117-482: A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road. Typically a viaduct connects two points of roughly equal elevation, allowing direct overpass across a wide valley, road, river, or other low-lying terrain features and obstacles. The term viaduct is derived from the Latin via meaning "road", and ducere meaning "to lead". It
234-600: A bridge-restaurant which is a bridge built to serve as a restaurant. Other suspension bridge towers carry transmission antennas. Conservationists use wildlife overpasses to reduce habitat fragmentation and animal-vehicle collisions. The first animal bridges sprung up in France in the 1950s, and these types of bridges are now used worldwide to protect both large and small wildlife. Bridges are subject to unplanned uses as well. The areas underneath some bridges have become makeshift shelters and homes to homeless people, and
351-525: A bridge is to be designed, standards authorities specify simplified notional load models, notably HL-93, intended to give the same load effects as the characteristic maximum values. The Eurocode is an example of a standard for bridge traffic loading that was developed in this way. Most bridge standards are only applicable for short and medium spans - for example, the Eurocode is only applicable for loaded lengths up to 200 m. Longer spans are dealt with on
468-755: A capital. In 1787, the British Lord Dorchester arranged for the Toronto Purchase with the Mississaugas of the New Credit First Nation, thereby securing more than a quarter of a million acres (1000 km ) of land in the Toronto area. Dorchester intended the location to be named Toronto. The first 25 years after the Toronto purchase were quiet, although "there were occasional independent fur traders" present in
585-471: A case-by-case basis. It is generally accepted that the intensity of load reduces as span increases because the probability of many trucks being closely spaced and extremely heavy reduces as the number of trucks involved increases. It is also generally assumed that short spans are governed by a small number of trucks traveling at high speed, with an allowance for dynamics. Longer spans on the other hand, are governed by congested traffic and no allowance for dynamics
702-657: A channel to the harbour. The peninsula was formed by longshore drift taking the sediments deposited along the Scarborough Bluffs shore and transporting them to the Islands area. The other source of sediment for the Port Lands wetland and the peninsula was the deposition of the Don River, which carved a wide valley through the sedimentary land of Toronto and deposited it in the shallow harbour. The harbour and
819-480: A combination of structural health monitoring and testing. This is regulated in country-specific engineer standards and includes an ongoing monitoring every three to six months, a simple test or inspection every two to three years and a major inspection every six to ten years. In Europe, the cost of maintenance is considerable and is higher in some countries than spending on new bridges. The lifetime of welded steel bridges can be significantly extended by aftertreatment of
936-399: A different site, and re-used. They are important in military engineering and are also used to carry traffic while an old bridge is being rebuilt. Movable bridges are designed to move out of the way of boats or other kinds of traffic, which would otherwise be too tall to fit. These are generally electrically powered. The Tank bridge transporter (TBT) has the same cross-country performance as
1053-606: A few will predominate. The separation of forces and moments may be quite clear. In a suspension or cable-stayed bridge , the elements in tension are distinct in shape and placement. In other cases the forces may be distributed among a large number of members, as in a truss. The world's longest beam bridge is Lake Pontchartrain Causeway in southern Louisiana in the United States, at 23.83 miles (38.35 km), with individual spans of 56 feet (17 m). Beam bridges are
1170-541: A landscape, usually by bridging a river valley or other eroded opening in an otherwise flat area. Often such valleys had roads descending either side (with a small bridge over the river, where necessary) that become inadequate for the traffic load, necessitating a viaduct for "through" traffic. Such bridges also lend themselves for use by rail traffic, which requires straighter and flatter routes. Some viaducts have more than one deck, such that one deck has vehicular traffic and another deck carries rail traffic. One example of this
1287-594: A ravine or valley and continue on the other side. Toronto has many bridges spanning the ravines. Large bridges such as the Prince Edward Viaduct were built to span broad river valleys. Despite its deep ravines, Toronto is not remarkably hilly, but its elevation does increase steadily away from the lake. Elevation differences range from 76.5 metres (251 ft) above sea level at the Lake Ontario shore to 209 m (686 ft) above sea level near
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#17327725842591404-607: A repurposed rail viaduct provides a garden promenade on top and workspace for artisans below. The garden promenade is called the Coulée verte René-Dumont while the workspaces in the arches below are the Viaduc des Arts . The project was inaugurated in 1993. Manhattan's High Line , inaugurated in 2009, also uses an elevated train line as a linear urban park . In Indonesia viaducts are used for railways in Java and also for highways such as
1521-561: A simple type of suspension bridge , were used by the Inca civilization in the Andes mountains of South America, just prior to European colonization in the 16th century. The Ashanti built bridges over streams and rivers . They were constructed by pounding four large forked tree trunks into the stream bed, placing beams along these forked pillars, then positioning cross-beams that were finally covered with four to six inches of dirt. During
1638-593: A span of 552 m (1,811 ft). The bridge was opened 29 April 2009, in Chongqing , China. The longest suspension bridge in the world is the 4,608 m (15,118 ft) 1915 Çanakkale Bridge in Turkey. The longest cable-stayed bridge since 2012 is the 1,104 m (3,622 ft) Russky Bridge in Vladivostok , Russia. Some Engineers sub-divide 'beam' bridges into slab, beam-and-slab and box girder on
1755-749: A stream. Often in palaces, a bridge will be built over an artificial waterway as symbolic of a passage to an important place or state of mind. A set of five bridges cross a sinuous waterway in an important courtyard of the Forbidden City in Beijing, China. The central bridge was reserved exclusively for the use of the Emperor and Empress, with their attendants. The estimated life of bridges varies between 25 and 80 years depending on location and material. Bridges may age hundred years with proper maintenance and rehabilitation. Bridge maintenance consisting of
