When I'm scouting an unfamiliar lake and find a deep hump that looks promising, I'll spend quite a bit of time checking it out with my graph before dropping a line overboard. Late-fall walleyes often hold in very tight schools, so it's easy to miss them. The best way to graph a likely piece of structure is to start shallow and gradually work deeper. For example, if you find a hump that tops off at 30 feet and slopes down to 50 feet before the bottom flattens out, first crisscross it at the 30-foot crown. Then maneuver your boat to explore the deeper water, stepping down about two feet at a time and following each contour all the way around the piece of structure.