San Juan South Pond 4 Reservoir Report
Last Updated: December 19, 2025
Located in Waterflow, New Mexico, San Juan South Pond 4 is a public utility managed by the Office of the State Engineer.
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Summary
This Earth dam, completed in 1982, stands at a height of 30 feet and has a hydraulic height of 17.5 feet, providing a storage capacity of 258 acre-feet. With a surface area of 14.77 acres, the dam serves various purposes beyond just water storage, making it a significant resource in the region.
Despite its importance, the dam at San Juan South Pond 4 is currently classified as in poor condition with a significant hazard potential. The last inspection in May 2019 revealed the need for improvements and heightened risk management measures due to its high risk assessment rating. The dam's emergency action plan is not up to date, pointing to potential vulnerabilities in the event of a crisis. It is clear that proactive steps need to be taken to ensure the safety and functionality of this critical water resource.
As water resource and climate enthusiasts, it is imperative to monitor and address the condition of infrastructure like San Juan South Pond 4 to mitigate risks and protect the surrounding community and environment. With its unique design and multiple uses, this Earth dam plays a crucial role in water management in the region, underscoring the importance of ongoing maintenance and risk assessment to safeguard against potential disasters.
Year Completed |
1982 |
Dam Length |
3624 |
Dam Height |
30 |
River Or Stream |
SAN JUAN RIVER - OS |
Primary Dam Type |
Earth |
Surface Area |
14.77 |
Hydraulic Height |
17.5 |
Nid Storage |
258 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
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.
San Juan South Pond 4