1872-489: A tank even when fully loaded. It can deploy, drop off and load bridges independently, but it cannot recover them. Double-decked (or double-decker) bridges have two levels, such as the George Washington Bridge , connecting New York City to Bergen County , New Jersey , US, as the world's busiest bridge, carrying 102 million vehicles annually; truss work between the roadway levels provided stiffness to
1989-625: Is a 19th-century derivation from an analogy with ancient Roman aqueducts . Like the Roman aqueducts , many early viaducts comprised a series of arches of roughly equal length. The longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France. At its longest point, it measured 2,679 meters with a width of 22 meters. Viaducts are commonly used in many cities that are railroad hubs , such as Chicago, Birmingham, London and Manchester . These viaducts cross
2106-462: Is a bridge that carries water, resembling a viaduct, which is a bridge that connects points of equal height. A road-rail bridge carries both road and rail traffic. Overway is a term for a bridge that separates incompatible intersecting traffic, especially road and rail. Some bridges accommodate other purposes, such as the tower of Nový Most Bridge in Bratislava , which features a restaurant, or
2223-454: Is a prominent centre for music, theatre, motion picture production, and television production, and is home to the headquarters of Canada's major national broadcast networks and media outlets . Its varied cultural institutions , which include numerous museums and galleries , festivals and public events , entertainment districts, national historic sites , and sports activities , attract over 43 million tourists each year. Toronto
2340-588: Is an early example of a double-decked bridge. The upper level carries a railway, and the lower level is used for road traffic. Other examples include Britannia Bridge over the Menai Strait and Craigavon Bridge in Derry, Northern Ireland. The Oresund Bridge between Copenhagen and Malmö consists of a four-lane highway on the upper level and a pair of railway tracks at the lower level. Tower Bridge in London
2457-506: Is built across land rather than water, the space below the arches may be used for businesses such as car parking, vehicle repairs, light industry, bars and nightclubs. In the United Kingdom, many railway lines in urban areas have been constructed on viaducts, and so the infrastructure owner Network Rail has an extensive property portfolio in arches under viaducts. In Berlin the space under the arches of elevated subway lines ( S-Bahn )
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#17327725842592574-496: Is different example of a double-decked bridge, with the central section consisting of a low-level bascule span and a high-level footbridge . A viaduct is made up of multiple bridges connected into one longer structure. The longest and some of the highest bridges are viaducts, such as the Lake Pontchartrain Causeway and Millau Viaduct . A multi-way bridge has three or more separate spans which meet near
2691-517: Is its escarpments. During the last ice age , the lower part of Toronto was beneath Glacial Lake Iroquois . Today, a series of escarpments mark the lake's former boundary, known as the "Iroquois Shoreline". The escarpments are most prominent from Victoria Park Avenue to the mouth of Highland Creek , where they form the Scarborough Bluffs . Other observable sections include the area near St. Clair Avenue West between Bathurst Street and
2808-675: Is known for its many skyscrapers and high-rise buildings , in particular the CN Tower , the tallest freestanding structure on land outside of Asia. The city is home to the Toronto Stock Exchange , the headquarters of Canada's five largest banks , and the headquarters of many large Canadian and multinational corporations. Its economy is highly diversified with strengths in technology, design, financial services, life sciences, education, arts, fashion, aerospace, environmental innovation, food services, and tourism. Toronto
2925-417: Is led by architects, bridges are usually designed by engineers. This follows from the importance of the engineering requirements; namely spanning the obstacle and having the durability to survive, with minimal maintenance, in an aggressive outdoor environment. Bridges are first analysed; the bending moment and shear force distributions are calculated due to the applied loads. For this, the finite element method
3042-540: Is needed. Calculating the loading due to congested traffic remains a challenge as there is a paucity of data on inter-vehicle gaps, both within-lane and inter-lane, in congested conditions. Weigh-in-Motion (WIM) systems provide data on inter-vehicle gaps but only operate well in free flowing traffic conditions. Some authors have used cameras to measure gaps and vehicle lengths in jammed situations and have inferred weights from lengths using WIM data. Others have used microsimulation to generate typical clusters of vehicles on
3159-588: Is now a museum. The pre-amalgamation City of Toronto covers the downtown core and older neighbourhoods to the east, west, and north. It is the most densely populated part of the city. The Financial District contains the First Canadian Place , Toronto-Dominion Centre , Scotia Plaza , Royal Bank Plaza , Commerce Court and Brookfield Place . This area includes, among others, the neighbourhoods of St. James Town , Garden District , St. Lawrence , Corktown , and Church and Wellesley . From that point,
3276-728: Is the Prince Edward Viaduct in Toronto, Canada, that carries motor traffic on the top deck as Bloor Street , and metro as the Bloor-Danforth subway line on the lower deck, over the steep Don River valley . Others were built to span settled areas, crossing over roads beneath—the reason for many viaducts in London. Viaducts over water make use of islands or successive arches. They are often combined with other types of bridges or tunnels to cross navigable waters as viaduct sections, while less expensive to design and build than tunnels or bridges with larger spans, typically lack sufficient horizontal and vertical clearance for large ships. See
