Well-situated between Seattle and the mountain loop
Stopped through here on a trip around the mountain loop. This is in a great location being accessible from the city but near all the great trails in the area. The campground features running water/flush toilets and has access to the river (which was much too cold for us to swim in but I imagine this is a thing). The scenery is pleasant but it's right near the road so keep that in mind. We didn't have too much issue with this, though some sites are closer to it than others.
On a Sunday in early June, folks were still able to get walk-up sites at lunch time.