Melvin Price Locks and Dam

Melvin Price Locks and Dam is a dam and two locks at river mile 200.78 on the Upper Mississippi River, about 17 miles (27 km) north of Saint Louis, Missouri. The collocated National Great Rivers Museum  [Wikidata], explains the structure and its engineering.

Melvin Price Locks and Dam
Mississippi River Lock and Dam number 26.jpg
Melvin Price Locks and Dam
(Lock and Dam number 26)
Melvin Price Locks and Dam is located in Missouri
Melvin Price Locks and Dam
Location of Melvin Price Locks and Dam in Missouri
LocationAlton, Illinois / West Alton, Missouri, USA
Coordinates38°52′09″N 90°09′13″W / 38.86917°N 90.15361°W / 38.86917; -90.15361Coordinates: 38°52′09″N 90°09′13″W / 38.86917°N 90.15361°W / 38.86917; -90.15361
Construction began1978
Opening date1989
Operator(s)United States Army Corps of Engineers logo.svg U.S. Army Corps of Engineers, St. Louis District
Dam and spillways
ImpoundsUpper Mississippi River
Length1,160 feet (353.6 m)
CreatesPool 26
Total capacity238,000 acre⋅ft (0.294 km3)
Catchment area171,470 sq mi (444,100 km2)


Construction began in 1979, the main lock opened in 1990, and the full structure was completed in 1994. It replaced the earlier Lock and Dam No. 26, demolished in 1990, and is the first replacement structure on the Upper Mississippi River nine-foot navigation project. The main lock is 1,200 feet (370 m) long and 110 feet (34 m) wide; the auxiliary is 600 feet (180 m) long and 110 feet (34 m) wide. The main lock has a vertical lift gate and a miter gate while the aux. lock has two miter gates. The dam is 1,160 feet (350 m) long with 9 tainter gates, each 110 feet (34 m) wide by 42 feet (13 m) high.

It is named after Illinois Congressman Charles Melvin Price.



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