Dreaming about a waterfall may be reflective of the current state you are in. It symbolizes that your mind is full of great imagination and vitality. Eventually, this would lead to an outburst of creative energy.
However, if you envision yourself on a boat in your dream going over the waterfall, it means that you feel like you lack control. It may also mean that there are too many things in your life which are overwhelming you and consuming all your time and effort. A waterfall in your dream may be representative of the fact that you are letting go of something. No matter how hard you try to hold onto water in your hands, it will always slip through your grasp. Therefore, a waterfall in dream is symbolic of letting go.Guide and Resources on Waterfall in Dreams