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The Chicago Harbor Lock, also known as the Chicago River & Harbor Controlling Works, is a stop lock and dam located within the Chicago Harbor in Chicago, Illinois at the mouth of the Chicago River. It is a component of the Chicago Area Waterway System , and is used to control water diversion from Lake Michigan into the river and for navigation.
Predating the lock and dam was the Blue Island Lock, constructed at the eastern end of the Cal-Sag Channel in 1922. Nearly as soon as its completion, there was already lobbying by various industries along the waterway to expand the size of the lock, which measured 360 by 50 feet (110 m × 15 m).
There are three major locks within the CAWS, operated by the Army Corps of Engineers: the Chicago Harbor Lock, the Lockport Lock & Dam, and the T.J. O'Brien Lock and Dam. [4] Artificial waterways connecting the Mississippi and Great Lakes systems via the Chicago area, over the Chicago Portage, began with the I&M Canal in 1848. [5]
The main entrance to this harbor is marked by the Chicago Harbor Lighthouse. The Jardine Water Purification Plant, Navy Pier, the Chicago Harbor Lock, Coast Guard Station Chicago, two municipal harbors (DuSable Harbor and Monroe Harbor), the Chicago Yacht Club, and the Columbia Yacht Club are all located here. [2]
About 15 percent of the lock chambers are 1,000 to 1,200 ft (300 to 370 m) long, 60 percent are 600 to 999 ft (183 to 304 m) long, and 25 percent are less than 600 feet (180 m) long. Lock widths are mostly 110 feet (34 m). The 1,200-foot (370 m) locks can accommodate a tow of 17 barges plus the towboat, while the 600-foot (180 m) locks can ...
A house of cards (also known as a card tower or card castle) is a structure created by stacking playing cards on top of each other, often in the shape of a pyramid. "House of cards" is also an expression that dates back to 1645 [ 1 ] meaning a structure or argument built on a shaky foundation or one that will collapse if a necessary (but ...