South Rockwell Lake in Dumont, Minnesota, is a state-regulated water resource located along the Twelvemile Creek West Branch-TR. This earth dam, with a height of 12 feet, provides a storage capacity of 100 acre-feet and covers a surface area of 287 acres. Despite its low hazard potential, the dam's condition assessment is rated as poor, with the last inspection in August 2019 revealing the need for maintenance and improvements.

Owned and regulated by the Minnesota Department of Natural Resources, South Rockwell Lake serves a primary purpose classified as "Other." Although its design features buttress core types and an unlisted or unknown foundation, the dam has not undergone modifications since its completion. With a drainage area of 1.2 square miles, this lake plays a crucial role in managing water resources in the Big Stone County area. Enthusiasts of water resources and climate will find South Rockwell Lake an intriguing site for exploration and study, given its unique characteristics and importance in the local ecosystem.