Big Creek #3, also known as Atkinson, is a privately owned irrigation dam located in Plateau City, Colorado. Completed in 1893, this earth dam stands at a height of 35 feet and has a storage capacity of 1,842 acre-feet, serving the purposes of irrigation, recreation, and water supply. The dam, situated on the East Fork Big Creek, has a spillway width of 12 feet and a maximum discharge of 300 cubic feet per second, with a hazard potential rated as high.

Despite its age, Big Creek #3 remains in fair condition as of the last inspection in July 2020, with moderate risk associated with its operation. The dam has undergone modifications in 1964 for hydraulic, mechanical, and structural improvements. With its proximity to Mesa, Colorado, this dam plays a crucial role in water resource management in the region, highlighting the importance of ongoing inspections, maintenance, and emergency preparedness to ensure its continued safe operation for the community and surrounding areas.