Simpson Dam, located in Comanche, Texas, is a privately owned irrigation dam constructed in 1986 by the USDA NRCS. Situated on the Horse Branch Sabana River, this earth dam stands at 15 feet in height and has a storage capacity of 80 acre-feet. With a primary purpose of irrigation, it serves a drainage area of 1.47 square miles and covers a surface area of 6 acres.

Despite lacking a spillway, Simpson Dam is deemed to have a high risk potential and is not rated for its condition assessment. With no inspection frequency or emergency action plan in place, the dam's hazard potential remains unknown. Although it has not been modified over the years, it holds essential importance in managing water resources for agricultural purposes in the region. For water resource and climate enthusiasts, Simpson Dam presents an intriguing case study of a privately owned irrigation structure with significant implications for its surrounding environment.