Eastdale #1 is a privately owned irrigation dam located in Costilla, Colorado, along the Costilla Creek. Built in 1909, this earth dam stands at 31 feet high and spans 2175 feet in length, with a storage capacity of 5820 acre-feet. Despite its low hazard potential, the dam's condition has been assessed as unsatisfactory, with the last inspection in May 2017 revealing the need for improvements.

The dam features two slide (sluice) gates as outlet structures and an uncontrolled spillway with a width of 75 feet. With a maximum discharge capacity of 4384 cubic feet per second, Eastdale #1 serves the critical purpose of irrigation for the surrounding area. However, with a moderate risk assessment rating and a history of unsatisfactory condition, there may be challenges ahead in ensuring the dam's safety and functionality in the face of changing climate conditions and water resource management practices.

As water resource and climate enthusiasts, keeping a watchful eye on Eastdale #1's maintenance and potential upgrades will be crucial in safeguarding its role in supporting agricultural activities and water supply in the region. With a clear understanding of the dam's history, purpose, and current condition, stakeholders can work together to address any risks and ensure the resilience of this essential infrastructure for the future.