Lock and Dam No. 4

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Lock and Dam No. 4
Lock and dam 4 aerial.jpeg
Mississippi River Lock and Dam No. 4
Lock and Dam No. 4 is located in Wisconsin
Lock and Dam No. 4
Location of Lock and Dam No. 4 in Wisconsin
LocationAlma, Buffalo County, Wisconsin / Greenfield Township, Wabasha County, Minnesota, United States.
Coordinates44°19′32″N 91°55′13″W / 44.32556°N 91.92028°W / 44.32556; -91.92028Coordinates: 44°19′32″N 91°55′13″W / 44.32556°N 91.92028°W / 44.32556; -91.92028
Construction began1932; 87 years ago (1932)
Opening dateMay 1935; 84 years ago (1935)
Operator(s)United States Army Corps of Engineers logo.svg U.S. Army Corps of Engineers, St. Paul District
Dam and spillways
ImpoundsUpper Mississippi River
Length1,367 feet (416.7 m) (movable portion)
CreatesPool 4
Total capacity878,000 acre⋅ft (1.083 km3)
Catchment area57,100 sq mi (148,000 km2)

Lock and Dam No. 4 is a lock and dam located near Alma, Wisconsin and Kellogg, Minnesota on the Upper Mississippi River around river mile 752.8. 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&dam 4.jpg


Dam photographed from Wisconsin Highway 35

The lock and dam was constructed and placed in operation in May 1935. There were ten major injuries and three deaths recorded during construction of the facility. Its last major rehabilitation was from 1988 to 1994.

An old photograph dated September 1935 and captioned "Photograph of crowd onshore assembled for Alma, WI dam dedication."

See also[edit]


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Locks and dams of the Upper Mississippi River
Lock and Dam No. 3
Lock and Dam No. 5