Lake Desmet (South Dam) in Wyoming is a vital water supply source with a storage capacity of 234,987 acre-feet and a surface area of 2,653 acres. Completed in 1975, this earth dam stands at a height of 80 feet and has a structural height of 120 feet, serving the purpose of water supply for the local government in Ucross. The dam is regulated, inspected, and enforced by the Wyoming State Engineer's Office, ensuring its safety and functionality.

Located on the Piney and Rock Creek rivers, Lake Desmet (South Dam) has a high hazard potential and a fair condition assessment as of the last inspection in July 2019. The dam features an uncontrolled spillway with a width of 200 feet and a maximum discharge capacity of 8,520 cubic feet per second. With a moderate risk assessment rating, the dam's emergency action plan (EAP) status and risk management measures are currently under review, highlighting the importance of ongoing monitoring and maintenance to ensure the safety of the surrounding community and water resources.

Managed by the local government, Lake Desmet (South Dam) plays a crucial role in providing water supply for the region while also posing potential risks that require proactive management. With Liz Cheney representing the Congressional District in Wyoming where the dam is located, stakeholders and authorities must work together to ensure the dam's integrity, emergency preparedness, and risk mitigation strategies are up to date and in line with regulatory standards to safeguard both the environment and the community.