|Great Chicago Fire|
|Cost||$222 million (1871 USD)  ($4.593 billion in 2018) |
|Date(s)||October 8, 1871– October 10, 1871|
|Burned area||2,112 acres (8.55 km2)|
|Fatalities||300 killed (estimated)|
The Great Chicago Fire was a conflagration that burned from Sunday, October 8, to Tuesday, October 10, 1871. The fire killed up to 300 people, destroyed roughly 3.3 square miles (9 km2) of Chicago, Illinois, and left more than 100,000 residents homeless.  The fire began in a neighborhood southwest of the city center. A long period of hot, dry, windy conditions, and the wooden construction prevalent in the city lead to a conflagration. The fire leapt the south branch of the Chicago River and destroyed much of central Chicago, and then leapt the main branch of the river consuming the near north side.
Help flowed to the city from near and far after the fire. The City of Chicago improved building codes to stop the rapid spread of fire, and re-built rapidly to those higher standards. A donation from the United Kingdom spurred the establishment of the Chicago Public Library, a free public library system, a contrast to the private, fee for membership libraries common before the fire.
The fire started at about 9:00 p.m. on October 8, in or around a small barn belonging to the O'Leary family that bordered the alley behind 137 DeKoven Street.  The shed next to the barn was the first building to be consumed by the fire. City officials never determined the exact cause of the blaze,  but the rapid spread of the fire due to a long drought in the prior summer, strong winds from the southwest, and the rapid destruction of the water pumping system explain the extensive damage of the mainly wooden city structures. There has been much speculation over the years on a single start to the fire. The most popular tale blames Mrs. O'Leary's cow, who allegedly knocked over a lantern; others state that a group of men were gambling inside the barn and knocked over a lantern.  Still other speculation suggests that the blaze was related to other fires in the Midwest that day. 
The fire's spread was aided by the city's use of wood as the predominant building material in a style called balloon frame. More than two thirds of the structures in Chicago at the time of the fire were made entirely of wood, with most of the houses and buildings being topped with highly flammable tar or shingle roofs. All of the city's sidewalks and many roads were also made of wood.  Compounding this problem, Chicago received only 1 inch (25 mm) of rain from July 4 to October 9, causing severe drought conditions before the fire, while strong southwest winds helped to carry flying embers toward the heart of the city. :144
In 1871, the Chicago Fire Department had 185 firefighters with just 17 horse-drawn steam engines to protect the entire city. :146 The initial response by the fire department was quick, but due to an error by the watchman, Matthias Schaffer, the firefighters were sent to the wrong place, allowing the fire to grow unchecked. :146 An alarm sent from the area near the fire also failed to register at the courthouse where the fire watchmen were, while the firefighters were tired from having fought numerous small fires and one large fire in the week before.  These factors combined to turn a small barn fire into a conflagration.
When firefighters finally arrived at DeKoven Street, the fire had grown and spread to neighboring buildings and was progressing toward the central business district. Firefighters had hoped that the South Branch of the Chicago River and an area that had previously thoroughly burned would act as a natural firebreak. :147 All along the river, however, were lumber yards, warehouses, and coal yards, and barges and numerous bridges across the river. As the fire grew, the southwest wind intensified and became superheated, causing structures to catch fire from the heat and from burning debris blown by the wind. Around 12:00 p.m., flaming debris blew across the river and landed on roofs and the South Side Gas Works. :148
With the fire across the river and moving rapidly toward the heart of the city, panic set in. About this time, Mayor Roswell B. Mason sent messages to nearby towns asking for help. When the courthouse caught fire, he ordered the building to be evacuated and the prisoners jailed in the basement to be released. At 2:30 a.m. on the 9th, the cupola of the courthouse collapsed, sending the great bell crashing down. :148 Some witnesses reported hearing the sound from a mile (1.6 km) away.
As more buildings succumbed to the flames, a major contributing factor to the fire’s spread was a meteorological phenomenon known as a fire whirl.  As overheated air rises, it comes into contact with cooler air and begins to spin creating a tornado-like effect. These fire whirls are likely what drove flaming debris so high and so far. Such debris was blown across the main branch of the Chicago River to a railroad car carrying kerosene. :152 The fire had jumped the river a second time and was now raging across the city’s north side.
