Lock and Dam No. 4
Mississippi River Lock and Dam No. 4
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| Location | Greenfield Township, Wabasha County, Minnesota / Alma, Wisconsin, USA |
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| Coordinates | 44°19′32″N 91°55′13″W / 44.32556°N 91.92028°WCoordinates: 44°19′32″N 91°55′13″W / 44.32556°N 91.92028°W |
| Construction began | 1932 |
| Opening date | May 1935 |
| Operator(s) | United States Army Corps of Engineers |
| 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 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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