Haralson Reservoir Report

Last Updated: December 5, 2025

Haralson is a vital earth dam located in Thatcher, Arizona, along the Gila River - TR.


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Summary

Built in 1919, this structure serves as a crucial water supply resource for the region, with a storage capacity of 89 acre-feet and a normal storage level of 68 acre-feet. The dam stands at a height of 29 feet, with a hydraulic height of 44 feet, and stretches for 375 feet in length, covering a surface area of 7 acres.

Managed by the Arizona Department of Water Resources, Haralson is regulated, permitted, inspected, and enforced by the state agency, ensuring its structural integrity and compliance with safety standards. With a high hazard potential but a satisfactory condition assessment as of April 2018, the dam presents a moderate risk (3) according to the risk assessment. Despite its age, Haralson continues to play a crucial role in water resource management for Graham County, Arizona, making it an essential piece of infrastructure for both local government and water enthusiasts.

Year Completed

1919

Dam Length

375

Dam Height

29

River Or Stream

GILA RIVER - TR

Primary Dam Type

Earth

Surface Area

7

Drainage Area

0.01

Nid Storage

89

Structural Height

44

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

44
       
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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.