Stayed at Prosser Campground for 4 nights and couldn’t get 4 more reserved. Granite Flats had availability so we reserved our site online. Drove over to check it out and canceled. No way our 30’ travel trailer would fit in the site and super close to another site. Charged $18 cancellation fee for a site we couldn’t fit into in spite web site information. Glad we were able to check it out ahead of time. Be prepared for a lot of road noise and close sites. Access road not very good and other entrance gate locked. If you can get a site near the river you might be happy.