Chapman, also known as Hughes Chapman, is a privately owned irrigation dam located in Oak Creek, Colorado. Built in 1940, this earth dam stands at a height of 34 feet and spans 250 feet in length, providing crucial water storage for irrigation purposes. Situated on the Little Oak Creek, Chapman has a normal storage capacity of 246 acre-feet and a maximum storage capacity of 471 acre-feet.

Managed by the Colorado Department of Water Resources, Chapman is regulated and inspected regularly to ensure its structural integrity and operational efficiency. The dam has a significant hazard potential but has been assessed to be in satisfactory condition as of October 2019. In the event of an emergency, the dam's emergency action plan is up to date, meeting established guidelines. Despite its moderate risk rating, Chapman plays a vital role in water resource management in the region, highlighting the importance of maintaining and monitoring such essential infrastructure for climate and water resource enthusiasts.