Looking E from below 600-foot lock at <a rel="nofollow" class="external text" href="https://www.lrl.usace.army.mil/Missions/Civil-Works/Navigation/Locks-and-Dams/McAlpine-Locks-and-Dam/">McAlpine Locks</a>.
<p>Construction of <a rel="nofollow" class="external text" href="https://bestengineeringprojects.com/cellular-coffer-dams-types-of-cellular-coffer-dams/">cellular cofferdam</a> around old 360-foot and 600-foot locks before they are replaced by new 1200-foot lock.
Ready-mix trucks and <a href="https://en.wikipedia.org/wiki/Concrete_pump" class="extiw" title="w:Concrete pump">concrete pumps</a> at upper right.
<a href="https://en.wikipedia.org/wiki/Concrete" class="extiw" title="w:Concrete">Concrete</a>  is pumped through two pipes (hard to see in this photo) which run down slope and across to 1200-foot lock, supported by barges.
There it is pumped into one of the cells that make up the <a href="https://en.wikipedia.org/wiki/cofferdam" class="extiw" title="w:cofferdam">cofferdam</a>.
New fence under construction in foreground.
.
<a href="https://en.wikipedia.org/wiki/Ohio_River" class="extiw" title="w:Ohio River">Ohio River</a> mile 607.
<a href="https://en.wikipedia.org/wiki/Louisville,_Kentucky" class="extiw" title="w:Louisville, Kentucky">Louisville, Kentucky</a>.
March 13, 2001.
file # a1c024.
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</p>
6x9 cm E-6 transparency, taken with Fuji GW690 II (90 mm lens) or Fuji GSW690 III (65 mm lens).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/28033591647/">a1c024: Construction of cellular cofferdam at McAlpine Locks, Louisville</a>