I'm not sure how much you have in the way of information regarding the Walls of Jericho, but here is a good bit of information from
The Nature Conservancy that may be helpful. Also, here is a bit of information from
Outdoor Alabama that may be able to fill you in a bit too.
In regards to the water situation, I had always been told that the water was lower beginning in September and usually stayed low until early spring of the following year, so with this drought, I'm really unsure on the situation. Sorry, I'm not much help w/ the water, but maybe you can use some of what I did show you to get you headed in the right direction.
From one of the articles, I found a phone # for the Tennessee Wildlife Resources Agency (TWRA) - 615-781-6622 or toll-free 1-800-624-7406. I'm sure they may be able to help out as well.