Despite the fire spreading and growing rapidly, the city's firefighters continued to battle the blaze. A short time after the fire jumped the river, a burning piece of timber lodged on the roof of the city’s waterworks. Within minutes, the interior of the building was engulfed in flames and the building was destroyed. With it, the city’s water mains went dry and the city was helpless. :152–3 The fire burned unchecked from building to building, block to block.
Finally, late into the evening of the 9th, it started to rain, but the fire had already started to burn itself out. The fire had spread to the sparsely populated areas of the north side, having consumed the densely populated areas thoroughly. :158
Once the fire had ended, the smoldering remains were still too hot for a survey of the damage to be completed for many days. Eventually, the city determined that the fire destroyed an area about 4 miles (6 km) long and averaging 3⁄4 mile (1 km) wide, encompassing an area of more than 2,000 acres (809 ha). :159 Destroyed were more than 73 miles (117 km) of roads, 120 miles (190 km) of sidewalk, 2,000 lampposts, 17,500 buildings, and $222 million in property,  which was about a third of the city's valuation in 1871. 
Of the 300,000 inhabitants of Chicago in 1871, 100,000 were left homeless, one-third of the population. 120 bodies were recovered, but the death toll may have been as high as 300. The county coroner speculated that an accurate count was impossible, as some victims may have drowned or had been incinerated, leaving no remains.
In the days and weeks following the fire, monetary donations flowed into Chicago from around the country and abroad, along with donations of food, clothing, and other goods. These donations came from individuals, corporations, and cities. New York City gave $450,000 along with clothing and provisions, St. Louis gave $300,000, and the Common Council of London gave 1,000 guineas, as well as ₤7,000 from private donations.  In Greenock, Scotland (pop. 40,000) a town meeting raised £518 on the spot.  Cincinnati, Cleveland, and Buffalo, all commercial rivals, donated hundreds and thousands of dollars. Milwaukee, along with other nearby cities, helped by sending fire-fighting equipment. Additionally, food, clothing and books were brought by train from all over the continent.  Mayor Mason placed the Chicago Relief and Aid Society in charge of the city’s relief efforts. :162
Operating from the First Congregational Church, city officials and aldermen began taking steps to preserve order in Chicago. Price gouging was a key concern, and in one ordinance, the city set the price of bread at 8¢ for a 12-ounce (340 g) loaf.  Public buildings were opened as places of refuge, and saloons closed at 9 in the evening for the week following the fire. Many people who were left homeless after the incident were never able to get their normal lives back since all their personal papers and belongings burned in the conflagration.
After the fire, A.H. Burgess of London proposed an “English Book Donation,” to spur a free library in Chicago, in their sympathy with Chicago over the damages suffered.  Libraries in Chicago had been private with membership fees. In April 1872, the City Council passed the ordinance to establish the free Chicago Public Library, starting with the donation from the United Kingdom of more than 8,000 volumes. 
The fire also led to questions about development in the United States. Due to Chicago’s rapid expansion at that time, the fire led to Americans reflecting on industrialization. Based on a religious point of view, some said that Americans should return to a more old-fashioned way of life, and that the fire was caused by people ignoring traditional morality. On the other hand, others believed that a lesson to be learned from the fire was that cities needed to improve their building techniques. Frederick Law Olmsted observed that poor building practices in Chicago were a problem:
"Chicago had a weakness for "big things," and liked to think that it was outbuilding New York. It did a great deal of commercial advertising in its house-tops. The faults of construction as well as of art in its great showy buildings must have been numerous. Their walls were thin, and were overweighted with gross and coarse misornamentation."
Olmsted also believed that with brick walls, and disciplined firemen and police, the deaths and damage caused would have been much less. 
Almost immediately, the city began to rewrite its fire standards, spurred by the efforts of leading insurance executives, and fire-prevention reformers such as Arthur C. Ducat. Chicago soon developed one of the country's leading fire-fighting forces.
