We spent 3 nights here July 19-22. The facilities were adequate and clean. 3 minutes per token for the showers. The sites are pretty well spaced which was nice. It is very shaded which is good if it's hot but not so good if you are counting on solar.

The campground is located directly across hwy 504 from the Mt Saint Helen's visitor center. There is even a walking tunnel under the hwy from the campground.

The general discription here in thedyrt says there is wifi. There is no wifi in the park. We had extended Verizon service. So we could text usually and even in a few spots could make a call but no data access.

The nearest data connection we found was back towards Castle Rock / I-5 3 or 4 miles. The downtown area of Castle Rock is a pretty nice place with a couple pubs and a few restaraunts and a small grocery store. 

I would recommend avoiding the loop of sites 55-76. They are the closest loop to the hwy and the hwy noise is very noticable.