Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? Old Pond Silt and Dam Failure

Omaha, I doubt that it was 30' deep from just beavers damming it up.

If it was, lets figure that it lasted 40+ years. So, that's filling in at a rate of 6" to 9" per year. How long you want the pond to last should dictate how deep it's dug. The deepest holes will fill in the quickest, so in the beginning the pond will get shallower at a quicker rate.