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2. Lock (water navigation) - Wikipedia

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

   The boat enters the lock. 8–9. The boat enters the lock. 3. The lower gates are closed. 10. The upper gates are closed. 4–5. The lock is filled with water from upstream. 11–12. The lock is emptied by draining its water downstream. 6. The upper gates are opened. 13. The lower gates are opened. 7. The boat exits the lock. 14. The boat exits ...

3. Lake freighter - Wikipedia

   en.wikipedia.org/wiki/Lake_freighter

   [citation needed] Poe Lock at the Soo Locks is the largest deep lock at 1,200 feet (370 m) long and 110 feet (34 m) wide. [ 38 ] Many of the larger American ships are unable to navigate the locks of the St. Lawrence Seaway, which restricts vessel size to 740 feet (230 m) in length and 78 feet (24 m) in breadth. [ 39 ]

4. Ballard Locks - Wikipedia

   en.wikipedia.org/wiki/Ballard_Locks

   Salt water began to make its way upstream toward Lake Union, requiring a system of siphons and flushing mechanisms. Because the Cedar River was the main water source both for the lakes and locks and for Seattle's potable water, at times there were problems maintaining an adequate water supply to maintain lake level and operate the locks.

5. 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.

6. Caisson (lock gate) - Wikipedia

   en.wikipedia.org/wiki/Caisson_(lock_gate)

   A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow it to be towed clear of the dock. Graving docks at Birkenhead, closed by a variety of ship caissons and floating (sliding) caissons.

7. Caisson lock - Wikipedia

   en.wikipedia.org/wiki/Caisson_lock

   Caisson lock. The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower ...