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2. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.

3. Chicago Harbor Lock - Wikipedia

   en.wikipedia.org/wiki/Chicago_Harbor_Lock

   The Chicago Harbor Lock, also known as the Chicago River & Harbor Controlling Works, is a stop lock and dam located within the Chicago Harbor in Chicago, Illinois at the mouth of the Chicago River. It is a component of the Chicago Area Waterway System , and is used to control water diversion from Lake Michigan into the river and for navigation.

4. Panama Canal locks - Wikipedia

   en.wikipedia.org/wiki/Panama_Canal_locks

   The gates at both ends of the upper chamber are doubled for safety. Miraflores locks Gate operating machine. The gates separating the chambers in each flight of locks must hold back a considerable weight of water, and must be both reliable and strong enough to withstand accidents, as the failure of a gate could unleash a flood of water downstream.

5. Kings Norton Stop Lock - Wikipedia

   en.wikipedia.org/wiki/Kings_Norton_Stop_Lock

   The wooden guillotine style gates are suspended in a slightly raked cast iron girder frame by a chain which passes through a small block on the gate. One end of the chain passes over two large wheels to a winch mechanism. The other end passes over two more large wheels to a hidden counterweight built into the side wall of the lock. [4]

6. Waterford Flight - Wikipedia

   en.wikipedia.org/wiki/Waterford_Flight

   These gates can be lowered to block additional flow of water from the Mohawk River through the locks to prevent damage during floods. [3] The locks have undergone periods of major restoration in recent decades, including replacement of lock doors and resurfacing of the concrete within the locks themselves.

7. Ballard Locks - Wikipedia

   en.wikipedia.org/wiki/Ballard_Locks

   Vessels passing from the freshwater Lakes Washington and Union to Puget Sound enter the lock chamber through the open upper gates (A in the accompanying diagram). The lower gates (B) and the draining valve (D) are closed. The vessel is assisted by the lockwall attendants who assure it is tied down and ready for the chamber to be drained.