After thinking about it a little more. I would almost have to Excavate vs impound. Because even if I create a huge wall the water would have to go high enough near the mountain of trees. One section is a very gradual steepness to it. I would need to raise the water to get the depth of the lake to just 4 feet which would result in the waterlogging of a lot of the trees.
Oh, well, I've always dreamed of running an Excavator...
