In the middle of the 19th century, Chicago embarked on a quest to literally lift itself out of the mud. Water couldn’t drain from the low-lying city, so its streets became impassable swamps. The most reasonable solution, Chicago decided, was just to raise the whole goddamn city by 4 to 14 feet.
Unlike most other cities, Chicago sat just a few feet above the water level of Lake Michigan. Water flows down, so building a system that properly drained all of Chicago’s stormwater and sewage would required a whole lot of digging. That was deemed too expensive. The city was naturally lifted up instead.
Following a plan outlined by the Chicago Board of Sewerage Commissioners in 1855, the city passed an ordinance to raise the grade level of streets downtown and along the river. Over the next two decades, the city gradually grew taller. Buildings were jacked up, new foundations laid underneath, and the streets filled in with dirt after the new sewer pipes were installed.
Remarkably, life in the city went on as normal—as normal as life in such a rapidly growing city can be. The Tremont House, Chicago’s most eminent hotel, was raised inch by inch over several days as guests, including a U.S. senator, resided inside. An entire half block of Lake Street was also lifted in one huge engineering feat. The engineer behind it? A young George Pullman, who would go on to amass a fortune with his Pullman sleeping car. WBEZ describes how Pullman pulled it off:
He had 6,000 jackscrews put under the buildings, and hired 600 men to take charge of ten jacks each. On the signal, each man turned the screws on his ten jacks one notch. The buildings went up a fraction of an inch.
This process was repeated again and again over four days. Meanwhile, temporary timbers were placed under the buildings and new foundations constructed. Then the buildings were lowered into place. All this was smoothly done, while business inside the buildings went on as usual.
In other cases, whole buildings were dug up, put on logs, and rolled to a completely new location. A Scotsman visiting Chicago in 1868 observed, “Never a day passed during my stay in the city that I did not meet one or more houses shifting their quarters. One day I met nine.”
Thanks to the foresight and determination of mid-19th century Chicagoans, the city had one of the first comprehensive stormwater and wastewater systems in the country. But it came at a price: Sewage soon poured into Lake Michigan, polluting the city’s source of drinking water. That eventually led to the reversal of the Chicago River in 1900, yet another massive infrastructure project designed allow as many humans as possible to cram into the city. [Chicago Tribune, WBEZ, Chicago Magazine]
Factually is Gizmodo’s new blog of fun facts, interesting photos, and weird trivia. Join us on Twitter and Facebook.