This data set describes wells (excluding observation wells) that are completed in the Arikaree aquifer and that were used to create a map of the generalized potentiometric surface of the Arikaree aquifer in the Pine Ridge Indian Reservation and Bennett County. Water levels in the wells were measured by a variety of people including the well drillers and U.S. Geological Survey personnel. The water-level data for this data set are based on the most recent measured value for the well through 2006. The range n water-level data for this data set was from 1929 to 2006. All water levels were retrieved from the U.S. Geological Survey's NWISWeb database at http://nwis.waterdata.usgs.gov/sd/nwis/gwlevels.