Howell Heflin Lock and Dam, Navigation lock and dam on the Tennessee-Tombigbee Waterway near Gainesville, Alabama, US

Howell Heflin Lock and Dam is one of four lock and dam structures on the Tennessee-Tombigbee Waterway, lying along the original course of the Tombigbee River near Gainesville, Alabama. It impounds Gainesville Lake and is named for Howell Heflin, a former U.S. Senator from Alabama.

The Howell Heflin Lock and Dam was originally built as the Gainesville Lock and Dam, one of four lock and dam structures on the Tennessee-Tombigbee Waterway, which generally follow the original course of the Tombigbee River. It stands near Gainesville, Alabama, and was later renamed for Howell Heflin, a former U.S. Senator from Alabama.

The dam and its lock carry the name of Howell Heflin, a former U.S. Senator from Alabama; the structure was previously called Gainesville Lock and Dam after the nearby town. The lock and dam lie near Gainesville, and the reservoir it impounds is named Gainesville Lake.

Visitors can view the structure from multiple vantage points along the river, especially from the road that crosses the dam. Daytime visits work best to observe the lock operations and watch how boats move through the water levels.

The dam is named for Howell Heflin, a former U.S. Senator from Alabama; before the renaming it was known as Gainesville Lock and Dam, after the nearby town. It is one of four lock and dam structures on the Tennessee-Tombigbee Waterway that generally follow the original course of the Tombigbee River.