Depending on the loop, this is a nice site. Our reservation was for B2,3 which were down in a heavily treed section with no sun. We stayed here Memorial Day weekend so it was still sleeting and chilly. Camp hosts were very accommodating and moved us to B12, with sun and a view too. Campground was not full (likely due to Covid and travel restrictions in MT). It was quiet, spacious between campsites, especially B9-12. C loop was very nice as well. No designated tent site, we were able to pitch on grass. Fire ring and picnic table. Bathrooms were VERY clean, hand sanitizer was restocked daily.  Earthquake Lake is just down the road, but closed for Covid restrictions.

If this campground is full, you might try the dispersed camping that is also named Beaver Creek, on the N side of the road. Turn to Beaver creek, a dirt road that goes back 6 miles through a few trail heads. There are 6 spots, none bad but some better than others. If you find one, take it. Some people stay for many many days down here. Free.