Jumbo Reservoir Report
Nearby: Mexican Tank Steel Dam
Last Updated: December 5, 2025
Jumbo, a private-owned dam located in Yavapai, Arizona, serves as a crucial resource for fish and wildlife pond purposes.
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Summary
Built in 1945, this earth dam stands at 32 feet high and spans 320 feet in length, with a storage capacity of 200 acre-feet. It is regulated by the Arizona Department of Water Resources and undergoes regular inspections, with a low hazard potential and moderate risk assessment rating.
Situated along the Ash Fork Draw river, Jumbo provides essential fire protection and stock watering capabilities in addition to its primary function as a fish and wildlife habitat. With a surface area of 17 acres and a normal storage capacity of 114 acre-feet, this dam plays a vital role in supporting the local ecosystem. Despite its age, Jumbo remains a reliable structure with no reported condition assessment and a history of meeting regulatory guidelines.
As a significant feature in the water resource and climate landscape of Arizona, Jumbo is a testament to the importance of maintaining and managing dams for both environmental and community benefits. Its operation and oversight by the Arizona Department of Water Resources ensure the continued safety and functionality of this essential infrastructure for years to come.
Year Completed |
1945 |
Dam Length |
320 |
Dam Height |
32 |
River Or Stream |
ASH FORK DRAW |
Primary Dam Type |
Earth |
Surface Area |
17 |
Drainage Area |
88 |
Nid Storage |
200 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
32 |
Seasonal Comparison
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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.
Jumbo