I like history so I've been doing some reading. Construction was started on Lock E in January of 1918 and completed in the fall of 1922. Also in the fall of 1922 work was started on the dam portion and was completed in a few months. In 1933 congress approved the money to install wickets on several dams, E and F (Eddyville) included. With the wickets up the water level could be raised 3' (although it appears to me from the images they are 6-6 1/2' tall) they were primarily installed for flood control but also aided in navigation.
CSURP did all of the research and sent me a bunch of information on locks and dams on the Cumberland River. All I had to do was read and pick the info to post.
Thanks Chuck!
Scale models of the wickets.
Workers raising wickets, they were raised one at a time. A grappling hook would be thrown the water to catch the hook and then the wicket would be raised with a manual winch. I don't know what lock this is, it's constructed out of cut stone. E and F are concrete.
I'm going to guess the dark patches on top of the dam in these two images are where the wickets were attached.