3393-737: Is the most popular. The analysis can be one-, two-, or three-dimensional. For the majority of bridges, a two-dimensional plate model (often with stiffening beams) is sufficient or an upstand finite element model. On completion of the analysis, the bridge is designed to resist the applied bending moments and shear forces, section sizes are selected with sufficient capacity to resist the stresses. Many bridges are made of prestressed concrete which has good durability properties, either by pre-tensioning of beams prior to installation or post-tensioning on site. In most countries, bridges, like other structures, are designed according to Load and Resistance Factor Design (LRFD) principles. In simple terms, this means that
3510-577: Is the third-largest tech hub in North America after Silicon Valley and New York City , and the fastest-growing hub. The word Toronto has been recorded with various spellings in French and English, including Tarento , Tarontha , Taronto , Toranto , Torento , Toronto , and Toronton . The most frequent early spelling, Taronto , referred to 'The Narrows', a channel of water through which Lake Simcoe discharges into Lake Couchiching where
3627-405: Is used for several different purposes, including small eateries or bars. Elevated expressways were built in major cities such as Boston ( Central Artery ), Los Angeles, San Francisco, Seoul , Tokyo and Toronto ( Gardiner Expressway ). Some were demolished because they were unappealing and divided the city. In other cases, viaducts were demolished because they were structurally unsafe, such as
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3744-400: The 2026 FIFA World Cup . Toronto covers an area of 630 square kilometres (243 sq mi), with a maximum north–south distance of 21 kilometres (13 mi). It has a maximum east–west distance of 43 km (27 mi), and it has a 46-kilometre (29 mi) long waterfront shoreline, on the northwestern shore of Lake Ontario . The Toronto Islands and Port Lands extend out into
3861-540: The Chesapeake Bay Bridge-Tunnel . The Millau Viaduct is a cable-stayed road-bridge that spans the valley of the river Tarn near Millau in southern France. It opened in 2004 and is the tallest vehicular bridge in the world, with one pier's summit at 343 metres (1,125 ft). The viaduct Danyang–Kunshan Grand Bridge in China was the longest bridge in the world as of 2011. Where a viaduct
3978-644: The Embarcadero Freeway in San Francisco, which was damaged by an earthquake in 1989. However, in developing nations such as Thailand ( Bang Na Expressway , the world's longest road bridge ), India ( Delhi-Gurgaon Expressway ), China, Bangladesh, Pakistan, and Nicaragua, elevated expressways have been built and more are under construction to improve traffic flow, particularly as a workaround of land shortage when built atop surface roads. Other uses have been found for some viaducts. In Paris, France,
4095-589: The Great Irish Famine ; most of them were Catholic . By 1851, the Irish-born population had become the largest single ethnic group in the city. The Scottish and English population welcomed smaller numbers of Protestant Irish immigrants, some from what is now Northern Ireland, which gave the Orange Order significant and long-lasting influence over Toronto society. Almost every mayor of Toronto
4212-516: The Greater Toronto Area proper had a 2021 population of 6,712,341. Toronto is an international centre of business, finance, arts, sports, and culture and is one of the most multicultural and cosmopolitan cities in the world. Indigenous peoples have travelled through and inhabited the Toronto area, located on a broad sloping plateau interspersed with rivers, deep ravines, and urban forest , for more than 10,000 years. After
4329-642: The Hellenistic era can be found in the Peloponnese. The greatest bridge builders of antiquity were the ancient Romans . The Romans built arch bridges and aqueducts that could stand in conditions that would damage or destroy earlier designs, some of which still stand today. An example is the Alcántara Bridge , built over the river Tagus , in Spain. The Romans also used cement, which reduced
4446-623: The Jakarta Inner Ring Road . In January 2019, the Alaskan Way Viaduct in Seattle was closed and replaced with a tunnel after several decades of use because it was seismically unsafe. Bridge A bridge is a structure built to span a physical obstacle (such as a body of water , valley , road, or railway) without blocking the path underneath. It is constructed for the purpose of providing passage over
4563-645: The Mississaugas had displaced the Iroquois, who abandoned the Toronto area at the end of the Beaver Wars , with most returning to their homeland in present-day New York state. French traders founded Fort Rouillé in 1750 (the current Exhibition grounds were later developed there), but abandoned it in 1759 during the Seven Years' War . The British defeated the French and their indigenous allies in
4680-482: The Toronto Carrying-Place Trail , led to widespread use of the name. The pronunciation of the city is broadly / t ə ˈ r ɒ n t oʊ / tə- RONT -oh , which locals pronounce [təˈɹɒnoʊ] or [ˈtɹɒnoʊ] , leaving the second 't' silent. The site of Toronto lay at the entrance to one of the oldest routes to the northwest, a route known and used by
4797-792: The University of Minnesota ). Likewise, in Toronto , the Prince Edward Viaduct has five lanes of motor traffic, bicycle lanes, and sidewalks on its upper deck; and a pair of tracks for the Bloor–Danforth subway line on its lower deck. The western span of the San Francisco–Oakland Bay Bridge also has two levels. Robert Stephenson 's High Level Bridge across the River Tyne in Newcastle upon Tyne , completed in 1849,
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4914-602: The York University grounds in the city's north end at the intersection of Keele Street and Steeles Avenue. There are occasional hilly areas; in particular, midtown Toronto , as well as the Silverthorn and Fairbank neighbourhoods, have several sharply sloping hills. Lake Ontario remains occasionally visible from the peaks of these ridges as far north as Eglinton Avenue, 7 to 8 kilometres (4.3 to 5.0 mi) inland. The other major geographical feature of Toronto
5031-504: The river Severn . With the Industrial Revolution in the 19th century, truss systems of wrought iron were developed for larger bridges, but iron does not have the tensile strength to support large loads. With the advent of steel, which has a high tensile strength, much larger bridges were built, many using the ideas of Gustave Eiffel . In Canada and the United States, numerous timber covered bridges were built in
5148-527: The 13th century BC, in the Peloponnese is one of the oldest arch bridges in existence and use. The Oxford English Dictionary traces the origin of the word bridge to an Old English word brycg , of the same meaning. The Oxford English Dictionary also notes that there is some suggestion that the word can be traced directly back to Proto-Indo-European *bʰrēw-. However, they also note that "this poses semantic problems." The origin of
