I know you really are not supposed to leave trees on a dam, but this may be a different story. My pond uses an old 75' wide railroad berm along one side to hold water. Would it be okay to leave trees on it? No tree is over 4" yet. The fish sure love all of the critters that fall out of the brush there and it is very steep sided so tree debris would be less of a problem than dirt from erosion. Since I will be clearing the other part of the dam of trees next weekend, I figured I should find out if I need to do it all.