- When traveling near Hurley, South Dakota, you can find several options for dumping your black and gray water, including fresh water and a hose for flushing tanks.- Some of the popular dump stations in the area are at the Pilot Travel Center in Sioux Falls, Flying J Travel Center in Sioux Falls, and the KOA Journey in Sioux City.- Other convenient locations include Cabela's in Mitchell and Lewis and Clark Recreation Area near Yankton. - Most of these dump stations also offer trash bins for the disposal of waste.