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| Lock and Dam No. 4 | |
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Mississippi River Lock and Dam No. 4
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  Location of Lock and Dam No. 4 in Wisconsin | |
| Location | Alma, Buffalo County, Wisconsin / Greenfield Township, Wabasha County, Minnesota, United States. |
| Coordinates | 44°19′32″N 91°55′13″W / 44.32556°N 91.92028°W / 44.32556; -91.92028 |
| Construction began | 1932; 92 years ago (1932) |
| Opening date | May 1935; 89 years ago (1935) |
| Operator(s) |  U.S. Army Corps of Engineers, St. Paul District |
| Dam and spillways | |
| Impounds | Upper Mississippi River |
| Length | 1,367 feet (416.7 m) (movable portion) |
| Reservoir | |
| Creates | Pool 4 |
| Total capacity | 878,000 acre⋅ft (1.083 km3) |
| Catchment area | 57,100 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.
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.
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