My location for a Mountain beaver

I'm 99% sure this is a mt. beaver hole, but will know for sure in a month if I'm lucky. This is a good find because its in the blast zone of Mt. St. Helens and it will show that they survived the blast on the back side of a ridge very close to the mountain. This is within my study area that I go into during the summer and fall to learn about the survival of smaller animals after the eruption. I've seen lots of chipmunks and mice and the wild flowers have made a great comeback to reseed the landscape and provide food that's needed for the smaller animals.