Holt Lock and Dam, Lock and dam complex in Tuscaloosa County, US.

Holt Lock and Dam is a navigation lock and dam on the Black Warrior River near Holt in Tuscaloosa County, Alabama. The lock sits on the southern bank, with a chamber 110 feet (34 m) wide and 600 feet (180 m) long and a maximum lift of 64 feet (20 m). Fourteen individually operated tainter gates control the spillway and the lake level, and hydroelectric turbines run on the northern bank.

The Holt Lock and Dam opened to navigation in 1966, replacing a series of locks and dams built on the Black Warrior River in the early 20th century. It impounds Holt Lake for 19 miles (31 km) upstream to the John Hollis Bankhead Lock and Dam.

Holt Lake, formed behind the dam, serves as a popular destination for local fishermen and boaters throughout the year. People gather here for leisure activities and to enjoy time on the water.

The lock sits on the southern bank of the Black Warrior River near Holt, about 12 km east of Tuscaloosa, with the dam's 14 tainter gates and the Alabama Power turbines on the northern bank. Vessels are raised or lowered up to 64 feet (20 m) inside the 110-by-600-foot chamber, so the lock is the place to watch a towboat and its barges work through. Holt Lake backs up 19 miles (31 km) to the John Hollis Bankhead Lock and Dam.

Alabama Power Company operates hydroelectric turbines here while the US Army Corps of Engineers manages dam operations. This shared responsibility shows how two organizations work together on infrastructure and power generation.