Twin No. 1 is a privately owned earthen dam located in Clearmont, Wyoming, along the Betz Draw river. Completed in 1957, this dam serves multiple purposes including fire protection, stock watering, and small fish pond. With a height of 47 feet and a hydraulic height of 42 feet, Twin No. 1 has a storage capacity of 60 acre-feet and a surface area of 3 acres.

Despite its low hazard potential, Twin No. 1 is currently in poor condition as of the last inspection in June 2017. With an inspection frequency of 5 years, the dam's risk assessment is moderate, indicating a need for potential risk management measures. The dam has an uncontrolled spillway and no outlet gates, presenting challenges for proper water management and emergency response.

Located in a scenic area of Johnson County, Wyoming, Twin No. 1 plays a crucial role in water resource management and ecosystem support in the region. As a key infrastructure for fire protection and livestock watering, the dam's condition and maintenance are essential for ensuring the safety and sustainability of water resources in the area.