Widows Bar Lock and Dam was a dam once located along the Tennessee River in Jackson County, Alabama, USA. It was situated 407 miles (655 km) above the mouth of the Tennessee River, near the river's confluence with Widows Creek. The dam was completed 8 September 1924, and was designed and operated by the U.S. Army Corps of Engineers. It was serviced by a 60-foot (18 m) by 265-foot (81 m) navigation lock.