Pellejas Dam Reservoir Report
Nearby: Adjuntas Dam Vivi Dam
Last Updated: December 13, 2025
Pellejas Dam in Puerto Rico is a stunning example of a gravity dam primarily used for hydroelectric purposes.
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Summary
Built in 1950 on the Pellejas River in Utuado, this dam stands at a height of 50 feet and has a maximum storage capacity of 280 acre-feet. Its multi-arch core design on a rock foundation contributes to its structural integrity, while its uncontrolled spillway and high hazard potential highlight the importance of regular inspections and risk assessments.
With a drainage area of 8.5 square miles and a maximum discharge of 22,700 cubic feet per second, Pellejas Dam plays a crucial role in water resource management in the region. Despite its moderate risk assessment rating, the dam's satisfactory condition assessment as of January 2020 demonstrates its reliability in providing clean, renewable energy through hydroelectric power generation. As climate change continues to impact water resources, the resilience of dams like Pellejas will be essential in mitigating the effects of extreme weather events and ensuring a sustainable water supply for future generations.
Located in a picturesque setting in Adjuntas, Puerto Rico, Pellejas Dam serves as a testament to the intersection of engineering innovation and environmental stewardship. Managed by the Puerto Rico Electric Power Authority (PREPA), this dam represents a commitment to harnessing the power of water resources for the greater good while upholding rigorous state regulations and enforcement measures. As interest in renewable energy sources grows, Pellejas Dam stands as a shining example of how hydroelectric infrastructure can contribute to a cleaner, more sustainable future for water and climate enthusiasts alike.
Year Completed |
1950 |
Dam Height |
50 |
River Or Stream |
PELLEJAS RIVER |
Primary Dam Type |
Gravity |
Surface Area |
5 |
Hydraulic Height |
46 |
Drainage Area |
8.5 |
Nid Storage |
280 |
Structural Height |
50 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
50 |
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.
Pellejas Dam
Lago Yahuecas Nr Adjuntas