<a href="https://en.wikipedia.org/wiki/Dredging" class="extiw" title="w:Dredging">Dredging</a> below <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>Closeup of cutterhead of <a href="https://en.wikipedia.org/wiki/Dredging#Cutter-suction" class="extiw" title="w:Dredging">dredge</a> "Bill Holman".
(Apparently some debris is caught in the teeth).
The cutterhead is in front of the intake, so as it rotates, dislodged material is sucked up and pumped via a floating pipeline to a location often hundreds of yards away.
The starboard anchor cable can be seen dropping into the water.
</p><p>See a <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=MsPbGXwad0w">video about cutterhead dredges</a> from the European dredging company <a rel="nofollow" class="external text" href="https://www.jandenul.com/en/equipment/fleet/cutter-suction-dredger">Jan De Nul Group</a>
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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>.
July 24, 2002.
file # a2g090.
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IMG_0315.
</p>
Canon PowerShot A40 digital camera.
<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/42207111295/">a2g090: Cutterhead of dredge Bill Holman</a>