Gill No. 5 Stock is a privately owned earth dam located in Sheridan, Wyoming, along the East Twin Creek. The dam serves multiple purposes including fire protection, stock water supply, and a small fish pond. With a height of 30 feet and a hydraulic height of 25 feet, the dam has a storage capacity of 194 acre-feet, with a normal storage level of 124 acre-feet.

Despite being classified as low hazard potential, the dam is regularly inspected by state regulatory agencies to ensure its structural integrity and safety. The last inspection in September 2018 found the dam to be in fair condition, with a moderate risk assessment rating of 3. With an uncontrolled spillway and a single valve outlet gate, the dam is equipped to manage potential overflow events.

Located in a picturesque setting with a surface area of 14 acres, Gill No. 5 Stock presents a unique opportunity for water resource and climate enthusiasts to study the intersection of human infrastructure and natural water systems. Its design and purpose offer insights into the management of water resources for agricultural, environmental, and emergency preparedness purposes in the region.