Lock and Dam No. 19

The main lock was constructed from 1952 to 1957 and is long and wide with a lift of just over and large enough to handle a full-length tow of barges. It was put into operation in 1957 at a cost of 13.5 million dollars. The 1957 lock replaced a 1910-1913 lock. The 1913 lock was a variant of the standardized Panama Canal design and was wide, long and tall with a lift. There was a wide, long and deep dry dock at the site, both the dry dock and 1913 lock were dewatered in 1977 when a sheet pile and cell closure were built blocking the upstream sides of the lock and dry dock. The lock and dam, as well as the rest of the river, can be viewed from a distance on the Observation Deck of the Keokuk Rail Bridge. ==Dam==

Construction of the dam began in 1910, and was completed in 1913. The movable portion of the dam is long with 119 separate rectangular, steel-skin plated, sliding gates. The gates are either installed or removed and river flow is controlled by the number of gates installed. They are removed by a gantry crane that travels on the service bridge above the dam. At the time it was completed, this dam was second in length only to the Egyptian Aswan Low Dam on the Nile River. ==Powerhouse==

Construction began in 1910 and when completed in 1913 it was the largest-capacity single-powerhouse electricity-generating plant in the world. The Power House and spillways are owned and operated by Ameren Missouri and has a 142 MW capacity. The powerhouse contains 15 generators, originally designed to produce 25 Hz instead of the 60 Hz alternating current used today. Keokuk and Hamilton Water Power landed contracts in 1910 to deliver 44.7 MW of electricity to three customers located in St. Louis, MO (more than 100 miles downstream), at a time when no electric power had been transmitted more than a few miles: The Union Electric Light and Power Company, Laclede Gas Company and United Railways Company, which operated the St. Louis Street Railway Company. Union Electric Co. purchased the facilities in 1925. The 25 Hz generators powered industrial customers and used for the Streetcars in St. Louis, Missouri. After World War II, a number of modernization improvements were undertaken. The 25-hertz generators were progressively converted to 60-hertz generators beginning in 1940s with the final units converted in 2002. Electronic automation replacement for some mechanical systems began in 1980s. Ameren Missouri, the current powerhouse owner, began replacement and conversion of the original 1913 turbines with more efficient stainless-steel turbines. Today, Keokuk Energy Center remains the largest privately-owned-and-operated dam on the Mississippi River. In addition to Lock and Dam No. 19, Lock and Dam No. 1, Lock and Dam No. 2 and the upper St. Anthony Falls dam also produce electricity on the Mississippi River system. ==See also==