Pecos Arroyo Watershed Site 1 Reservoir Report
Nearby: Storrie Dam Bradner Dam
Last Updated: December 23, 2025
Located in San Miguel, New Mexico, Pecos Arroyo Watershed Site 1, also known as the San Guijjuela Arroyo Dam, is a key structure for flood risk reduction in the area.
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Summary
Built in 1965 by the USDA NRCS, this earth dam stands at a height of 47 feet and has a length of 1460 feet. With a storage capacity of 1723.7 acre-feet and a drainage area of 18.4 square miles, this dam plays a crucial role in managing water flow and mitigating flood risks in the region.
Despite its importance, Pecos Arroyo Watershed Site 1 is currently rated as having a high hazard potential and poor condition as of the last inspection in June 2019. The dam's spillway type is uncontrolled, with a width of 600 feet, and its outlet gates are also uncontrolled. The dam's risk assessment is moderate, indicating the need for ongoing monitoring and potential risk management measures. With its location in a flood-prone area and the potential for high discharge levels, the maintenance and upkeep of this structure are crucial for ensuring the safety of surrounding communities and the preservation of water resources in the region.
Owned by the local government and regulated by the Office of the State Engineer, Pecos Arroyo Watershed Site 1 is a significant asset in the overall water resource management strategy for the area. With its historical significance and vital role in flood risk reduction, this dam serves as a reminder of the importance of sustainable water resource practices and climate resilience in the face of changing environmental conditions.
Year Completed |
1965 |
Dam Length |
1460 |
Dam Height |
47 |
River Or Stream |
SAN GUIJUELA ARROYO |
Primary Dam Type |
Earth |
Surface Area |
166 |
Hydraulic Height |
47 |
Drainage Area |
18.4 |
Nid Storage |
1723.7 |
Structural Height |
49 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
49 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Storrie Lake State Park
|
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El Porvenir
|
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El Porvenir Campground
|
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EV Long
|
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E.V. Long Campground
|
Pecos Arroyo Watershed Site 1