Dull Knife, also known as Enl of 6800r, is a privately owned earth dam located in Johnson, Wyoming, along the North Fork Powder River. Completed in 1966, this irrigation dam stands at 80 feet in height, with a hydraulic height of 74 feet and a length of 570 feet. It has a storage capacity of 5003 acre-feet, serving the purpose of irrigation for the surrounding area.

Despite being privately owned, Dull Knife is regulated by the State of Wyoming, with inspections and enforcement measures in place to ensure its safety and functionality. The dam has a high hazard potential and a fair condition assessment, with a moderate risk rating. The last inspection was conducted in June 2017, with a recommended inspection frequency of 5 years to monitor any changes in its condition.

With its critical role in providing irrigation water to the region, Dull Knife serves as a vital water resource infrastructure in Wyoming. Climate and water resource enthusiasts can appreciate the engineering feat behind this dam, as well as the ongoing efforts to maintain its safety and functionality for the benefit of the local community and agriculture sector.