Cholla Bottom Ash Pond Reservoir Report
Last Updated: December 5, 2025
Cholla Bottom Ash Pond, located in Joseph City, Arizona, is a vital water resource managed by a public utility.
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Summary
This earth dam structure, completed in 1978, stands at a height of 73 feet and has a storage capacity of 2,190 acre-feet. Situated along the Little Colorado River, the dam serves a primary purpose of 'Other' and is regulated by the Arizona Department of Water Resources.
With a high hazard potential and satisfactory condition assessment, Cholla Bottom Ash Pond undergoes regular inspections to ensure its safety and functionality. The dam's risk assessment is rated as high, indicating the importance of effective risk management measures. Despite the absence of a spillway, the structure's emergency action plan and inundation maps play a critical role in preparedness for potential incidents. Congressman Tom O'Halleran represents the area in which the dam is located, highlighting the importance of continued oversight and maintenance of this essential water infrastructure.
Year Completed |
1978 |
Dam Length |
4200 |
Dam Height |
73 |
River Or Stream |
LITTLE COLORADO RIVER - TR |
Primary Dam Type |
Earth |
Hydraulic Height |
73 |
Drainage Area |
0.2 |
Nid Storage |
2190 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
73 |
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.
Cholla Bottom Ash Pond