5265-523: The 18th century, there were many innovations in the design of timber bridges by Hans Ulrich Grubenmann , Johannes Grubenmann , as well as others. The first book on bridge engineering was written by Hubert Gautier in 1716. A major breakthrough in bridge technology came with the erection of the Iron Bridge in Shropshire, England in 1779. It used cast iron for the first time as arches to cross
5382-556: The 19th century, the city built an extensive sewage system to improve sanitation, and streets were illuminated with gas lighting as a regular service. Long-distance railway lines were constructed, including a route completed in 1854 linking Toronto with the Upper Great Lakes. The Grand Trunk Railway and the Northern Railway of Canada joined in the building of the first Union Station in downtown. The advent of
5499-578: The City of Toronto in 1834. Toronto hosted the 4th G20 summit during June 26–27, 2010. This included the largest security operation in Canadian history. Following large-scale protests and rioting, law enforcement arrested more than 1,000 people, the largest mass arrest in Canadian history. On July 8, 2013, severe flash flooding hit Toronto after an afternoon of slow-moving, intense thunderstorms. Toronto Hydro estimated 450,000 people were without power after
5616-487: The Don River, and north of Davenport Road from Caledonia to Spadina Road ; the Casa Loma grounds sit above this escarpment. The geography of the lakeshore has dramatically changed since the first settlement of Toronto. Much of the land on the harbour's north shore is landfill, filled in during the late 19th century. Until then, the lakefront docks (then known as wharves) were set back farther inland than today. Much of
5733-729: The Huron had planted tree saplings to corral fish. This narrows was called tkaronto by the Mohawk , meaning 'where there are trees standing in the water', and was recorded as early as 1615 by Samuel de Champlain . The word Toronto , meaning 'plenty', also appears in a 1632 French lexicon of the Huron language , which is also an Iroquoian language. It also appears on French maps referring to various locations, including Georgian Bay, Lake Simcoe, and several rivers. A portage route from Lake Ontario to Lake Huron running through this point, known as
5850-593: The Huron, Iroquois, and Ojibwe . Archaeological sites show evidence of human occupation dating back thousands of years. The site was of strategic importance from the beginning of Ontario's recorded history. In the 1660s, the Iroquois established two villages within what is today Toronto, Ganatsekwyagon (Bead Hill) on the banks of the Rouge River and Teiaiagon on the banks of the Humber River . By 1701,
5967-695: The Progressive Conservatives' majority. North York mayor Mel Lastman became the first "megacity" mayor, and the 62nd mayor of Toronto, with his electoral victory . Lastman gained national attention after multiple snowstorms, including the January Blizzard of 1999 , dumped 118 centimetres (46 in) of snow and effectively immobilized the city. He called in the Canadian Army to aid snow removal by use of their equipment to augment police and emergency services. The move
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#17327725842596084-677: The Toronto Harbour), and the Rouge River at the city's eastern limits. Most of the ravines and valley lands in Toronto today are parklands and recreational trails are laid out along the ravines and valleys. The original town was laid out in a grid plan on the flat plain north of the harbour, and this plan was extended outwards as the city grew. The width and depth of several of the ravines and valleys are such that several grid streets, such as Finch Avenue , Leslie Street , Lawrence Avenue , and St. Clair Avenue , terminate on one side of
6201-622: The Toronto skyline extends northward along Yonge Street. Old Toronto is also home to many historically wealthy residential enclaves, such as Yorkville , Rosedale, The Annex, Forest Hill, Lawrence Park , Lytton Park , Deer Park , Moore Park , and Casa Loma, most stretching away from downtown to the north. East and west of downtown, neighbourhoods such as Kensington Market , Chinatown , Leslieville , Cabbagetown and Riverdale are home to bustling commercial and cultural areas as well as communities of artists with studio lofts, with many middle- and upper-class professionals. Other neighbourhoods in
6318-681: The West. Like the Irish before them, many of these migrants lived in overcrowded shanty-type slums, such as " the Ward ", which was centred on Bay Street , now the heart of the country's Financial District . As new migrants began to prosper, they moved to better housing in other areas, in what is now understood to be succession waves of settlement. Despite its fast-paced growth, by the 1920s, Toronto's population and economic importance in Canada remained second to
6435-466: The adjacent Port Lands on the harbour's east side was a wetland filled in early in the 20th century. The shoreline from the harbour west to the Humber River has been extended into the lake. Further west, landfill has been used to create extensions of land such as Humber Bay Park. The Toronto Islands were a natural peninsula until a storm in 1858 severed their connection to the mainland, creating
6552-624: The appearance of the bridge can have great importance. Often, this is the case with a large bridge that serves as an entrance to a city, or crosses over a main harbor entrance. These are sometimes known as signature bridges. Designers of bridges in parks and along parkways often place more importance on aesthetics, as well. Examples include the stone-faced bridges along the Taconic State Parkway in New York. Bridges are typically more aesthetically pleasing if they are simple in shape,
6669-405: The architecture of its homes, and for being one of Toronto's earliest planned communities, was designated as an Ontario Heritage Conservation district in 1985. The Casa Loma neighbourhood is named after "Casa Loma", a castle built in 1911 by Sir Henry Pellat , complete with gardens, turrets, stables, an elevator, secret passages, and a bowling alley. Spadina House is a 19th-century manor that
6786-484: The area, with the usual complaints of debauchery and drunkenness. In 1793, Governor John Graves Simcoe established the town of York on the Toronto Purchase lands, naming it after Prince Frederick, Duke of York and Albany . Simcoe decided to move the Upper Canada capital from Newark (Niagara-on-the-Lake) to York, believing the new site would be less vulnerable to attack by the United States. The York garrison
