Mesa Reservoir Reservoir Report

Last Updated: December 5, 2025

Mesa Reservoir, located in Yavapai, Arizona, is a privately owned water supply structure regulated by the Arizona Department of Water Resources.


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Summary

Built in 1935, this Earth dam stands at 35 feet in height and spans 1800 feet in length, with a storage capacity of 154 acre-feet. The reservoir primarily serves as a water supply source for the surrounding area, with a normal storage level of 111 acre-feet.

Despite its low hazard potential, Mesa Reservoir is classified as having a high risk level (2), indicating the need for thorough risk management measures. The reservoir has not been rated for its condition assessment, but receives regular inspections every five years to ensure its structural integrity. The dam does not have a spillway and is not equipped with outlet gates or locks, making it a straightforward water storage structure.

Water resource and climate enthusiasts interested in Mesa Reservoir will find it to be a historic and essential component of the region's water infrastructure. With its location on Lynx Creek and its crucial role in supplying water to the city of DEWEY, Mesa Reservoir stands as a testament to the importance of responsible water management in the face of changing climate conditions.

Year Completed

1935

Dam Length

1800

Dam Height

35

River Or Stream

LYNX CREEK - OS

Primary Dam Type

Earth

Surface Area

10

Drainage Area

0.02

Nid Storage

154

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
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.