A-27 is a privately owned Earth dam located in Merino, Colorado, along the Twenty Two Slough river. Completed in 1949, this dam serves primarily for irrigation purposes, with a storage capacity of 557 acre-feet. It stands at a height of 14 feet and spans 1300 feet in length, providing water for agricultural needs in the region.

Despite being classified as having a low hazard potential, A-27 is considered to have a high risk due to its condition assessment being marked as "Not Rated." The last inspection of the dam took place in July 1980, with an inspection frequency of 6 years. While the dam has no spillway, it has a spillway width of 700 feet, indicating some level of safety measures in place for potential overflow events.

For water resource and climate enthusiasts, A-27 presents an interesting case study in the management of irrigation infrastructure in rural Colorado. With its historical significance and ongoing risk assessment, the dam serves as a focal point for understanding the complexities of maintaining aging water infrastructure in the face of changing climate conditions.