now when beavers build a dam and flood an area where is the high water mark? and if the beaver dam 'washes out' where is the high water mark
I've actually had this conversation on a project
A water boundary is ambulatory (it moves) but is has to be by the slow and imperceptible means of accretion and erosion or the natural rise and fall of water levels. Once it is sudden (storm, collapsed bank, etc.), water levels are controlled (by a dam or outlet) or artificial (fill, man made, or in your case beaver) then determining ownership to the water boundary doesn't count.
