Donnelly #1 is a privately owned earth dam located in Cedaredge, Colorado, along Kiser Creek. Built in 1955 for irrigation purposes, the dam stands at a height of 20 feet and has a storage capacity of 428 acre-feet. With a spillway width of 15 feet and a maximum discharge of 588 cubic feet per second, the dam poses a significant hazard potential and is classified as having a fair condition assessment as of August 2019.

Despite its age, Donnelly #1 is still regularly inspected and meets state regulatory standards for permitting, inspection, and enforcement. The dam's risk assessment is categorized as moderate, indicating a level 3 risk. The emergency action plan for the dam was last revised in March 2020, ensuring that appropriate measures are in place in case of a potential failure. Overall, Donnelly #1 serves as a vital piece of infrastructure for irrigation in the region, highlighting the importance of proper maintenance and monitoring for water resource and climate enthusiasts.