We visited the Dinosaur National Monument on a weekday in May. The campground was not even half full, so we had our choice of sites. It was $18 for our RV, with no hookups, on the Green River. There were flush toliets and the sites were large and secluded. Beautiful!!
The campground is right along the Green River. The site 33 was a pull-off site and very pleasant and level. We had decent Verizon. This campground is close to the Dinosaur exhibits. We also went to the other side of the NM, in Colorado, and really enjoyed it, especially the Harper Corners Trail and Echo Park Road. We also had time to visit Flaming Gorge NRA and recommend a visit.