If you read Jessica's review with the GPS coordinates above, those will take you to the Richland Reservoir site. There is a listing for that separate. The coordinates on the end of this listing take you to a field. You can camp off most roads no further than 30ft in a vehicle, RV or trailer. Be aware that there is private land in here too. Best to stop in the ranger station in Pierre to the north and ask. They are very helpful.