The Holt Lock on the Black Warrior River in Holt, Ala., has reopened after being closed earlier this year due to concerns about its structural stability.The U.S. Army Corps of Engineers closed the lock on June 22 after the Mobile District engineering team conducted an initial stability analysis that identified cracks and leaks in the lock's infrastructure."The analysis, which utilized known data and certain assumptions, revealed critical stability issues with the monolith structure of the Holt Lock," the Corps said at the time of the closure.