I don't think you need to go quite that deep. If you can drop in 45 to 50', make sure the bamboo is tall, like 15 to 20' tall. Crappie will susbend in the top during summer and winter. You can titeline over the brush and fish 30' deep. My secret is to wire a plastic jug to the top of the bundle of bamboo so it stands straght up off the bottom. You can get off to the side and fish all the way to the bottom. For a real treet, set up some lights during the hot summer and fish this with lights, you can see the fish come up with a good sonar.
I don't fish because I want to, I fish because I HAVE to !
Moma tried real hard.