Business owners, and land speculators such as Gurdon Saltonstall Hubbard, quickly set about rebuilding the city. The first load of lumber for rebuilding was delivered the day the last burning building was extinguished. By the World's Columbian Exposition 22 years later, Chicago hosted more than 21 million visitors. The Palmer House hotel burned to the ground in the fire 13 days after its grand opening. Its developer, Potter Palmer, secured a loan and rebuilt the hotel to higher standards across the street from the original, proclaiming it to be "The World's First Fireproof Building".
In 1956, the remaining structures on the original O'Leary property at 558 W. DeKoven Street were torn down for construction of the Chicago Fire Academy, a training facility for Chicago firefighters, known as the Quinn Fire Academy or Chicago Fire Department Training Facility. A bronze sculpture of stylized flames, entitled Pillar of Fire by sculptor Egon Weiner, was erected on the point of origin in 1961. 
The following structures are the only structures from the burned district still standing:
- St. Michael's Church, Old Town
- Chicago Water Tower
- Chicago Avenue Pumping Station
- Police Constable Bellinger's cottage at 2121 N. Hudson 
St. Michael's Church and the Pumping Station were both gutted in the fire, but their exteriors survived, and the buildings were rebuilt using the surviving walls. Additionally, though the inhabitable portions of the building were destroyed, the bell tower of St. James Cathedral survived the fire and was incorporated into the rebuilt church. The stones near the top of the tower are still blackened from the soot and smoke.
A couple of wooden cottages on North Cleveland Avenue also survived the blaze. 
The most popular and enduring legend maintains that the fire began in the O'Leary barn, as Mrs. O’Leary was milking her cow. The cow kicked over a lantern (or an oil lamp in some versions), setting fire to the barn. The O'Leary family denied this, stating that they were in bed before the fire started, but stories of the cow began to spread across the city. Catherine O'Leary seemed the perfect scapegoat: she was a poor, Irish Catholic immigrant. During the latter half of the 19th century, anti-Irish sentiment was strong throughout the United States and in Chicago. This was intensified as a result of the growing political power of the city's Irish population. :442 Furthermore, the United States had been distrustful of Catholics (or " papists", as they were often called) since its beginning, carrying over attitudes in England in the 17th century      ; as an Irish Catholic, Mrs. O'Leary was a target of both anti-Catholic and anti-Irish sentiment. This story was circulating in Chicago even before the flames had died out, and it was noted in the Chicago Tribunes first post-fire issue. In 1893 the reporter Michael Ahern retracted the "cow-and-lantern" story, admitting it was fabricated, but even his confession was unable to put the legend to rest.  Although the O'Learys were never officially charged with starting the fire, the story became so engrained in local lore that Chicago's city council officially exonerated them—and the cow—in 1997. 
Amateur historian Richard Bales has suggested the fire started when Daniel "Pegleg" Sullivan, who first reported the fire, ignited hay in the barn while trying to steal milk. :127–130 Part of Bales' evidence includes an account by Sullivan who claimed in an inquiry before the Fire Department of Chicago on November 25, 1871 that he saw the fire coming through the side of the barn and ran across DeKoven Street to free the animals from the barn, one of which included a cow owned by Sullivan's mother.  Bales' account does not have consensus. The Chicago Public Library staff criticized his account in their web page on the fire.  Despite this, the Chicago city council was convinced of Bales' argument and stated that the actions of Sullivan on that day should be scrutinized after the O'Leary family was exonerated in 1997.  
Anthony DeBartolo reported evidence in two articles the Chicago Tribune (October 8, 1997 and March 3, 1998, reprinted in Hyde Park Media) suggesting that Louis M. Cohn may have started the fire during a craps game.    According to Cohn, on the night of the fire, he was gambling in the O'Learys' barn with one of their sons and some other neighborhood boys. When Mrs. O'Leary came out to the barn to chase the gamblers away at around 9:00, they knocked over a lantern in their flight, although Cohn states that he paused long enough to scoop up the money. Following his death in 1942, Cohn bequeathed $35,000 which was assigned by his executors to the Medill School of Journalism at Northwestern University. The bequest was given to the school on September 28, 1944.  The argument is not universally accepted. 
