Water Supply No 3, located in Larimer, Colorado, is a privately owned irrigation dam completed in 1944 with a height of 41 feet and a length of 1694 feet. The dam has a storage capacity of 4300 acre-feet and serves the critical purpose of irrigation in the region. With a spillway width of 73 feet and a maximum discharge of 2154 cubic feet per second, the dam poses a high hazard potential but has been assessed to be in satisfactory condition as of June 2020. The dam is regulated by the Colorado Department of Water Resources and undergoes regular inspections to ensure public safety.

Situated on Dry Creek-TR, Water Supply No 3 plays a vital role in managing water resources in the area, with a normal storage capacity of 3350 acre-feet. The dam is under the jurisdiction of the state regulatory agency and meets all permitting, inspection, and enforcement requirements. Despite its moderate risk assessment, the dam has not undergone any major modifications in recent years, indicating a stable operational history. In case of emergencies, an Emergency Action Plan (EAP) is in place, although its last revision date was in December 2019.

Owned and operated by a private entity, Water Supply No 3 contributes significantly to the agricultural landscape of Fort Collins by providing essential water for irrigation purposes. The dam's structural integrity, with a hydraulic height matching its dam height of 41 feet, ensures efficient water management in the region. With its uncontrolled spillway and satisfactory condition, Water Supply No 3 stands as a crucial water resource infrastructure in Larimer County, Colorado, supporting the local economy and ecosystem through sustainable water supply management.