Udall Reservoir Report
Last Updated: December 5, 2025
Udall is a privately owned dam located in Apache County, Arizona, along the Little Colorado River.
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Summary
Built in 1910, this earth dam stands at a height of 24 feet and stretches 423 feet in length, with a storage capacity of 5,000 acre-feet. Its primary purpose is for debris control and irrigation, serving the local community of Hunt. Despite its age, Udall has a low hazard potential and is currently classified as "Not Rated" in terms of its condition assessment.
Managed by the Arizona Department of Water Resources, Udall is subject to state regulation, permitting, inspection, and enforcement. The dam has a drainage area of 2,300 square miles and a maximum discharge capacity of 500 cubic feet per second. While the dam's spillway is uncontrolled with a width of 39 feet, its risk assessment is deemed moderate. The last inspection of Udall took place in June 2006, with an assigned inspection frequency of 5 years.
For water resource and climate enthusiasts, Udall presents an interesting case study of a historic dam that continues to play a vital role in local water management. With its low hazard potential and moderate risk assessment, Udall serves as a reminder of the importance of ongoing monitoring and maintenance of aging infrastructure to ensure the safety and sustainability of our water resources.
Year Completed |
1910 |
Dam Length |
423 |
Dam Height |
24 |
River Or Stream |
LITTLE COLORADO RIVER |
Primary Dam Type |
Earth |
Drainage Area |
2300 |
Nid Storage |
5000 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
24 |
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.
Udall