Great Chicago Fire (1871): How the City Burned and Rebuilt

The Great Chicago Fire burned from the evening of 8 October to the early hours of 10 October 1871 and destroyed the heart of Chicago, Illinois, then one of the fastest-growing cities in the world. It killed about 300 people, left around 100,000 homeless and consumed some 17,500 buildings. The disaster gave rise to one of America’s most persistent legends, about Mrs O’Leary’s cow, and to a rebuilding that turned Chicago into a laboratory of modern architecture.

Background: a city built of wood

In 1871 Chicago had about 324,000 inhabitants, up from fewer than 30,000 two decades earlier. It was the rail and grain hub of the American Midwest, and it had been built quickly and cheaply. Roughly two-thirds of its buildings were made of wood, many streets were paved with wooden blocks, and miles of pavements were raised wooden boardwalks.

Even buildings that looked solid often had wooden frames, tar or shingle roofs and ornamental cornices of painted wood. Lumberyards, furniture factories, coal yards and grain elevators lined the Chicago River in the middle of the city.

The summer and autumn of 1871 had been unusually dry across the Upper Midwest, with only a fraction of normal rainfall between July and October. Small fires broke out almost daily in the city. On the night of 7 October a large blaze on the West Side burned several blocks and left the city’s firefighters exhausted and some of their equipment damaged.

How the fire started

At about 9 p.m. on Sunday 8 October 1871 a fire started in or near the barn behind the cottage of Patrick and Catherine O’Leary at 137 DeKoven Street, in a working-class Irish neighbourhood southwest of the city centre. The cause has never been determined.

The response went wrong from the start. A fire watchman in the courthouse tower misjudged the location and sent engines to the wrong area. An alarm from a local box was not registered at the central station. By the time crews arrived, the fire had spread to neighbouring sheds and houses and was being driven north-east by a strong, hot south-westerly wind.

Chicago had a professional fire department, but it had fewer than 200 men and about 17 horse-drawn steam engines for the entire city. Fire Marshal Robert A. Williams and his crews could not get ahead of the flames.

The fire spreads

The wind carried burning brands across the South Branch of the Chicago River shortly before midnight. A stable and then a gasworks caught fire, and the flames swept into the South Side business district.

Through the night the fire destroyed banks, hotels, newspaper offices, theatres, department stores and the courthouse. Its great bell crashed down as the building burned. Buildings advertised as fireproof, built of stone or iron, failed as their interiors and wooden roofs ignited. The fire created its own strong winds, sometimes described as fire whirls or “fire devils”, which carried burning debris long distances.

After midnight flames leapt the main channel of the Chicago River into the largely residential North Side. In the early morning of 9 October the roof of the city waterworks pumping station caught fire and the pumps stopped. From then on the hydrants were dry, and firefighters could do little but try to create firebreaks, sometimes with gunpowder.

Tens of thousands fled with whatever they could carry. Crowds poured across bridges, sheltered in the sand along Lake Michigan or waded into the water, and filled Lincoln Park and the open prairie to the north and west. Looting and drunkenness were reported, though contemporary accounts often exaggerated them.

On the night of 9 to 10 October rain began to fall. By then the fire had reached the northern edge of the city’s built-up area and the lakeshore, and it burned itself out in the early hours of 10 October.

By the numbers

Property losses were about a third of the city’s total valuation. Dozens of insurance companies failed because they could not pay the claims.

Key people

Catherine and Patrick O’Leary were Irish immigrants who kept cows and sold milk. Their own cottage survived the fire, but Catherine O’Leary was blamed by press and public for the rest of her life.

Roswell B. Mason was mayor of Chicago. On 11 October he put the city’s peace under the command of General Philip Sheridan, the Civil War cavalry commander then based in Chicago, who brought in troops and organised volunteer militia. Illinois Governor John M. Palmer objected that this was illegal, and the arrangement was ended within about two weeks after a volunteer guard shot and killed a prominent citizen.

