Middle No. 1, located in Converse, Wyoming, is a privately owned Earth dam built in 1962 for irrigation purposes on Middle Cow Creek. Standing at a height of 17 feet with a hydraulic height of 12 feet, this dam has a storage capacity of 246 acre-feet and a surface area of 20 acres. Despite its low hazard potential, the dam's condition assessment in 2019 was deemed unsatisfactory, indicating a need for maintenance and improvements to ensure its safety and functionality.

With a spillway width of 105 feet and an uncontrolled spillway type, Middle No. 1 has one slide gate for outlet control. Although it has a moderate risk assessment rating of 3, the dam has not undergone any modifications or updates in recent years. It is important for water resource and climate enthusiasts to monitor the condition of Middle No. 1 and advocate for necessary repairs and risk management measures to prevent any potential hazards or failures in the future. The dam is under the jurisdiction and regulation of the State Engineer's Office, highlighting the importance of state oversight in ensuring the safety and integrity of water infrastructure in Wyoming.