John Martin Reservoir is huge and is a big draw for fishermen and boaters. There is some camping above the dam which is very basic and the main campground is located on Hasty Lake in a stand of Cottonwood trees. As you enter the Hasty location there is a dump station ahead on the left just after the turn into the campground. The first camping sites are on the right and shade is limited to metal pergolas. Continuing into the park you pass the bathroom with laundry and showers and take any of several loops to access your campsite. These are mainly under a dense cottonwood canopy. There are a few sites right on the shoreline of Hasty lake, which are quite popular and have great views across the small lake.
There is cellphone service, I don't recall if there is wood for sale, but campers did have fires. Sites have fire rings picnic tables. If you drive out of the park past the dump station and follow the road you arrive at a swimming beach and kayak launch area. The area is home to many birds including hawks, herons, and pelicans.