Looking NNE from just above 600-foot lock at McAlpine Locks.
<p>Barge with <a rel="nofollow" class="external text" href="http://www.skylinesteel.com/globalnav/products/steel-sheet-piling/flat-web">sheet piling</a> and cofferdam cell template.
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The template, consisting of two connected rings, is used as a form for the construction of the cylindrical cells which make up the <a rel="nofollow" class="external text" href="https://bestengineeringprojects.com/cellular-coffer-dams-types-of-cellular-coffer-dams/">cofferdam</a>.
If necessary, the riverbed is prepared to provide a level surface, then the template is lowered into place and secured.
Interlocking sheetpiles are driven into the riverbed around the template, thus forming a cylindrical "cell".
After the template is removed, the cell is filled with sand, possibly after placing a <a rel="nofollow" class="external text" href="https://www.pdhonline.com/courses/g113/g113.htm">tremie concrete seal</a> at the bottom.
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"Cindy Brent" approaching 1200-foot lock with anhydrous ammonia barge.
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<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 23, 2001.
file # a1c051.
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</p>
Scanned from 6x9 cm Fuji NPS color negative, taken with Fuji rangefinder.
<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/28440409727/">a1c051: Cofferdam cell template and sheet piles at McAlpine Locks</a>