Hell Creek is a state park, so the best people to talk to would be someone with Fish, Wildlife and Parks. They are closely monitoring the situation and have staff on site. Ph # 234-0900
As of right now, they are telling people that most camp sites are under water except for the ones in the main campground area. The main campground area does includes the electrical sites, which the vast majority do require a reservation. They are also having problems with the water system right now. There is only water available in the shower house for a few hours in the morning and evening. Folks are advised to bring their own drinking water.