Evans Plunge Mineral Springs is an all-natural, mineral spring-fed pool in Hot Springs, South Dakota. Built in 1890 over multiple mineral springs, it features naturally 87-degree water for swimming, splashing, and soaking. Known as the oldest tourist attraction in the Black Hills, Evans Plunge has long been associated with the area’s warm mineral waters and is being revitalized by the City of Hot Springs as a health and wellness destination for guests of all ages.