You can book this campground ahead of time with recreation.gov. I wanted to book at Crater Lake, but because the national park only has 2 campgrounds inside the park, I ended up booking at Diamond Lake, which was only 20 minutes away!

Loved our campsite. We booked site H021, which was close to restrooms, a water spiget, and a short walk to the water. The amenities were clean! The only problem we had were bees at our site when cooking, but besides that I'd come back!