An alternative theory, first suggested in 1882 by Ignatius L. Donnelly in Ragnarok: The Age of Fire and Gravel, is that the fire was caused by a meteor shower. This was described as "A fringe theory" concering Biela's Comet. At a 2004 conference of the Aerospace Corporation and the American Institute of Aeronautics and Astronautics, engineer and physicist Robert Wood suggested that the fire began when Biela's Comet broke up over the Midwest. That four large fires took place, all on the same day, all on the shores of Lake Michigan (see Related Events), suggests a common root cause. Eyewitnesses reported sighting spontaneous ignitions, lack of smoke, "balls of fire" falling from the sky, and blue flames. According to Wood, these accounts suggest that the fires were caused by the methane that is commonly found in comets.  Meteorites are not known to start or spread fires and are cool to the touch after reaching the ground, so this theory has not found favor in the scientific community.   Methane-air mixtures become flammable only when the methane concentration exceeds 5%, at which point the mixtures also become explosive, a situation unlikely to occur from meteorites.   Methane gas is lighter than air and thus does not accumulate near the ground;  any localized pockets of methane in the open air rapidly dissipate. Moreover, if a fragment of an icy comet were to strike the Earth, the most likely outcome, due to the low tensile strength of such bodies, would be for it to disintegrate in the upper atmosphere, leading to an air burst explosion analogous to that of the Tunguska event. 
A common cause for the fires in the Midwest in the fall of 1871 is that the area had suffered through a tinder-dry summer, so that winds from the front that moved in that evening were capable of generating rapidly expanding blazes from available ignition sources, which were plentiful in the region.  :111
On that hot, dry, and windy autumn day, three other major fires occurred along the shores of Lake Michigan at the same time as the Great Chicago Fire. Some 250 miles (400 km) to the north, the Peshtigo Fire consumed the town of Peshtigo, Wisconsin, along with a dozen other villages. It killed 1,200 to 2,500 people and charred approximately 1.5 million acres (6,000 km²). The Peshtigo Fire remains the deadliest in American history  but the remoteness of the region meant it was little noticed at the time, due to the fact that one of the first things that burned were the telegraph lines to Green Bay. 
Across the lake to the east, the town of Holland, Michigan, and other nearby areas burned to the ground.  Some 100 miles (160 km) to the north of Holland, the lumbering community of Manistee also went up in flames  in what became known as The Great Michigan Fire. 
Farther east, along the shore of Lake Huron, the Port Huron Fire swept through Port Huron, Michigan and much of Michigan's "Thumb". On October 9, 1871, a fire swept through the city of Urbana, Illinois, 140 miles (230 km) south of Chicago, destroying portions of its downtown area.  Windsor, Ontario, likewise burned on October 12. 
The city of Singapore, Michigan, provided a large portion of the lumber to rebuild Chicago. As a result, the area was so heavily deforested that the land deteriorated into barren sand dunes that buried the town, and the town had to be abandoned. 
This section needs additional citations for verification. (October 2018) ( Learn how and when to remove this template message)
- The University of Illinois at Chicago athletic teams are named the Flames since 1982, in commemoration of the Great Chicago Fire. 
- Although set in Philadelphia, Theodore Dreiser's 1912 novel The Financier portrays the nationwide impact the 1871 Chicago fire had on the stock markets and the financial world. 
- The 1937 film In Old Chicago is centered on the fire, with a highly fictionalized portrayal of the O'Leary family as the main characters. 
- In 1974, the Chicago Fire football team had played in the short-lived World Football League. Another Chicago Fire played in the American Football Association.
- Events of the 1986 novel Illinois! by Noel Gerson writing as Dana Fuller Ross occur around the Great Chicago Fire. 
- The 1987 Williams pinball "Fire!" was inspired by the Great Chicago Fire. A cow sound can be heard at the start of gameplay, alluding to Mrs. O'Leary's cow.
- The 1996 book The Great Fire by Jim Murphy tells the story of the fire for children, and won the Newberry Medal in 1996.
- The Major League Soccer team Chicago Fire was founded on October 8, 1997, the 126th anniversary of the Great Chicago Fire.
- In 2014, the city of Chicago and Redmoon Theater partnered to create The Great Chicago Fire Festival. Held on October 4, 2014, the event fell victim to technical difficulties as replicas of 1871 houses on floating barges in the Chicago River failed to ignite properly due to electrical problems and heavy rain on the preceding days. 
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