This particular spot was the only one within 50 miles of Cody WY in July, so my friend and I booked it.  It was a wonderful spot to camp.  The site has a ton of tables and a good size fire pit.  I liked the brook being so close and the shade we got from the pine forest.  I think it would be pretty tight for 150 people, but there is parking areas and spots for RVs so it might work.  The camp host was very nice and helpful.  Apparently we would have been able to walk in and ask to camp since it was just the two of us and we were in a tent and avoided the $50 fee.  Overall we were very happy about the site and the proximity to the parks, hiking, the towns (Victor and Driggs), and Cody.