There are beavers on the Turalatin River National Wildlife Refuge. They do their thing building dams. There’s the saying, “Nature abhors a vacuum,” and evidently beavers abhor flowing water. The photo above is the only one I have of a refuge beaver, and it’s just its nostrils as it swam toward me.
My wife forwarded this link to me. It’s to a video from Canada where a photographer got a great video of a beaver family up-close and personal. It really gives an intimate look into how they work.