Reach 11 Detention Dike 3 Reservoir Report

Last Updated: December 5, 2025

Reach 11 Detention Dike 3, located in Maricopa, Arizona, is a federal water resource structure managed by the Bureau of Reclamation.


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Summary

Completed in 1977, this earth dam stands at a height of 35 feet and serves primarily for flood risk reduction. With a storage capacity of 14,600 acre-feet, it plays a crucial role in protecting the surrounding area from potential inundation during heavy rainfall events.

Despite being a vital piece of infrastructure, Reach 11 Detention Dike 3 is designated as having a high hazard potential due to its location and purpose. This structure, along with two associated structures, safeguards the city of Phoenix from the impacts of flooding, providing essential water management and protection services. However, with no spillway and limited inspection data available, there may be a need for further assessment and maintenance to ensure its continued effectiveness in mitigating flood risks.

As climate change continues to impact water resources and weather patterns, structures like Reach 11 Detention Dike 3 play a crucial role in enhancing resilience and adaptation strategies. With its strategic location and significant storage capacity, this earth dam contributes to flood risk reduction, irrigation, recreation, and water supply in the region. As such, ongoing monitoring and maintenance efforts are essential to ensure the safety and functionality of this critical water resource infrastructure.

Year Completed

1977

Dam Length

10500

Dam Height

35

River Or Stream

NONE

Primary Dam Type

Earth

Hydraulic Height

29

Drainage Area

24

Nid Storage

14600

Structural Height

35

Hazard Potential

High

Foundations

Rock

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.