6903-643: The attention of the general public in the 1990s by the novel, movie and play The Bridges of Madison County . In 1927, welding pioneer Stefan Bryła designed the first welded road bridge in the world, the Maurzyce Bridge which was later built across the river Słudwia at Maurzyce near Łowicz , Poland in 1929. In 1995, the American Welding Society presented the Historic Welded Structure Award for
7020-596: The basis of their cross-section. A slab can be solid or voided (though this is no longer favored for inspectability reasons) while beam-and-slab consists of concrete or steel girders connected by a concrete slab. A box-girder cross-section consists of a single-cell or multi-cellular box. In recent years, integral bridge construction has also become popular. Most bridges are fixed bridges, meaning they have no moving parts and stay in one place until they fail or are demolished. Temporary bridges, such as Bailey bridges , are designed to be assembled, taken apart, transported to
7137-437: The bridge to Poland. Bridges can be categorized in several different ways. Common categories include the type of structural elements used, by what they carry, whether they are fixed or movable, and by the materials used. Bridges may be classified by how the actions of tension , compression , bending , torsion and shear are distributed through their structure. Most bridges will employ all of these to some degree, but only
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#17327725842597254-402: The bridge. Toronto Toronto is the most populous city in Canada and the capital city of the Canadian province of Ontario . With a population of 2,794,356 in 2021, it is the fourth-most populous city in North America . The city is the anchor of the Golden Horseshoe , an urban agglomeration of 9,765,188 people (as of 2021) surrounding the western end of Lake Ontario , while
7371-413: The broadly disputed Toronto Purchase , when the Mississauga surrendered the area to the British Crown , the British established the town of York in 1793 and later designated it as the capital of Upper Canada . During the War of 1812 , the town was the site of the Battle of York and suffered heavy damage by American troops . York was renamed and incorporated in 1834 as the city of Toronto . It
7488-481: The capital until 1865 (two years before Canadian Confederation). Since then, the capital of Canada has remained Ottawa , Ontario. Toronto became the capital of the province of Ontario after its official creation in 1867. The seat of government of the Ontario briefly returned to the same building that hosted the Third Parliament Building of Upper Canada, before moving to the Ontario Legislative Building at Queen's Park in 1893. Because of its provincial capital status,
7605-439: The center of the bridge. Multi-way bridges with only three spans appear as a "T" or "Y" when viewed from above. Multi-way bridges are extremely rare. The Tridge , Margaret Bridge , and Zanesville Y-Bridge are examples. A bridge can be categorized by what it is designed to carry, such as trains, pedestrian or road traffic ( road bridge ), a pipeline ( Pipe bridge ) or waterway for water transport or barge traffic. An aqueduct
7722-617: The central city retain an ethnic identity, including two smaller Chinatowns, the Greektown area, Little Italy , Portugal Village , and Little India , among others. The inner suburbs are contained within the former municipalities of York and East York. These are mature and traditionally working-class areas, consisting primarily of post–World War I small, single-family homes and small apartment blocks. Neighbourhoods such as Crescent Town , Thorncliffe Park , Flemingdon Park , Weston, and Oakwood Village consist mainly of high-rise apartments, which are home to many new immigrant families. During
7839-407: The channel of the Don River have been dredged numerous times for shipping. The lower section of the Don River was straightened and channelled in the 19th century. The former mouth drained into a wetland; today, the Don River drains into the harbour through a concrete waterway, the Keating Channel . To mitigate flooding in the area, as well as to create parkland, a second more natural mouth was built to
7956-527: The city granted the operation of the transit franchise to the Toronto Railway Company . The public transit system passed into public ownership in 1921 as the Toronto Transportation Commission , later renamed the Toronto Transit Commission . The system now has the third-highest ridership of any city public transportation system in North America . The Great Toronto Fire of 1904 destroyed a large section of downtown Toronto . The fire destroyed more than 100 buildings. The fire claimed one victim, John Croft, who
8073-471: The city was also the location of Government House , the residence of the viceregal representative of the Crown in right of Ontario . Long before the Royal Military College of Canada was established in 1876, supporters of the concept proposed military colleges in Canada. Staffed by British Regulars, adult male students underwent a three-month-long military course at the School of Military Instruction in Toronto. Established by Militia General Order in 1864,
8190-414: The city was hit by a massive blackout which affected millions of Torontonians (it also affected most of Southern Ontario and parts of the United States), stranding some hundreds of people in tall buildings, knocking out traffic lights and suspending subway and streetcar service across the city during those aforementioned days. On March 6, 2009, the city celebrated the 175th anniversary of its inception as
8307-449: The city, there exist hundreds of small neighbourhoods and some larger neighbourhoods covering a few square kilometres. The many residential communities of Toronto express a character distinct from the skyscrapers in the commercial core. Victorian and Edwardian-era residential buildings can be found in enclaves such as Rosedale , Cabbagetown , The Annex , and Yorkville . The Wychwood Park neighbourhood, historically significant for
8424-467: The deck is thinner in proportion to its span, the lines of the structure are continuous, and the shapes of the structural elements reflect the forces acting on them. To create a beautiful image, some bridges are built much taller than necessary. This type, often found in east-Asian style gardens, is called a Moon bridge , evoking a rising full moon. Other garden bridges may cross only a dry bed of stream-washed pebbles, intended only to convey an impression of
8541-575: The elimination of racially based immigration policies by the late 1960s, Toronto became a destination for immigrants from all over the world. By the 1980s, Toronto had surpassed Montreal as Canada's most populous city and chief economic hub. During this time, in part owing to the political uncertainty raised by the resurgence of the Quebec sovereignty movement , many national and multinational corporations moved their head offices from Montreal to Toronto and Western Canadian cities. On January 1, 1998, Toronto
