Mossyrock Park is one of 4 day use/campground parks run by Tacoma Power. This one sits on the southwest side of Riffe Lake just above the Mossyrock Dam. It's a really lovely park. Lots of open space, playground, disc golf, dog park, beach area, concession stand, boat ramp, and several camping loops. The campground varied greatly in types of spaces and could accommodate tents up to fairly large RVs. We had a space in the Main campground that had 30 amp and water. The spot was paved with a picnic table and fire ring with a BBQ grate and a view of the lake through the trees. It was not very level though. We have an older 5th wheel that doesn't have a fancy auto leveling system so it took quite a bit of time to get everything level side to side and front to back. At one point, we had to hook back up to our truck to raise the front landing gear and add some blocks because we couldn't get the trailer low enough in the front. The spot really was nice though with plenty of space between spots. I do think we lucked out though because this was not the case in some of the other loops. Their spaces were a bit closer together. All in all, we did enjoy our time there. Our kiddo really liked the playground and getting ice cream at the concession stand after dinner. This park is family, dog, and fishing friendly. Many folks brought their boats right along with their trailers. We would camp here again sometime.