Clennon, located in Weld County, Colorado, is a privately-owned irrigation dam built in 1879 on the St. Vrain Creek-OS. Standing at a height of 14 feet, with a hydraulic height of 10 feet, and a length of 2000 feet, this earth dam serves the primary purpose of irrigation. With a storage capacity of 147 acre-feet, Clennon plays a significant role in managing water resources in the area.

Despite its age, Clennon is rated as being in satisfactory condition, with a significant hazard potential due to its uncontrolled spillway type. Regular inspections are conducted on this dam, with the last assessment done in November 2019. The risk assessment for Clennon is moderate, with a DSAC (Dam Safety Action Classification) of 3, indicating a need for ongoing risk management measures to ensure the safety and integrity of the structure.

Enthusiasts of water resources and climate will find Clennon to be a fascinating example of historical water infrastructure in Colorado. Its role in irrigation and water management, combined with its unique design features and risk assessment, make it a noteworthy site for those interested in the intersection of water resources and engineering.