Soldier Annex Dam Reservoir Report

Last Updated: December 5, 2025

Soldier Annex Dam, located in Coconino, Arizona, is a federally owned structure managed by the USDA Forest Service.


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Summary

Built in 1935, this Earth-type dam stands at a height of 30 feet with a hydraulic height of 27 feet, serving primarily for irrigation purposes. The dam has a storage capacity of 1886 acre-feet and covers a surface area of 106 acres, with a drainage area of 3 square miles along the Jacks Canyon Tributary.

Despite its low hazard potential, Soldier Annex Dam plays a crucial role in providing water resources for irrigation, fire protection, stock watering, and wildlife habitat enhancement in the region. With a moderate risk assessment rating, the dam has been inspected periodically, the last being in August 2017, to ensure its structural integrity and safety. Although not currently rated for condition assessment, the dam continues to support the surrounding ecosystem and community through its water management capabilities.

Soldier Annex Dam's presence in the Two Guns area contributes significantly to water resource management in Arizona. As a key component in the local water infrastructure, the dam serves as a vital resource for both agricultural and ecological purposes. With its historical significance and ongoing maintenance efforts by the Forest Service, the dam stands as a testament to sustainable water resource management in the region, catering to the diverse needs of the community while preserving the natural environment.

Year Completed

1935

Dam Length

1660

Dam Height

30

River Or Stream

JACKS CANYON TRIBUTARY

Primary Dam Type

Earth

Surface Area

106

Hydraulic Height

27

Drainage Area

3

Nid Storage

1886

Structural Height

30

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

30
       
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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.