Number 10 Tank Reservoir Report

Last Updated: December 5, 2025

Number 10 Tank, nestled in the scenic Partridge Canyon Watershed in Coconino, Arizona, is a hidden gem for water resource and climate enthusiasts.


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Summary

Built in 1939, this Earth dam stands at 21 feet tall and stretches 500 feet in length, with a storage capacity of 167 acre-feet. Primarily used for Fish and Wildlife Pond purposes, it also serves for fire protection, stock, and small fish pond needs. The dam's low hazard potential and moderate risk assessment make it a safe and reliable structure in the region.

Managed by a private entity in conjunction with the Arizona Department of Water Resources, Number 10 Tank undergoes regular inspections and enforcement measures to ensure its structural integrity and compliance with state regulations. Located just 5.5 miles from Interstate 40, this peaceful reservoir covers an area of 8.7 acres and has a normal storage capacity of 96 acre-feet. With a maximum discharge rate of 7,164 cubic feet per second, the dam features an uncontrolled spillway with a width of 39 feet, providing effective flood control measures for the surrounding area.

Despite its age, Number 10 Tank continues to play a vital role in supporting the local ecosystem and water supply needs. Its stone core and unlisted/unknown foundation type contribute to its durability and resilience. As a well-maintained structure with a track record of meeting safety guidelines, this picturesque dam stands as a testament to the importance of sustainable water management practices in the face of changing climate patterns.

Year Completed

1939

Dam Length

500

Dam Height

21

River Or Stream

PARTRIDGE CANYON WATERSHED

Primary Dam Type

Earth

Surface Area

8.7

Drainage Area

7

Nid Storage

167

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

21
       
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.