I was on a Woodland Caribou trip with Ben. We were going up a long winding creek. I was moving a little faster so when I got to a down tree I would make a passage way for us.  There was a large tree about 4 feet above the water with limbs sticking down into the water.  A beaver was trying to take advantage of it to start a dam.  I pulled a couple of sticks out and then started cutting some of the vertical limbs that were like bars blocking our way.  The beaver not only smacked his tail but through water on me several times.  I got through just as Ben was coming around the corner and I took off.  At the next obstacle Ben caught up and make some kind of comment about me making that beaver mad.