Sunnyside Reservoir Report

Last Updated: December 5, 2025

Sunnyside, also known as Sheep Springs #2, is a state-regulated dam located in Apache County, Arizona, along Fish Creek.


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Summary

Built in 1912, this earth dam stands at a height of 13.2 feet and has a storage capacity of 72.2 acre-feet, primarily serving purposes such as fire protection, stock watering, and as a small fish pond. With a spillway width of 35 feet and a low hazard potential, Sunnyside plays a crucial role in water resource management in the region.

Managed by the Arizona Department of Water Resources, Sunnyside is subject to regular state inspections and enforcement, ensuring its structural integrity and safety. The dam's moderate risk assessment indicates the need for ongoing risk management measures to mitigate potential hazards. Despite its age, Sunnyside continues to provide essential water storage and management functions, demonstrating its importance in maintaining the local ecosystem and supporting various water-related activities in the area.

As a key structure in the region, Sunnyside stands as a testament to the early efforts in water infrastructure development and the ongoing commitment to safeguarding water resources for both human and environmental needs. With its historical significance and continued operational relevance, Sunnyside serves as a reminder of the vital role that dams play in water supply, climate adaptation, and overall community resilience in Arizona and beyond.

Year Completed

1912

Dam Length

266

Dam Height

13.2

River Or Stream

FISH CREEK

Primary Dam Type

Earth

Surface Area

16.4

Hydraulic Height

13.2

Drainage Area

6

Nid Storage

72.2

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

13
       
Seasonal Comparison

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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.