Looking WNW from 27th St. Bridge at McAlpine Locks.
<p>Corps of Engineers floating crane "Brown" lifting wooden dam wickets (probably Chanoine wickets), stacked atop a section of lock gate, from floor of 360-foot lock where they have been stored to keep them wet. They will be taken to Dam 52, near Paducah.
</p><p>So far as I know, dams 52 and 53 still (as of Jan. 2012) have Chanoine navigable passes as well as Bebout weir and "bear traps." See a <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/6791988641/in/photostream">diagram of various types of movable dam</a>.
</p><p>Before the construction of the current McAlpine Dam (1961-1964), the previous dam here at the Falls of the Ohio had a Chanoine navigable pass. See a <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/6792563873/in/photostream/">1934 chart of Locks and Dam 41</a>.
</p><p>Ohio River mile 607.
Louisville, Kentucky.
31-Mar-1999.
99c091.
.
</p>
Kodak Portra 400NC, 6x9 cm, Epson V500, Vuescan, medium infrared clean.
<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/6739091053/">99c091_8mp: Crane Brown lifting wickets from lock floor</a>