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.
Waterfalls can also be a symbol of cleansing, spiritual renewal, and removal of sin. The dream effect is to signify a time for oneself where one is able to wash away all negative emotional issues or events that have been plaguing them.