My experience has been at best, 30% of docks I've tried hold crappie, if that many. It seems most docks don't hold crappie rather than the other way around for sure. I try new docks all the time and sometimes find a good one. No dock holds them all the time though. I've loaded up on a dock and went back a couple of days later and not get bit. I seem to do better on the deeper water docks that are lower to the water. Like maybe less than 4 feet. Later in the year when the water cools down I've caught them on the outside of docks on the shady side, but not with the water this warm. I've been finding some good schools lately on the ledges though, 15 to 20 feet deep. I just drop a marker when they show up on the sonar and go back and catch them. Some days it's easy, some days it's not. You can try minnows. I never fish with them myself. If they're there, they will usually bite plastics on a 16th oz jig.