Apache Junction Frs Reservoir Report

Last Updated: December 5, 2025

Apache Junction Flood Retarding Structure (FRS) is a vital component of flood risk reduction efforts in Apache Junction, Arizona.


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Summary

Built in 1988, this earth dam stands at a height of 38 feet and stretches over 8,450 feet, with a storage capacity of 2,050 acre-feet. Located on unnamed washes in Pinal County, this structure is regulated, permitted, inspected, and enforced by the Arizona Department of Water Resources, ensuring its reliability in protecting the surrounding area from floods.

Managed by the local government, Apache Junction FRS is designed by EBASCO and constructed with stone core and soil foundation. With a high hazard potential and moderate risk assessment, the dam features an uncontrolled spillway with a width of 100 feet and a maximum discharge of 1,875 cubic feet per second. Despite its satisfactory condition assessment as of December 2017, the structure undergoes regular inspections to maintain its effectiveness in flood risk reduction.

Overall, Apache Junction FRS plays a crucial role in safeguarding the community from potential flood events. With its strategic location and design features, including uncontrolled spillways and a robust emergency action plan, this structure demonstrates the commitment to water resource management and climate resilience in the region. As a key infrastructure asset, Apache Junction FRS stands as a testament to proactive flood risk reduction efforts in Pinal County, Arizona.

Year Completed

1988

Dam Length

8450

Dam Height

22

River Or Stream

UNNAMED WASHES

Primary Dam Type

Earth

Surface Area

174

Hydraulic Height

22

Drainage Area

6.15

Nid Storage

2050

Structural Height

38

Outlet Gates

Uncontrolled

Hazard Potential

High

Foundations

Soil

Nid Height

38
       
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.