Located in Lyman State Park in Apache, Arizona, the H-V Reservoir is a privately owned structure regulated by the Arizona Department of Water Resources. Originally completed in 1883 for irrigation purposes, this earth dam stands at 15.4 feet high with a storage capacity of 260 acre-feet. With a surface area of 50.6 acres and a spillway width of 67 feet, the reservoir serves as a vital resource for managing water resources in the region.

The H-V Reservoir, situated along Coyote Creek, has a low hazard potential and is classified as having a moderate risk level. Despite not being rated for its condition, the reservoir undergoes inspections every five years to ensure its structural integrity. While no emergency action plan or inundation maps are currently in place, the reservoir plays a crucial role in supporting agricultural activities and sustaining water supply in the area. With its historical significance and ongoing regulatory oversight, the H-V Reservoir remains a valuable asset for water resource and climate enthusiasts interested in understanding the intersection of infrastructure and environmental stewardship.

As one of the oldest dams in Arizona, the H-V Reservoir serves as a testament to the state's long-standing commitment to water management. With its earth dam design and uncontrolled spillway, the reservoir stands as a key example of early irrigation infrastructure in the region. While its risk level is moderate, the reservoir's low hazard potential reflects the careful maintenance and regulatory oversight it receives. For those passionate about water conservation and climate resilience, the H-V Reservoir offers a fascinating case study in balancing agricultural needs with sustainable resource management practices.