Kearny Lake Reservoir Report

Last Updated: December 27, 2025

Kearny Lake, located in Gila River, Pinal County, Arizona, is a man-made earth dam constructed in 2000 primarily for the purpose of creating a Fish and Wildlife Pond.


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Summary

Managed by the Arizona Department of Water Resources, this offstream reservoir has a capacity of 203 acre-feet, with a normal storage level of 150 acre-feet and a surface area of 10.2 acres. The dam stands at a height of 28 feet and spans 1700 feet in length, with a maximum discharge capacity of 1405 cubic feet per second.

Despite its high hazard potential, Kearny Lake is currently deemed to be in satisfactory condition, as per the latest inspection conducted in January 2021. The spillway, with a width of 25 feet, is uncontrolled in nature. The reservoir's drainage area is relatively small at 0.04 square miles, contributing to its moderate risk assessment rating. With its primary purpose being fish and wildlife conservation, Kearny Lake serves as a vital resource for habitat restoration and recreational activities in the area.

Year Completed

2000

Dam Length

1700

Dam Height

28

River Or Stream

OFFSTREAM

Primary Dam Type

Earth

Surface Area

10.2

Hydraulic Height

28

Drainage Area

0.04

Nid Storage

203

Hazard Potential

High

Foundations

Soil

Nid Height

28
       
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.