Who to call about beaver dams?

We are new here and part of Manzanita creek runs through the south part of our property. We have some beavers who have built a few major dams that are starting to make the creek back up (15-20’) to almost our driveway.

I’m about to put on some waiters and break it all up myself but thought I would ask. The county (I think) has put a contraption on the property in the creek to protect them damming up the whole creek but they are building it up stream of that, creative little beasts!