We were able to score a couple of nights here in Early May.  It's a very popular Oregon State Park and I'm sure summer requires advance planning.  The weekend we were there was pretty full and our site was at the top of the B loop.  Monday, however, the park cleared out to much fewer campers.   The lake was actually mostly full and the views were beautiful.   Some of the amenities were boating, of course, lake views from some sites, a nice dog park along with the normal state park fare.  We'll definitely make another trip!