Sibley Green Site 5 Reservoir Report
Last Updated: December 11, 2025
Sibley Green Site 5, located in Sierra, New Mexico, is a crucial part of the Sibley, Green, Jaralosa & Candler Arroyo Watershed, specifically serving the purpose of flood risk reduction.
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Summary
This earth dam, completed in 1977 by the USDA NRCS, stands at a height of 27 feet and has a storage capacity of 895 acre-feet. The dam spans a length of 4400 feet and covers a surface area of 88 acres, with a drainage area of 5.9 square miles, making it a significant structure in the region.
Despite its importance in managing flood risks, Sibley Green Site 5 is currently assessed to be in poor condition, with a high hazard potential. The last inspection in February 2018 highlighted the need for improvements and maintenance to ensure its effectiveness in mitigating flooding. The dam is classified as having a moderate risk level, emphasizing the need for risk management measures to be put in place to address any potential vulnerabilities and safeguard the surrounding communities and environment. Water resource and climate enthusiasts will find Sibley Green Site 5 to be a compelling case study in the intersection of infrastructure, environmental protection, and community resilience.
Year Completed |
1977 |
Dam Length |
4400 |
Dam Height |
27 |
River Or Stream |
JARALOSA ARROYO |
Primary Dam Type |
Earth |
Surface Area |
88 |
Hydraulic Height |
25 |
Drainage Area |
5.9 |
Nid Storage |
895 |
Structural Height |
39 |
Outlet Gates |
Uncontrolled - 0 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
39 |
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.
Sibley Green Site 5
Caballo Reservoir