I have a large power right-away going through my property that once had a small pond at the bottom maintained by beaver. The beaver eventually left and/or went missing by some means and their damn eventually collapsed and the pond became a small swamp.
Due to power company clearing neglect and messes, I took action, complained and they then came to clear and cleaned up my complaints.
Working with the company that did the cleanup, we came up with a plan to reclaim the pond. Follows is a pic of swamp left behind and in existence for at least 15 yrs and the overgrown right-away, top center of the photo.