| Lock and Dam No. 5 | |
| Location Map: | Minnesota |
| Dam Crosses: | Upper Mississippi River |
| Res Name: | Pool 5 |
| Location: | Winona County, Minnesota / Buffalo County, Wisconsin, United States, Near Minnesota City, Minnesota. |
| Operator: | U.S. Army Corps of Engineers, St. Paul District |
| Dam Length: | 1619feet(movable portion) |
| Opening: | May |
| Res Capacity Total: | 106600acre feet |
| Res Catchment: | 58845mi2 |
| Coordinates: | 44.1611°N -91.8108°W |
Lock and Dam No. 5 is a lock and dam located in Buffalo County, Wisconsin and Winona County, Minnesota on the Upper Mississippi River around river mile 738.1. It was constructed and placed in operation May 1935. The site underwent major rehabilitation from 1987 through 1998. The dam consists of concrete structure 1619feet long with six roller gates and 28 tainter gates and an earth embankment 18000feet long. The lock is 110feet wide by 600feet 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.