| Melvin Price Locks and Dam | |
| Dam Crosses: | Upper Mississippi River |
| Res Name: | Pool 26 |
| Location: | Alton, Illinois / West Alton, Missouri, USA |
| Operator: | U.S. Army Corps of Engineers, St. Louis District |
| Dam Length: | 1160feet |
| Construction Began: | 1978 |
| Opening: | 1989 |
| Res Capacity Total: | 238000acre feet |
| Res Catchment: | 171470mi2 |
| Coordinates: | 38.8692°N -90.1536°W |
| Location Map: | USA Missouri |
Melvin Price Locks and Dam is a dam and two locks at river mile 200.78 on the Upper Mississippi River, about 17miles north of Saint Louis, Missouri. The collocated, explains the structure and its engineering.
Construction began in 1979, the main lock opened in 1990, and the full structure was completed in 1994. It replaced the earlier Lock and Dam No. 26, demolished in 1990, and is the first replacement structure on the Upper Mississippi River nine-foot navigation project. The main lock is 1200feet long and 110feet wide; the auxiliary is 600feet long and 110feet wide. The main lock has a vertical lift gate and a miter gate while the aux. lock has two miter gates. The dam is 1160feet long with 9 tainter gates, each 110feet wide by 42feet high.
It is named after Illinois Congressman Charles Melvin Price.