Agnes is a privately-owned irrigation dam located in Natrona, Wyoming, near the Big Muddy Oil Field. Completed in 1952, this Earth-type dam stands at a height of 25 feet and has a hydraulic height of 21 feet. With a normal storage capacity of 37 acre-feet and a maximum storage of 63 acre-feet, Agnes primarily serves the purpose of irrigation for the surrounding area. The dam spans 865 feet in length and has a spillway width of 30 feet, with a low hazard potential and a poor condition assessment as of the last inspection in 2017.

Situated on Skeen Creek, Agnes plays a crucial role in water resource management in the region, providing essential irrigation water for agricultural activities. Despite its poor condition assessment, the dam is regulated and inspected by the state regulatory agency in Wyoming, ensuring its safety and functionality. With its moderate risk assessment rating and the presence of a single valve outlet gate, Agnes stands as a key infrastructure for water storage and distribution in the area.

While Agnes faces maintenance challenges and a poor condition assessment, its importance in providing irrigation water for agricultural needs cannot be understated. As a vital piece of water infrastructure in Wyoming, the dam's role in supporting local agriculture and the surrounding ecosystem highlights the significance of sustainable water resource management in the face of changing climate conditions. The ongoing monitoring and enforcement of inspection and safety protocols by the state regulatory agency are crucial to ensuring the continued operation and safety of Agnes for the benefit of the community it serves.