Lock and Dam No. 20
Encyclopedia
Lock and Dam No. 20 is a lock
and dam
located on the Upper
Mississippi
River, about one mile upstream from Canton, Missouri
.
The structure is located at river mile
343.1. It includes a 2369 feet (722.1 m) long dam, 40 tainter gate
s, 3 roller gates
, and a lock chamber that is 110 feet (33.5 m) wide by 600 feet (182.9 m) long. There is also an incomplete auxiliary lock. In 2004, the facility was listed in the National Register of Historic Places
as Lock and Dam No. 25 Historic District, #04000180 covering 839 acres (3.4 km²), 1 building, 6 structures, 3 objects.
Lock (water transport)
A lock is a device for raising and lowering boats between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is...
and dam
Dam
A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...
located on the Upper
Upper Mississippi River
The Upper Mississippi River is the portion of the Mississippi River upstream of Cairo, Illinois, United States. From the headwaters at Lake Itasca, Minnesota, the river flows approximately 2000 kilometers to Cairo, where it is joined by the Ohio River to form the Lower Mississippi...
Mississippi
Mississippi
Mississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
River, about one mile upstream from Canton, Missouri
Canton, Missouri
Canton is a city in Lewis County, Missouri, United States. The population was 2,557 at the 2000 census. Canton is the site of Culver-Stockton College, a small liberal arts college affiliated with the Christian Church...
.
The structure is located at river mile
River mile
In the United States, a River mile is a measure of distance in miles along a river from its mouth. River mile numbers begin at zero and increase further upstream. The corresponding metric unit using kilometers is the River kilometer...
343.1. It includes a 2369 feet (722.1 m) long dam, 40 tainter gate
Tainter gate
The Tainter gate is a type of radial arm floodgate used in dams and canal locks to control water flow. It is named for Wisconsin structural engineer Jeremiah Burnham Tainter....
s, 3 roller gates
Roller dam
A Roller dam is a type of hydro-control device specially designed to mitigate erosion. They are most often used to divert water for irrigation but the largest and most notable examples are used to ease river navigation.- Use :...
, and a lock chamber that is 110 feet (33.5 m) wide by 600 feet (182.9 m) long. There is also an incomplete auxiliary lock. In 2004, the facility was listed in the National Register of Historic Places
National Register of Historic Places
The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...
as Lock and Dam No. 25 Historic District, #04000180 covering 839 acres (3.4 km²), 1 building, 6 structures, 3 objects.
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