8658-618: The first human-made bridges with significant span were probably intentionally felled trees. Among the oldest timber bridges is the Holzbrücke Rapperswil-Hurden bridge that crossed upper Lake Zürich in Switzerland; prehistoric timber pilings discovered to the west of the Seedamm causeway date back to 1523 BC. The first wooden footbridge there led across Lake Zürich; it was reconstructed several times through
8775-698: The first mayor of Toronto . Mackenzie would later lead the unsuccessful Upper Canada Rebellion of 1837 against the British colonial government. Toronto's population of 9,000 included some African-American slaves, some of whom had been brought by the Loyalists, and Black Loyalists , whom the Crown had freed (most of the latter were resettled in Nova Scotia). By 1834, refugee slaves from America's South were also immigrating to Toronto to gain freedom. Slavery
8892-680: The hurricane caused more than CA$ 25 million in damage. In 1967, the seven smallest municipalities of Metropolitan Toronto were merged with larger neighbours, resulting in a six-municipality configuration that included the former city of Toronto and the surrounding municipalities of East York , Etobicoke , North York , Scarborough , and York . In the decades after World War II, refugees from war-torn Europe and Chinese job-seekers arrived, as well as construction labourers, particularly from Italy and Portugal. Toronto's population grew to more than one million in 1951 when large-scale suburbanization began and doubled to two million by 1971. Following
9009-400: The lake, allowing for a somewhat sheltered Toronto Harbour south of the downtown core. An Outer Harbour was constructed southeast of downtown during the 1950s and 1960s, and it is now used for recreation. The city's limits are formed by Lake Ontario to the south, the western boundary of Marie Curtis Park , Etobicoke Creek , Eglinton Avenue and Highway 427 to the west, Steeles Avenue to
9126-498: The large railroad yards that are needed for freight trains there, and also cross the multi-track railroad lines that are needed for heavy rail traffic. These viaducts provide grade separation and keep highway and city street traffic from having to be continually interrupted by the train traffic. Likewise, some viaducts carry railroads over large valleys, or they carry railroads over cities with many cross-streets and avenues. Many viaducts over land connect points of similar height in
9243-718: The late 1700s to the late 1800s, reminiscent of earlier designs in Germany and Switzerland. Some covered bridges were also built in Asia. In later years, some were partly made of stone or metal but the trusses were usually still made of wood; in the United States, there were three styles of trusses, the Queen Post, the Burr Arch and the Town Lattice. Hundreds of these structures still stand in North America. They were brought to
9360-470: The late 2nd century AD, when the Roman Empire built a 6-metre-wide (20 ft) wooden bridge to carry transport across the lake. Between 1358 and 1360, Rudolf IV, Duke of Austria , built a 'new' wooden bridge across the lake that was used until 1878; it was approximately 1,450 metres (4,760 ft) long and 4 metres (13 ft) wide. On 6 April 2001, a reconstruction of the original wooden footbridge
9477-427: The load is factored up by a factor greater than unity, while the resistance or capacity of the structure is factored down, by a factor less than unity. The effect of the factored load (stress, bending moment) should be less than the factored resistance to that effect. Both of these factors allow for uncertainty and are greater when the uncertainty is greater. Most bridges are utilitarian in appearance, but in some cases,
9594-409: The majority of Torontonians speak English as their primary language, over 160 languages are spoken in the city. The mayor of Toronto is elected by direct popular vote to serve as the chief executive of the city. The Toronto City Council is a unicameral legislative body, comprising 25 councillors since the 2018 municipal election , representing geographical wards throughout the city. Toronto
9711-515: The much longer established Montreal , Quebec. However, by 1934, the Toronto Stock Exchange had become the largest in the country. In 1954, the City of Toronto and 12 surrounding municipalities were federated into a regional government known as Metropolitan Toronto . The postwar boom had resulted in rapid suburban development. It was believed a coordinated land-use strategy and shared services would provide greater efficiency for
9828-567: The north and the Rouge River and the Scarborough–Pickering Townline to the east. The city is mostly flat or gentle hills, and the land gently slopes upward away from the lake. The flat land is interrupted by the Toronto ravine system , which is cut by numerous creeks and rivers of the Toronto waterway system , most notably the Humber River in the west end, the Don River east of downtown (these two rivers flanking and defining
9945-614: The obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it. The earliest bridges were likely made with fallen trees and stepping stones . The Neolithic people built boardwalk bridges across marshland. The Arkadiko Bridge , dating from
10062-629: The past, these load models were agreed by standard drafting committees of experts but today, this situation is changing. It is now possible to measure the components of bridge traffic load, to weigh trucks, using weigh-in-motion (WIM) technologies. With extensive WIM databases, it is possible to calculate the maximum expected load effect in the specified return period. This is an active area of research, addressing issues of opposing direction lanes, side-by-side (same direction) lanes, traffic growth, permit/non-permit vehicles and long-span bridges (see below). Rather than repeat this complex process every time
10179-472: The principles of Load and Resistance Factor Design . Before factoring to allow for uncertainty, the load effect is generally considered to be the maximum characteristic value in a specified return period . Notably, in Europe, it is the maximum value expected in 1000 years. Bridge standards generally include a load model, deemed to represent the characteristic maximum load to be expected in the return period. In
