I netted some nice alewives up that way last Sunday basically across the main lake from the mouth of wolf creek because it is more flat over there and an anchor will hold. I was in about 50' of water. Other depths plus or minus 20 may work too. Just look on your graph for bait that is showing from about the surface to ten or fifteen feet as you idle around with your big motor looking for a spot to anchor. From now through the rest of the summer I'll just look for most convenient spot on the main lake for where I want to fish that an anchor will hold, is out of the wind and has the bottom depth needed for that time period and I figure that out the night before.
I have a hydroglo and it was 2 feet under the surface. It took about 30 minutes for the graph to look really good and yellow.
Good luck. You will probably do fine.