Green Valley Park Reservoir Report

Last Updated: December 28, 2025

Green Valley Park, located in Payson, Arizona, is a local government-owned recreational area with a primary purpose of providing leisure opportunities for the community.


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Summary

The park features an Earth-type dam on the American Gulch river, completed in 1995, with a height of 13 feet and a length of 1005 feet, creating a reservoir with a storage capacity of 180 acre-feet. The park offers activities such as fishing, picnicking, and hiking in a scenic setting surrounded by nature.

Managed by the Arizona Department of Water Resources, Green Valley Park is subject to state regulations, inspections, and enforcement to ensure its safety and functionality. With a high hazard potential but a satisfactory condition assessment, the dam is regularly inspected, with the last assessment conducted in March 2018. The park's spillway, which is uncontrolled and 450 feet wide, serves to manage maximum discharge rates of up to 9000 cubic feet per second, protecting downstream areas from flooding risks.

Despite its moderate risk assessment, Green Valley Park remains a popular destination for water resource and climate enthusiasts seeking a peaceful getaway in Gila County, Arizona. With its well-maintained facilities, beautiful surroundings, and recreational opportunities, the park continues to attract visitors looking to enjoy the outdoors while appreciating the importance of responsible water management in a changing climate.

Year Completed

1995

Dam Length

1005

Dam Height

9

River Or Stream

AMERICAN GULCH

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

9

Drainage Area

3.1

Nid Storage

180

Structural Height

13

Hazard Potential

High

Foundations

Soil

Nid Height

13
       
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.