Lock and Dam No. 10 is a lock and dam located in Guttenberg, Iowa on the Upper Mississippi River around river mile 615.0. It was constructed and placed in operation November 1937. The site underwent major rehabilitation 1989—2006. The dam consists of a concrete dam 763 feet (232.6 m) long with four roller gates and eight tainter gates. The earth embankment is 4,223 feet (1,287.2 m) long^[1] with a concrete spillway 1,200 feet (365.8 m) long. The lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long. The lock and dam are owned and operated by the St. Paul District of the United States Army Corps of Engineers-Mississippi Valley Division.

Lock and Dam No. 10
Mississippi River Lock and Dam number 10
Location of Lock and Dam No. 10 in Iowa
Location	Guttenberg, Clayton County, Iowa / Glen Haven, Grant County, Wisconsin, USA
Coordinates	42°47′06″N 91°05′42″W / 42.78500°N 91.09500°W / 42.78500; -91.09500
Construction began	1934; 90 years ago (1934)
Opening date	November 1937; 87 years ago (1937)
Operator(s)	U.S. Army Corps of Engineers, St. Paul District
Dam and spillways
Impounds	Upper Mississippi River
Length	5,447 feet (1,660.2 m)
Reservoir
Creates	Pool 10
Total capacity	212,000 acre⋅ft (0.261 km3)
Catchment area	79,370 sq mi (205,600 km2)

The Friends of Pool 10 is a volunteer organization dedicated to the cleanup of the sloughs, backwaters and islands of the pool. Its first annual cleanup was in April 2007.^{[citation needed]}

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  Public Works Administration Project, Army Corps of Engineers, Dam.
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