Big Boy is a privately owned earth dam located in Johnson County, Wyoming, near the city of Arvada. Completed in 1969, the dam stands at a height of 33 feet and serves multiple purposes including fire protection, stock watering, and as a small fish pond. With a storage capacity of 55 acre-feet, the dam covers a surface area of 4 acres and has a drainage area of 2.4 square miles.

Despite its low hazard potential, the dam's condition assessment is rated as poor, indicating a need for maintenance and repairs. The last inspection in June 2021 highlighted this concern, with a moderate risk assessment score of 3. While the dam has an uncontrolled spillway with a width of 40 feet, it lacks outlet gates for controlled water release. The primary source agency for Big Boy is the Wyoming State Engineer's Office, which regulates, inspects, and enforces safety standards for the dam.

Water resource and climate enthusiasts will find Big Boy to be an intriguing structure due to its multiple uses and the challenges it faces in terms of maintenance and risk management. The dam's location along Caple Drive and Triple Crossing Drive provides important water resources for the surrounding area, emphasizing the importance of ensuring its safety and stability. As discussions around water management and climate adaptation continue, the condition of dams like Big Boy will be crucial in safeguarding water resources for future generations.