Luna Reservoir Report

Last Updated: December 5, 2025

Luna is a private irrigation structure located on the San Francisco River in Apache, Arizona.


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Summary

Built in 1911 by the USDA NRCS, Luna serves the primary purpose of irrigation and also supports recreation. This Earth type dam stands at 27 feet high, with a length of 292 feet and a storage capacity of 1800 acre-feet. The dam has a spillway width of 120 feet and is regulated by the Arizona Department of Water Resources.

Despite its age, Luna Dam remains in satisfactory condition with a significant hazard potential. Regular inspections are conducted, with the last assessment taking place in June 2019. The dam meets regulatory guidelines and has an emergency action plan in place to manage any potential risks. With a moderate risk assessment score of 3, Luna Dam is a crucial water resource structure in the region, ensuring water availability for irrigation and enhancing recreational opportunities for the community.

Year Completed

1911

Dam Length

292

Dam Height

27

River Or Stream

SAN FRANCISCO RIVER

Primary Dam Type

Earth

Surface Area

163

Drainage Area

36

Nid Storage

1800

Outlet Gates

Uncontrolled

Hazard Potential

Significant

Foundations

Rock

Nid Height

27
       
Seasonal Comparison

Weather Forecast

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.