Porcupine, also known as Enlarged Porcupine-5866r, is a private-owned dam located in Converse, Wyoming, along Porcupine Creek. Built in 1979 for irrigation purposes, this earth dam stands at a height of 35 feet with a hydraulic height of 30 feet and a structural height of 35 feet. It has a length of 1450 feet and a storage capacity of 865 acre-feet, providing vital water resources for the surrounding area.

Despite its importance for irrigation, Porcupine Dam is in poor condition and has a low hazard potential. It is regulated by the State of Wyoming and undergoes regular inspections every 5 years to ensure its safety and functionality. The dam features an uncontrolled spillway with a width of 200 feet and an outlet gate for controlled water release. While its risk assessment is moderate, there are currently no emergency action plans in place for the dam.

Situated in a picturesque location near Edgemont, SD, Porcupine Dam plays a crucial role in water management for the region. Climate and water resource enthusiasts will find this structure fascinating for its historical significance, engineering design, and impact on the local ecosystem. Further monitoring and maintenance efforts are necessary to ensure the long-term sustainability of this important water resource infrastructure.