Take your yak to the dam and put 2-3 jigs on you rod or rods. Just drift along with them at varying depths to find where they are and what depth. When you catch one or more drift the area again. There is almost no cover on the lake and they will suspend a lot. Near the dam it gets up to about 23 feet. Orange/chartreuse and black/chartreuse work great. If you have a fish finder and mark ANYTHING on the bottom, it will hold fish 365 days a year. Watch out for big channel cats that will readily take your jigs.
If that doesn't work try going off Winfrey Point and fan casting for suspended fish at 3-8ft down. Peg bobber or you can cast and jig it on the bottom like you would a spoon.
Eric