Nicolaysen Dam, located in the Big Muddy Oil Field of Natrona, Wyoming, is a privately owned structure primarily used for irrigation purposes. Completed in 1899, this Earth-type dam stands at a height of 22 feet and has a storage capacity of 475 acre-feet, with a normal storage level of 330 acre-feet. The dam spans a length of 1500 feet and is situated on the Dry Muddy Creek, within the jurisdiction of the Wyoming State Regulatory Agency.

With a significant hazard potential and fair condition assessment as of 2017, Nicolaysen Dam poses a moderate risk according to a risk assessment evaluation. It features an uncontrolled spillway with a width of 4 feet and an outlet gate controlled by a single valve. The dam has a hydraulic height of 15 feet and a structural height of 20 feet, serving the surrounding area with water for irrigation needs.

Despite its age, Nicolaysen Dam continues to be inspected every five years to ensure its structural integrity and safety. As water resource and climate enthusiasts, it is crucial to monitor and manage the risk associated with dams like Nicolaysen to safeguard communities and maintain the sustainable use of water resources in the region.