10296-465: The railway dramatically increased the numbers of immigrants arriving, commerce and industry, as had the Lake Ontario steamers and schooners entering port before. These enabled Toronto to become a major gateway linking the world to the interior of the North American continent. Expanding port and rail facilities brought in northern timber for export and imported Pennsylvania coal. Industry dominated
10413-514: The referendum results and did so in April when it tabled the City of Toronto Act . Both opposition parties held a filibuster in the provincial legislature, proposing more than 12,000 amendments that allowed residents on streets of the proposed megacity to take part in public hearings on the merger and adding historical designations to the streets. This only delayed the bill's inevitable passage, given
10530-468: The region. The metropolitan government began to manage services that crossed municipal boundaries, including highways, police services, water and public transit . In that year, a half-century after the Great Fire of 1904, disaster struck the city again when Hurricane Hazel brought intense winds and flash flooding. In the Toronto area, 81 people were killed, nearly 1,900 families were left homeless, and
10647-763: The roadways and reduced movement of the upper level when the lower level was installed three decades after the upper level. The Tsing Ma Bridge and Kap Shui Mun Bridge in Hong Kong have six lanes on their upper decks, and on their lower decks there are two lanes and a pair of tracks for MTR metro trains. Some double-decked bridges only use one level for street traffic; the Washington Avenue Bridge in Minneapolis reserves its lower level for automobile and light rail traffic and its upper level for pedestrian and bicycle traffic (predominantly students at
10764-734: The same year, has the span of 90 m (295 ft) and crosses the valley of the Syrabach River. The difference between the two is that the Solkan Bridge was built from stone blocks, whereas the Friedensbrücke was built from a mixture of crushed stone and cement mortar. The world's largest arch bridge is the Chaotianmen Bridge over the Yangtze River with a length of 1,741 m (5,712 ft) and
10881-490: The school enabled officers of militia or candidates for commission or promotion in the Militia to learn military duties, drill and discipline, to command a company at Battalion Drill, to drill a company at Company Drill, the internal economy of a company, and the duties of a company's officer. The school was retained at Confederation, in 1867. In 1868, Schools of cavalry and artillery instruction were formed in Toronto. In
10998-653: The simplest and oldest type of bridge in use today, and are a popular type. Some cantilever bridges also have a smaller beam connecting the two cantilevers, for extra strength. The largest cantilever bridge is the 549-metre (1,801 ft) Quebec Bridge in Quebec, Canada. With the span of 220 metres (720 ft), the Solkan Bridge over the Soča River at Solkan in Slovenia is the second-largest stone bridge in
11115-553: The south during the first half of the 2020s, thereby creating a new island, Ookwemin Minising . Toronto encompasses an area formerly administered by several separate municipalities that were amalgamated over the years. Each developed a distinct history and identity over the years, and their names remain in common use among Torontonians. Former municipalities include East York, Etobicoke, Forest Hill , Mimico , North York, Parkdale , Scarborough, Swansea , Weston and York. Throughout
11232-409: The storm and Toronto Pearson International Airport reported 126 mm (5 in) of rain had fallen over five hours, more than during Hurricane Hazel. Within six months, from December 20 to 22, 2013, Toronto was brought to a near halt by the worst ice storm in the city's history, rivalling the severity of the 1998 Ice Storm (which mainly affected southeastern Ontario, and Quebec). At the height of
11349-575: The storm, over 300,000 Toronto Hydro customers had no electricity or heating. Toronto hosted WorldPride in June 2014, and the Pan and Parapan American Games in 2015 . The city continues to grow and attract immigrants. A 2019 study by Toronto Metropolitan University (then known as Ryerson University) showed that Toronto was the fastest-growing city in North America. The city added 77,435 people between July 2017 and July 2018. The Toronto metropolitan area
11466-767: The time of the Warring States period , the oldest surviving stone bridge in China is the Zhaozhou Bridge , built from 595 to 605 AD during the Sui dynasty . This bridge is also historically significant as it is the world's oldest open-spandrel stone segmental arch bridge. European segmental arch bridges date back to at least the Alconétar Bridge (approximately 2nd century AD), while the enormous Roman era Trajan's Bridge (105 AD) featured open-spandrel segmental arches in wooden construction. Rope bridges ,
11583-467: The town's surrender. American soldiers destroyed much of the garrison and set fire to the parliament buildings during their five-day occupation. Because of the sacking of York, British troops retaliated later in the war with the burning of Washington, D.C. York was incorporated as the City of Toronto on March 6, 1834, adopting the Indigenous name. Reformist politician William Lyon Mackenzie became
11700-748: The undertimbers of bridges all around the world are spots of prevalent graffiti. Some bridges attract people attempting suicide, and become known as suicide bridges . The materials used to build the structure are also used to categorize bridges. Until the end of the 18th century, bridges were made out of timber, stone and masonry. Modern bridges are currently built in concrete, steel, fiber reinforced polymers (FRP), stainless steel or combinations of those materials. Living bridges have been constructed of live plants such as Ficus elastica tree roots in India and wisteria vines in Japan. Unlike buildings whose design
11817-466: The variation of strength found in natural stone. One type of cement, called pozzolana , consisted of water, lime , sand, and volcanic rock . Brick and mortar bridges were built after the Roman era , as the technology for cement was lost (then later rediscovered). In India, the Arthashastra treatise by Kautilya mentions the construction of dams and bridges. A Mauryan bridge near Girnar
11934-616: The war, and the area became part of the British colony of Quebec in 1763. During the American Revolutionary War , an influx of British settlers arrived there as United Empire Loyalists fled for the British-controlled lands north of Lake Ontario. The Crown granted them land to compensate for their losses in the Thirteen Colonies. The new province of Upper Canada was being created and needed
