Jensen, also known as Cold Sore, is a privately owned irrigation dam located in Mesa, Colorado. Completed in 1913, this Earth type dam stands at 7 feet high and spans 126 feet in length, with a storage capacity of 110 acre-feet. Situated on Cottonwood Creek-OS, Jensen serves the crucial purpose of irrigation, supporting agricultural activities in the region.

Despite its age, Jensen has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The last inspection of the dam was conducted in August 1993, with a moderate risk assessment score of 3. While it is state-regulated and undergoes regular inspections, its emergency action plan status, inundation maps, and risk management measures are currently undocumented, suggesting areas for potential improvement in terms of safety and preparedness.

Water resource and climate enthusiasts will be intrigued by Jensen's historical significance as an irrigation structure in Colorado. Its location in Molina, along with its design and operational details, provide valuable insight into the importance of dams for water management and agriculture in the region. As efforts continue to assess and manage risks associated with aging infrastructure like Jensen, there is a clear need for ongoing maintenance and monitoring to ensure the safety and reliability of this vital water resource.