Ireland #1 is a privately owned irrigation dam located in Weld County, Colorado, along Boxelder Creek. Built in 1919, this Earth dam stands at 13 feet high and stretches 440 feet in length, with a storage capacity of 156 acre-feet. The dam serves the primary purpose of irrigation, with a normal storage capacity of 116 acre-feet and a maximum discharge rate of 882 cubic feet per second.

Despite its age, Ireland #1 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam operates with an uncontrolled spillway system, with a spillway width of 32 feet. While the risk assessment for this dam is considered moderate, with a DSAC assigned date unknown, there are currently no emergency action plans or inundation maps prepared for this structure. With state regulation and inspection in place, Ireland #1 continues to support agricultural activities in the region while maintaining a relatively low risk profile.