H-V Reservoir Reservoir Report
Nearby: Scarlett Lake Nelson
Last Updated: December 5, 2025
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.
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Summary
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.
Year Completed |
1883 |
Dam Length |
771 |
Dam Height |
15.4 |
River Or Stream |
COYOTE CREEK - TR |
Primary Dam Type |
Earth |
Surface Area |
50.6 |
Hydraulic Height |
15.4 |
Nid Storage |
260 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
H-V Reservoir