Summary
The dam, with an earth core design and buttress foundation, stands at a height of 30.5 feet and spans a length of 340 feet, creating a reservoir with a storage capacity of 2,284 acre-feet. Situated on the North Mountain Hope Wash, the dam serves as a critical water resource in the region, with low hazard potential and a moderate risk assessment rating.
Managed by the Arizona Department of Water Resources, Oro Ranch undergoes regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulations. Despite its condition not being rated, the dam's last inspection in 2007 deemed it to have low hazard potential. While the dam does not have an Emergency Action Plan (EAP) in place, it meets state jurisdiction and regulatory requirements, contributing to water resource management and climate resilience efforts in the area.
Overall, Oro Ranch (Lake Mary) plays a crucial role in providing water for fire protection and livestock while serving as a recreational spot for small fish. With its controlled spillway and moderate risk assessment, the dam stands as a key infrastructure managed by the state to ensure the safety and sustainability of water resources in the region. As water resource and climate enthusiasts, it is essential to monitor and support efforts to maintain and enhance the functionality of such critical structures for the benefit of the community and the environment.
Dam Length |
340 |
Dam Height |
30.5 |
River Or Stream |
NORTH MOUNTAIN HOPE WASH |
Primary Dam Type |
Earth |
Surface Area |
260 |
Drainage Area |
8.7 |
Nid Storage |
2284 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
31 |
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.
Oro Ranch (Lake Mary)