The Water cribs in Chicago supply the City of Chicago with drinking water from Lake Michigan. The first water crib, the Two-Mile Crib was constructed as part of a scheme by Ellis S. Chesbrough in 1865. Water was collected and transported through a tunnel 60 feet below the lake surface to the Chicago Avenue pumping station. This was replaced by the Carter H. Harrison crib in 1900 (located at 41°54′59″N 87°34′23″W / 41.91639°N 87.57306°W / 41.91639; -87.57306), which itself was intended to be replaced by the William E. Dever crib that was built alongside it in 1935. However increased water demand meant that the Carter H. Harrison crib continued in service until 1997.
Other cribs include the Wilson Avenue crib (located at 41°57′58″N 87°35′28″W / 41.96611°N 87.59111°W / 41.96611; -87.59111), the Four Mile Crib (41°52′22″N 87°32′45″W / 41.87278°N 87.54583°W / 41.87278; -87.54583), and the 68th Street crib (41°47′10″N 87°31′54″W / 41.78611°N 87.53167°W / 41.78611; -87.53167). The 68th Street crib was the site of a fire that killed 70 workmen on the morning of January 20, 1909. The tunnels leading from the cribs are close to 200 feet beneath the lake and vary in shape from circular to ovular and in diameter from 10 to 20 feet. Lake water enters the cribs and flows through these tunnels to pumps at the Jardine Water Purification Plant (the world's largest) and the South Water Purification Plant where the water is then treated. From there it is pumped to all parts of the city as well as 118 suburbs.
Until the 1990s, Crib Tenders lived on the cribs. Usually four man crews stayed aboard the cribs for a week at a time. Their duties included water testing, light maintenance, and dynamiting ice dams that formed against the cribs' walls. Crib facilities included rudimentary bathrooms, showers, and bunk rooms—and a fantastic view of the city and lake.
The Chicago cribs have also been designated a "security zone". In 2002 complete security systems were installed, including video, motion detectors, microwave link, and door sensors, all with direct links to Chicago Police monitoring stations. Any craft that enters the buoyed security zone is subject to boarding, ticketing and impounding.
Read more about Water Cribs In Chicago: Carter Harrison Crib Tunnel Collapse, Carter-Harrison Crib Images
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