Robert A. Williams, the fire marshal, led the firefighting and was later criticised, although an official inquiry concluded the fire was beyond the department’s capacity under the conditions.

Relief and rebuilding

Help poured in. Money, food and clothing arrived from across the United States and from Europe; donations totalled several million dollars. The Chicago Relief and Aid Society, a private organisation of business leaders, took control of distribution, a decision criticised at the time for its strict rules and for favouring “respectable” applicants.

Chicago rebuilt with astonishing speed. Within days merchants were trading from temporary shacks, and within a few years most of the business district had been replaced. Eastern and British investors lent money because they believed in the city’s future as a transport hub, and the railways, stockyards and most grain elevators had survived outside the burned area.

The city tightened its fire rules, banning new wooden buildings in a widening central zone. A second large fire in July 1874 prompted insurers to demand stronger enforcement and further reform of the fire department.

The rebuilding drew ambitious architects and engineers. William Le Baron Jenney’s Home Insurance Building of 1885, often called the first skyscraper because of its load-bearing metal frame, was followed by the work of Louis Sullivan, Daniel Burnham and others known as the Chicago School. By 1890 Chicago’s population had passed one million, and in 1893 the city hosted the World’s Columbian Exposition.

Myths and facts

Mrs O’Leary’s cow. The famous story that a cow kicked over a lantern while being milked appeared in the press within days. There is no evidence for it. In 1893 the former reporter Michael Ahern wrote that he and other journalists had invented the detail. The official inquiry in 1871 could not determine how the fire began. Historians have suggested other possibilities, including a neighbour, Daniel “Peg Leg” Sullivan, who first raised the alarm, or men gambling in the barn, but none has been proved. In 1997 the Chicago City Council formally exonerated Catherine O’Leary and her cow.

The legend reflected widespread prejudice against Irish Catholic immigrants and the poor. Catherine O’Leary, who was asleep when the fire started according to her own testimony, avoided publicity for the rest of her life.

A meteor shower. A theory first proposed in the 1880s, and revived in the twentieth century, linked the Chicago fire and the Peshtigo Fire the same night to fragments of a comet. Scientists reject it: meteorites are cool when they reach the ground. The fires are explained by drought, wind and dry fuel.

The whole city burned. It did not. The West Side beyond the starting point, most of the South Side and the stockyards survived, which helped the rapid recovery.

Legacy

The fire is one of the defining events in Chicago’s identity. One of the four stars on the city flag represents it, and the Chicago Fire Department’s training academy stands on the site of the O’Leary property. The Water Tower on Michigan Avenue, which survived, became a symbol of the city’s resilience.

In the United States, Fire Prevention Week is held each year during the week of 9 October in remembrance of the fire. The disaster is often placed alongside the Great Fire of London of 1666 as an example of a city transformed by catastrophe, and later urban disasters such as the San Francisco earthquake of 1906 were measured against it.

Timeline

• 1871, July–October: Severe drought across the Upper Midwest.
• 1871, 7 October: A large fire on Chicago’s West Side exhausts the fire department.
• 1871, 8 October, about 9 p.m.: Fire starts near the O’Leary barn on DeKoven Street.
• 1871, 8 October, before midnight: Flames cross the South Branch of the Chicago River.
• 1871, 9 October, early morning: The courthouse burns; the waterworks fails; fire crosses to the North Side.
• 1871, 10 October, early hours: Rain and lack of fuel end the fire.
• 1871, 11 October: Mayor Mason gives General Sheridan responsibility for keeping order.
• 1874, 14 July: A second major fire burns part of the South Side.
• 1885: Home Insurance Building completed.
• 1997: Chicago City Council exonerates Catherine O’Leary.

Why it matters

The Great Chicago Fire showed how quickly a crowded, wooden industrial city could be destroyed, and it pushed American cities towards stricter building codes and professional firefighting. Chicago’s rapid reconstruction, and the innovative architecture that followed, made the fire a turning point in the city’s history rather than its end.