Thomas No. 1 is a privately-owned earth dam located in Hulett, Wyoming, along Buffalo Creek. Completed in 1914 for the primary purpose of irrigation, this structure stands at a height of 22 feet with a hydraulic height of 17 feet. Despite its low hazard potential, the dam is currently in poor condition, last assessed in 2017.

With a storage capacity of 168 acre-feet, Thomas No. 1 covers a surface area of 18 acres and has a spillway width of 80 feet. The dam is regulated by the Wyoming State Engineer's Office, with state inspection, permitting, and enforcement in place. While the dam has not undergone any significant modifications in recent years, its risk assessment is rated as moderate (3), indicating a need for continued monitoring and management measures to ensure the safety of downstream communities and the surrounding environment.

As water resource and climate enthusiasts, understanding the role of structures like Thomas No. 1 in managing water resources is crucial. By staying informed about the condition and regulation of dams such as this one, enthusiasts can contribute to efforts aimed at safeguarding water supplies, mitigating flood risks, and promoting sustainable water management practices in the face of changing climatic conditions.