Mullen is a private water resource located in Campbell, Wyoming, specifically on Dry Creek. Built in 1970, this earth dam stands at a height of 22 feet and serves multiple purposes including fire protection, stock, and a small fish pond. With a storage capacity of 68 acre-feet, it covers a surface area of 6 acres and has a spillway width of 50 feet.

Despite being regulated and inspected by the Wyoming State Engineer's Office, Mullen is classified as having a low hazard potential and poor condition assessment. Its last inspection in September 2016 revealed the need for improvements. With a moderate risk assessment level, there is a call for enhanced risk management measures to ensure the safety and functionality of this vital water structure.

The location of Mullen, near Liz Cheney's congressional district, highlights the importance of maintaining and upgrading water resources in the face of changing climate patterns. As enthusiasts in water resource and climate issues, it is crucial to advocate for the necessary investments and policies that will safeguard structures like Mullen and ensure a sustainable water future for Wyoming and beyond.