This is the second time I've camped at Mossyrock Park, 1st time in a group camp. There are 2 group campsites. G1 is only for tents. G2 will accommodate tents and RVs. We were in G2. It does look a little lack luster at first glance. G2 is a large gravel lot with 12 narrowly spaced picnic tables, grassy areas on the perimeter, and a large firepit at one end. There are no hook-ups, but there is a water spigot for the group campsite and bathrooms with showers near-by and a kitchen shelter. I did not use the bathrooms so can not comment on those and I'm not sure if we would have been able to use the kitchen shelter or if that was a separate reservation. Our group was originally to be full with all 12 parties attending, but 2 parties ended up canceling. We also had people arriving on different days and leaving early. The full booking was for Thursday-Monday over Memorial Day weekend. We had almost every manner and size of equipment there as well from a 5th wheel, various size bumper pulls, a truck camper, class A motorhome, and tents. It was a bit tight once more people started showing up so bringing a larger rig in once people are in there could be hard to do. One of the parties that brought their boat would actually back in from the entrance since it would have been hard to get in and turn around. Since it was a holiday weekend, the park was pretty full, but I couldn't really tell from where we were. It was surprisingly quiet in G2. The consensus was that people enjoyed the trip and would like to do it again next year.
I have Verizon and was able to call and text my husband and occassionally use messenger. I had one or two bars. Probably would have been better with a cell booster.