Beavers cannot haul heavy tree loads over land. However, I have encountered a beaver swimming across a 500-acre lake while towing a full 25' tall tree.

Beavers will eat the tasty trees. Beavers will use the handy trees right at the edge of the water for their construction projects.

As soon as your pond level goes up enough to send some water through your overflow pipe, I predict the beaver(s) will quickly block that water flow.

They are amazingly dedicated creatures to what THEY consider to be a priority!