What was said above. This also works for dams that are running parallel to the the current. There's a lake I fish with a submerged north/south running dam and retrieving a crankbait over the dam in the direction of the current can get your arm yanked. Crankbaits that run deep enough to deflect off the dam are best. Also had luck with jerkbaits in these situations and some with creeping a drop shot up and over, but the crankbait works best.
Remember that 10-15ft diving crankbaits reach their maximum depth about half way into the retrieve, then start rising again.