Looking NNE from near upper gates of Lock No. 3
<p>This <a href="https://en.wikipedia.org/wiki/Lock_(water_navigation)" class="extiw" title="w:Lock (water navigation)">lock</a> is 145 feet long and 38 feet wide, with about a 13 foot lift.
The shrouded electric motor is one of a pair, each with cogs which engage notches on the beams attached to the lock gates, enabling them to be opened and closed.
The lock gates apparently have hydraulically-controlled openings below the waterline to let water in and out of the locks.
In foreground is a capstan which could be used to haul a vessel out of the lock.
Across the river is Cedar Creek Beach, in Owen County.
</p><p>From <a rel="nofollow" class="external text" href="http://finance.ky.gov/offices/kra/Pages/default.aspx">Kentucky River Authority</a>:
</p><p>Lock and Dam 3 were built from 1836-1842 and support a twenty three mile long pool of water.  The original dam was a timber crib structure, consisting of an outside frame of timbers filled with dirt and rock, and the original lock was stone masonry.  The structures are located forty two miles above the mouth of the Ohio River.  Lock 3 was shut down in 2007 because of mechanical and structural problems. 
</p><p>History:
1836-1842 Original construction of lock and dam
1882 Dam is rebuilt by the Corps of Engineers
Early 1890’s Concrete cap is added to the top of the timber crib dam (one drawing shows about two thirds of the timber crib dam is capped with concrete by 1911, with the rest still protected by wooden planks)
Approximately 1908 Concrete wall is constructed next to the abutment, opposite of the lock, running upstream approximately 70 feet
1941 Surface repairs to cracks and holes in the concrete cap are made
1977 New concrete is added to the crest of the dam, Surface repairs are made to cracks in the existing concrete cap on the dam, sheet pilling is added to the front of the dam
2005 Abutment, opposite of the lock, is repaired with rock armoring
</p><p>See also
<a rel="nofollow" class="external text" href="http://finance.ky.gov/about/Documents/KentuckyRiverNavigationCharts2011.pdf">Kentucky River navigation charts (2011 version, 5 MB PDF)</a>
and
<a rel="nofollow" class="external text" href="http://kgs.uky.edu/kgsweb/download/wrs/kynav1_6.pdf">Kentucky River navigation charts (1972 version, 19 MB PDF)</a>
and
<a rel="nofollow" class="external text" href="http://finance.ky.gov/offices/kra/Documents/KentuckyRiverDevelopment.pdf">Kentucky River Development: The Commonwealth’s Waterway by Leland R. Johnson and Charles E. Parrish (1999, 9 MB PDF)</a>
_____________________________
</p><p>Kentucky River mile 42 
Gest, Kentucky (in Henry County)
Mar. 1988
</p><p>file # 88c008
35 mm Kodachrome
Plustek OpticFilm 7600i
Siverfast 8
Picture Window 6
some sharpening (unsharp mask)
</p>
JPEG quality 95
<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/26171310324/">88c008: Kentucky River Lock No. 3 (looking downstream)</a>