reader's Guide

Niagara Falls was formed when glaciers receded at the end of the Wisconsin glaciation (the last ice age), and water from the newly formed Great Lakes carved a path over and through the Niagara Escarpment en route to the Atlantic Ocean. The features that became the falls were created by the Wisconsin glaciation about 10,000 years ago. The retreat of the ice sheet left behind a large amount of meltwater that filled up the basins that the glaciers had carved, thus creating the Great Lakes. In time, the river cut a gorge through the north-facing cliff, or cuesta. Because of the interactions of three major rock formations, the rocky bed did not erode evenly. The caprock formation is composed of hard, erosion-resistant limestone and dolomite of the Lockport Formation. That hard layer of stone eroded more slowly than the underlying materials. Immediately below the caprock lies the weaker, softer, sloping Rochester Formation, composed mainly of shale. In time, the river eroded the soft layer that supported the hard layers, undercutting the hard caprock, which gave way in great chunks. This process was repeated countless times, eventually carving out the falls. About 10,900 years ago, the Niagara Falls was between present-day Queenston, Ontario, and Lewiston, New York, but erosion of the crest caused the falls to retreat approximately 10.9 kilometres (6.8 mi) southward. The current rate of erosion is approximately 30 centimeters (12 inches) per year, down from a historical average of 1 to 1.5 m (3.3 to 4.9 ft) per year over at least the last 560 years. At this rate, in about 50,000 years Niagara Falls will have eroded the remaining 32 km (20 mi) to Lake Erie, and the falls will cease to exist. Balancing recreational, commercial, and industrial uses has been a challenge for the stewards of the falls since the 19th century. In the 1870s, sightseers had limited access to Niagara Falls and often had to pay for a glimpse, and industrialization threatened to carve up Goat Island to further expand commercial development. Other industrial encroachments and lack of public access led to a conservation movement in the U.S. known as Free Niagara, led by such notables as Hudson River School artist Frederic Edwin Church, landscape designer Frederick Law Olmsted, and architect Henry Hobson Richardson.

Did You Know?

• During peak daytime tourist hours, more than 168,000 m3 (5.9 million ft3) of water goes over the crest of the falls every minute.
• The verdant green color of the water is a byproduct of an estimated 60 tonnes/minute of dissolved salts and rock flour.
• Approximately 100,000 seagulls winter in the region, with 20,000 to 30,000 individuals spotted daily between November and January.
• The current rate of erosion is about 30 cm (12 inches) per year, down from a historical average of 1 to 1.5 m (3.3 to 4.9 ft) per year.
• The word 'Onguiaahra' appears on maps as early as 1641.

Geologic Birth from Ice

The Niagara Falls we see today are the product of a cataclysmic geological event roughly ten thousand years ago. When the massive ice sheet of the Wisconsin glaciation finally retreated, it left behind enormous volumes of meltwater that pooled in the basins the glaciers had scooped out of the bedrock. Those pools became the Great Lakes as we recognize them. The water from the upper lakes, particularly Lake Erie, found a path over and through the Niagara Escarpment on its way toward the Atlantic Ocean, and in doing so carved the gorge and the cascading drops we now call Niagara Falls. Scientists have also identified what appears to be an ancient valley—St David's Buried Gorge—now buried beneath glacial drift at roughly the location of the modern Welland Canal, hinting that the river's course has shifted over millennia. The falls sit at the southern end of Niagara Gorge, straddling the border between Ontario and New York, about seventeen miles northwest of Buffalo and forty-three miles southeast of Toronto.

Engineering the Flow

Managing the enormous volume of water that pours over Niagara Falls has been an ongoing engineering and diplomatic challenge since the nineteenth century. During peak daytime tourist hours, more than 168,000 cubic metres of water crest the falls every single minute. The International Control Dam, a weir with movable gates positioned upstream of Horseshoe Falls, diverts roughly 90 percent of the summer flow over the Canadian-side cascade while the remainder is channeled to hydroelectric facilities before reaching American Falls and Bridal Veil Falls. At night and during the quiet winter months, the flow is cut in half, never dropping below 1,400 cubic metres per second. This entire system is governed by the 1950 Niagara River Treaty and administered by the International Niagara Board of Control. The striking verdant green hue of the water is not a natural pigment but a byproduct of erosion: an estimated sixty tonnes per minute of dissolved salts and rock flour—extremely finely ground rock—suspend in the current, giving the falls their distinctive colour.

A Name with Many Voices

The origin of the word "Niagara" remains a subject of scholarly debate, with multiple Indigenous language roots proposed. The most widely repeated interpretation links it to an Iroquoian term for thundering water—Ongiara—cited as early as 1925 by the New York Times and supported by the nineteenth-century writer Fredrika Bremer, who connected it to Oniaagarah, "the thunder of waters." Other theories treat the name as a geographic descriptor: George R. Stewart traced it to Onguiaahra, meaning "point of land cut in two," while an Iroquois interpreter in 1847 offered Jaonniaka-re, "noisy point or portage." Among the Mohawks, the name refers to "the neck" (onyara), the narrow stretch of land between Lakes Erie and Ontario. The modern Seneca name, Jo'sgöhsodö', translates to "the cliffs are standing." Iroquoian scholar Bruce Trigger proposed yet another angle, suggesting the falls took their name from the Niagagarega, a branch of the Neutral Confederacy recorded on late-seventeenth-century French maps. The spelling "Onguiaahra" appears on maps dating to 1641, long before European settlers arrived to find the area occupied by the Iroquois, who had displaced the earlier Neutral inhabitants.

Power, Scale, and Living Ecosystem

Niagara Falls holds the distinction of the highest flow rate of any waterfall in North America and ranks seventh globally. Horseshoe Falls, the largest of the three cascades, stands roughly 57 metres high and stretches about 790 metres wide, while the American Falls drops between 21 and 30 metres over a 320-metre span, its height varied by giant boulders at its base. The total distance from the American extremity to the Canadian extremity spans 1,039 metres. Beyond its raw power, the falls sustain a remarkable avian community. The Niagara River is designated an important bird area, supporting Bonaparte's gulls, ring-billed gulls, and herring gulls. Around 100,000 seagulls winter in the region, and it is routine to observe 20,000 to 30,000 individuals between November and January. The river's position along migratory routes, its foraging opportunities, and its relative resistance to freezing make it an irreplaceable stopover. Balancing these ecological needs with the falls' roles as a hydroelectric source, a honeymoon destination, and a fixture in global media has been a persistent challenge for stewards since the 1800s.