- When in Lewistown Heights, Montana, you have a few options for dumping your RV waste.- Convenient dump stations include RV & Mini Storage, Pierce RV, Big Sky Campground, and Cabela's.- These locations provide facilities for dumping black water and gray water, as well as access to fresh water for flushing tanks.- You can also find RV trash bins at these sites for easy disposal of any additional waste.- Whether you're passing through or staying in the area, these dump stations offer convenient and necessary services for RV waste disposal.