Much of Chicago's water is pumped through a 20ft diameter tunnel from the "two mile crib", two miles offshore, to a filtration facility near Navy Pier.

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The "two mile crib" is formally called the Harrison-Dever crib, which is actually two different pumping stations. The larger, older one, the Carter Harrison crib, was built in 1900 to replace an even old one built in 1865, which was called the "two mile" crib. The other, newer one, was built to replace the Harrison crib. Called the Willam E Dever crib, named after a former Chicago mayor, was built in 1935 and is still in operation.