Head out of Bolles, after you pass the really shallow stuff head SE. It's a very large area with lots of humps etc averaging 17ft for the most part. I do know one hump is only 4 ft deep. But most average probably 9ft. You really can't miss the grds as boats fish that area all year long. Some times you can only drift as it can get nuts trying to troll out there. Also in the inside ( west side ) of the grds there are 2 markers. These can be good for walleye and or perch and not as crowded as out farther. Make sure you save plenty of waypoints out there.