Carroll No. 1 is a privately-owned earth dam in the Big Muddy Oil Field of Natrona, Wyoming, designed for irrigation purposes on Elkhorn Creek. Completed in 1946, this structure stands at a height of 24 feet and stretches 626 feet in length, with a storage capacity of 112 acre-feet. Its spillway, classified as uncontrolled, has a width of 6 feet, making it well-equipped for managing water flow in the area. Despite its age, Carroll No. 1 is in fair condition and poses a low hazard potential, with a moderate risk assessment rating.

Located in Congressional District 00 of Wyoming, Carroll No. 1 is subject to state regulation and inspection, ensuring its compliance with safety standards. The dam features a single valve outlet gate for water release and has undergone its last inspection in April 2017, with a scheduled inspection frequency of 5 years. In case of any emergencies, the structure is deemed to have a moderate risk level, prompting the need for risk management measures to be in place. Overall, Carroll No. 1 serves as a vital resource for irrigation in the region while maintaining a relatively low risk profile.