Sebastian Martin Site 2 Dam Reservoir Report

Last Updated: December 9, 2025

Located in Rio Arriba, New Mexico, the Sebastian Martin Site 2 Dam is also known as the Arroyo Del Guique Retard Dam.


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Summary

Built in 1977 by the USDA NRCS, this earth-type dam stands at a structural height of 60 feet and serves the primary purpose of flood risk reduction along the ARROYO DEL GUIQUE stream. With a capacity to store 103 acre-feet of water, the dam has a spillway width of 50 feet and a maximum discharge of 636 cubic feet per second.

The dam, under the jurisdiction of the Office of the State Engineer in New Mexico, is subject to regular state inspections and enforcement. Despite being classified as having a high hazard potential, the condition assessment in 2017 rated it as fair. The Emergency Action Plan (EAP) for the dam is in the process of being updated to meet guidelines, ensuring that in case of any emergency, appropriate measures can be taken to mitigate risks and protect surrounding areas.

Overall, the Sebastian Martin Site 2 Dam plays a crucial role in managing flood risks in the region, with a moderate risk assessment rating. In collaboration with local government agencies, the dam continues to be monitored and maintained to ensure its effectiveness in safeguarding the community and the environment.

Year Completed

1977

Dam Length

740

Dam Height

33

River Or Stream

ARROYO DEL GUIQUE

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

33

Nid Storage

103

Structural Height

60

Outlet Gates

Uncontrolled - 0

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

60
       
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.