Found this campsite heading west on I-40 on a memorial day weekend road trip last minute. Had 40 designated campsites with about 1/2 reservable online and 1/2 first come first serve. They also allow dispersed camping along the lake and there were probably 50+ groups of people in RVs and trailers comfortably spaced.
Wild horses roaming around the lake were also pretty cool.
We took a designated campsite overlooking the lake and added this park to the list of places to return to.