Dm No. 1 is a privately owned earth dam located in Washakie, Wyoming, along the DM Draw Offstream. Built in 1983 by designer Stanton J. Abell, Jr., this dam serves multiple purposes including fire protection, stock, and small fish pond management. With a structural height of 22 feet and a total length of 900 feet, Dm No. 1 has a storage capacity of 935 acre-feet, with a normal storage level of 29 acre-feet.

Although classified as having a low hazard potential, Dm No. 1 is regularly inspected by the State Regulatory Agency for compliance with safety and operational standards. The dam is equipped with two controlled outlet gates and a spillway width of 60 feet. The overall condition of the dam is assessed as fair, with a risk assessment rating of high (2) due to its critical role in water resource management for the surrounding area. Despite its age, Dm No. 1 continues to provide essential water management services for the community.

In summary, Dm No. 1 is a vital water infrastructure asset in Wyoming, serving as a reliable source for fire protection, stock watering, and recreational use. Despite its age, the dam remains in fair condition and is regularly monitored to ensure the safety of downstream areas and the surrounding environment. Its strategic location and design make Dm No. 1 a key component in managing water resources and climate-related challenges in the region.