Hayden, located in Boulder, Colorado, is a privately owned dam with a primary purpose of irrigation. Built in 1905, this Earth dam stands at 27 feet tall and has a length of 1820 feet, holding a maximum storage capacity of 765 acre-feet. The dam overlooks Boulder Creek-OS and serves as a crucial water resource for the region, with a normal storage capacity of 502 acre-feet.

Despite its age, Hayden has undergone modifications in 1931 and 1974 to enhance its foundation, hydraulic, mechanical, and structural components. The dam features an uncontrolled spillway with a width of 220 feet and is equipped with one slide (sluice gate) outlet gate. Inspected most recently in October 2020, Hayden has been deemed to have a high hazard potential but is in satisfactory condition, meeting regulatory standards set by the Colorado Division of Water Resources.

Hayden's risk assessment indicates a moderate risk level (3) and the dam's Emergency Action Plan (EAP) was last revised in 2015. With a captivating history and significant role in irrigation and recreation activities, Hayden stands as a key infrastructure in the water resource management of Boulder, Colorado, under the jurisdiction of the Department of Water Resources.