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2. John Day Dam - Wikipedia

   en.wikipedia.org/wiki/John_Day_Dam

   The dam underwent a major repair to the upper lock gate in 2010, as documented in an episode of the National Geographic Channel program World's Toughest Fixes. [9] As of 2007, the 76-mile-long reservoir formed the deadliest stretch of the Columbia River for migrating young salmon. The reservoir is the longest lake on the Columbia that young ...

3. 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.

4. Lever tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Lever_tumbler_lock

   A type of lock pick used to pick lever tumbler locks. Lever tumbler locks can be picked with a tool called a curtain pick which is inserted into the keyway of the lock, and a force is applied to the locking bolt. The pick is then used to lift each lever inside the lock to the correct height so that the locking bolt can pass.

5. Caisson (lock gate) - Wikipedia

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

   Most locks are closed by chevron or mitre gates rather than by caissons. These are pairs of hinged gates that form a "V" shape, with the deeper water outside the V. Water pressure thus holds them closed. These gates can be opened and closed quickly, so they are used for canal locks, to change levels, and also for most freight docks.

6. Floating dock (impounded) - Wikipedia

   en.wikipedia.org/wiki/Floating_dock_(impounded)

   In 1715 the first commercial wet dock, Liverpool's Old Dock, opened. [2] Early docks were of simple construction: a single lock gate isolating them from the tidal water. The gates were opened during the last hour [or two] of the rising tide, giving a short window of opportunity to let ships in on the rise and releasing outgoing ships while the tide was on the t

7. Locks on the Chesapeake and Ohio Canal - Wikipedia

   en.wikipedia.org/wiki/Locks_on_the_Chesapeake...

   Filling the lock through culverts eliminated that problem, as well as putting the lock gate below the breast wall. Lock 27 is a curious combination of the two specifications, having the culverts inside the masonry, but the upper gate below the breast wall. This is because of multiple contractors working on the lock after a lapse of time. [27]