12051-645: The waterfront for the next 100 years. During the late 19th century, Toronto became the largest alcohol distillation (in particular, spirits ) centre in North America. By the 1860s, the Gooderham and Worts Distillery operations became the world's largest whisky factory. A preserved section of this once dominant local industry remains in the Distillery District . The harbour allowed access to grain and sugar imports used in processing. Horse-drawn streetcars gave way to electric streetcars in 1891 when
12168-433: The weld transitions . This results in a potential high benefit, using existing bridges far beyond the planned lifetime. While the response of a bridge to the applied loading is well understood, the applied traffic loading itself is still the subject of research. This is a statistical problem as loading is highly variable, particularly for road bridges. Load Effects in bridges (stresses, bending moments) are designed for using
12285-649: The word for the card game of the same name is unknown. The simplest and earliest types of bridges were stepping stones . Neolithic people also built a form of boardwalk across marshes ; examples of such bridges include the Sweet Track and the Post Track in England, approximately 6000 years old. Ancient people would also have used log bridges consisting of logs that fell naturally or were intentionally felled or placed across streams. Some of
12402-452: The world and the longest railroad stone bridge. It was completed in 1905. Its arch, which was constructed from over 5,000 tonnes (4,900 long tons; 5,500 short tons) of stone blocks in just 18 days, is the second-largest stone arch in the world, surpassed only by the Friedensbrücke (Syratalviadukt) in Plauen , and the largest railroad stone arch. The arch of the Friedensbrücke, which was built in
12519-524: Was a member of the Orange Order between 1850 and 1950, and the city was sometimes referred to as the " Belfast of Canada" because of Orange influence in municipal politics and administration. For brief periods, Toronto was twice the capital of the united Province of Canada : first from 1849 to 1851, following unrest in Montreal, and later from 1855 to 1859. After this date, Quebec was designated as
12636-469: Was an explosive expert clearing the ruins from the fire. It caused CA$ 10,387,000 in damage (roughly CA$ 277,600,000 in 2020 terms). The city received new European immigrant groups from the late 19th century into the early 20th century, particularly Germans, French, Italians, and Jews. They were soon followed by Russians, Poles, and other Eastern European nations, in addition to the Chinese entering from
12753-539: Was banned outright in Upper Canada (and throughout the British Empire) in 1834. Torontonians integrated people of colour into their society. In the 1840s, an eating house at Frederick and King Streets, a place of mercantile prosperity in the early city, was operated by a black man named Bloxom. As a major destination for immigrants to Canada, the city grew rapidly through the remainder of the 19th century. The first significant wave of immigrants were Irish, fleeing
12870-535: Was built at the entrance of the town's natural harbour, sheltered by a long sand-bar peninsula. The town's settlement formed at the harbour's eastern end behind the peninsula, near the present-day intersection of Parliament Street and Front Street (in the " Old Town " area). In 1813, as part of the War of 1812 , the Battle of York ended in the town's capture and plunder by United States forces. John Strachan negotiated
12987-535: Was designated as the capital of the province of Ontario in 1867 during Canadian Confederation . The city proper has since expanded past its original limits through both annexation and amalgamation to its current area of 630.2 km (243.3 sq mi). The diverse population of Toronto reflects its current and historical role as an important destination for immigrants to Canada . About half of its residents were born outside of Canada and over 200 ethnic origins are represented among its inhabitants. While
13104-573: Was greatly enlarged, not through traditional annexations , but as an amalgamation of the Municipality of Metropolitan Toronto and its six lower-tier constituent municipalities: East York, Etobicoke, North York, Scarborough, York, and the original city itself. They were dissolved by an act of the Government of Ontario and formed into a single-tier City of Toronto (colloquially dubbed the " megacity "), replacing all six governments. The merger
13221-527: Was opened; it is also the longest wooden bridge in Switzerland. The Arkadiko Bridge is one of four Mycenaean corbel arch bridges part of a former network of roads, designed to accommodate chariots , between the fort of Tiryns and town of Epidauros in the Peloponnese , in southern Greece . Dating to the Greek Bronze Age (13th century BC), it is one of the oldest arch bridges still in existence and use. Several intact, arched stone bridges from
13338-551: Was proposed as a cost-saving measure by the Progressive Conservative provincial government under premier Mike Harris . The announcement touched off vociferous public objections. In March 1997, a referendum in all six municipalities produced a vote of more than 3:1 against amalgamation. However, municipal governments in Canada are creatures of the provincial governments, and referendums have little to no legal effect. The Harris government could thus legally ignore
13455-408: Was ridiculed by some in other parts of the country, fuelled in part by what was perceived as a frivolous use of resources. The city attracted international attention in 2003 when it became the centre of a major SARS (severe acute respiratory syndrome) outbreak. Public health attempts to prevent the disease from spreading elsewhere temporarily dampened the local economy. From August 14 to 17, 2003,
13572-514: Was surveyed by James Princep . The bridge was swept away during a flood, and later repaired by Puspagupta, the chief architect of emperor Chandragupta I . The use of stronger bridges using plaited bamboo and iron chain was visible in India by about the 4th century. A number of bridges, both for military and commercial purposes, were constructed by the Mughal administration in India. Although large bridges of wooden construction existed in China at
13689-613: Was the second-fastest-growing metropolitan area in North America, adding 125,298 persons, compared with 131,767 in the Dallas–Fort Worth–Arlington metroplex in Texas. The large growth in the Toronto metropolitan area is attributed to international migration to Toronto. The COVID-19 pandemic in Canada first occurred in Toronto and was among the hotspots in the country . Toronto was named as one of 16 cities in North America (and one of two Canadian cities) to host matches for
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