Maricopa Road Basin Reservoir Report
Nearby: Green Road Basin Amarillo Valley Road
Last Updated: December 13, 2025
Maricopa Road Basin in Pinal, Arizona, serves as a vital flood risk reduction structure managed by local government authorities.
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Summary
Completed in 1995, this Earth dam stands at 7.7 feet high and spans 4,202 feet in length, offering a storage capacity of 123 acre-feet to safeguard the surrounding area from potential flooding events. Despite its critical purpose, the dam's condition assessment was deemed unsatisfactory during a 2018 evaluation, highlighting the need for maintenance and repairs to ensure continued effectiveness.
This high-hazard potential structure is regulated by the Arizona Department of Water Resources, with state permitting, inspection, and enforcement in place to uphold safety standards. While the Maricopa Road Basin primarily serves flood risk reduction, it also provides additional benefits for fire protection, livestock, and small fish pond purposes. The dam's spillway, with a width of 13 feet, helps manage excess water flow during peak periods, underscoring the importance of proper infrastructure and maintenance in water resource management and climate resilience efforts in the region.
As water resource and climate enthusiasts track the evolving landscape of infrastructure, the Maricopa Road Basin stands as a critical piece of the puzzle in safeguarding communities from flooding risks. With a moderate risk assessment rating, ongoing attention and investment in maintenance and risk management measures are essential to ensure the dam's continued effectiveness in protecting the area and mitigating potential hazards associated with extreme weather events.
Year Completed |
1995 |
Dam Length |
4202 |
Dam Height |
7.7 |
River Or Stream |
UNKNOWN |
Primary Dam Type |
Earth |
Surface Area |
24.5 |
Nid Storage |
123 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Maricopa Road Basin