River locks are engineering structures used to overcome changes in elevation along a river. They are used to raise or lower boats between different levels of water, allowing them to navigate through a river system that would otherwise be inaccessible. River locks typically consist of a chamber with gates at either end. When a boat enters the chamber, the gates are closed, and water is either added or removed to raise or lower the boat to the desired level. Locks are an essential part of many river transportation systems and have been used for centuries, allowing boats and ships to transport goods and people across vast distances.
Drain down and Full Structural/Mechanical Inspection of the Lock Structure and Gates.