Loved our weekend at Middle Fork!
We had one of the group campsites, and very easily fit 9 people. Toilets were very well maintained and the host was selling firewood.
The river is only a five minute walk away, and we spent most of one day there. I was very surprised by how quiet it was for only being an hour outside of Seattle. The campground also had access to the CCC trail.
The water pump was broken when we were there, so had to pack in all of our water.