Lone Pine Reservoir Report

Last Updated: December 5, 2025

Lone Pine is a key flood risk reduction structure located in Schoens Dam, Navajo, Arizona.


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Summary

Built in 1936, this earth dam stands at a height of 98 feet and spans 900 feet in length, with a storage capacity of 14,700 acre-feet along Show Low Creek. Despite its low hazard potential, Lone Pine plays a crucial role in safeguarding the surrounding area from potential flooding events, with a maximum discharge capacity of 15,000 cubic feet per second.

Managed by the Arizona Department of Water Resources, Lone Pine undergoes regular inspections to ensure its structural integrity and functionality. The dam's satisfactory condition assessment in 2015 highlights its reliability in flood risk mitigation. With a moderate risk assessment rating, this structure is equipped with uncontrolled spillways and a spillway width of 360 feet to manage excess water flow effectively. In the event of an emergency, the dam's risk management measures are in place to mitigate potential hazards and ensure public safety.

Water resource and climate enthusiasts can appreciate the role of Lone Pine in protecting the community from flooding and maintaining water storage capacity in the region. As a vital piece of infrastructure in Arizona's water management system, this earth dam exemplifies the importance of proactive risk assessment and maintenance to ensure the continued safety and efficiency of water resource structures.

Year Completed

1936

Dam Length

900

Dam Height

98

River Or Stream

SHOW LOW CREEK

Primary Dam Type

Earth

Surface Area

357

Hydraulic Height

98

Drainage Area

183

Nid Storage

14700

Hazard Potential

Low

Foundations

Rock

Nid Height

98
       
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.