Arkansas has a law allowing fair access to navigatable waters. This states that if you can get to the water through public access, and navigate the water, you can go anywhere. This means water under the docks. So long as you are not on the docks, tied to the docks, or holding onto the posts, you are not tresspassing, and therefore have all legal rights to fish it. I tell you this from experience, we were talking with a warden one afternoon about some guys duck hunting in a field with us, and since they were coming into our field from the river, there was nothing we could do untill they dropped an anchor, tied to a tree, or got out and walked across the field. As long as they were in a boat floating around, it was perfectly legal.