Guineo Dam Reservoir Report
Nearby: Matrullas Dam Toa Vaca Dam
Last Updated: December 15, 2025
Guineo Dam, also known as Lago El Guineo, is a vital hydroelectric and irrigation structure located in Ciales, Puerto Rico.
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Summary
Completed in 1931, this rockfill dam stands at a height of 115 feet and has a hydraulic height of 106 feet, serving as a key component in harnessing the power of the Toro Negro River for energy generation and agricultural purposes. With a storage capacity of 2180 acre-feet and a maximum discharge of 7000 cubic feet per second, Guineo Dam plays a crucial role in water resource management and climate resilience efforts in the region.
Despite its historical significance and functional importance, Guineo Dam currently faces challenges in terms of its structural integrity and hazard potential. Classified as having a high hazard potential and assessed as being in poor condition, the dam requires immediate attention and maintenance to ensure its continued safe operation. With a risk assessment rating of moderate (3), the dam's risk management measures and emergency preparedness protocols need to be reviewed and updated to mitigate potential risks and safeguard the surrounding communities in case of emergencies.
As a prominent feature in the hydrological landscape of Puerto Rico, Guineo Dam serves as a reminder of the intricate balance between water resources, climate dynamics, and infrastructure resilience. With its rich history, functional versatility, and current maintenance needs, Guineo Dam stands as a symbol of the ongoing challenges and opportunities in managing water resources for sustainable development and climate adaptation in the region.
Year Completed |
1931 |
Dam Height |
115 |
River Or Stream |
TORO NEGRO RIVER |
Primary Dam Type |
Rockfill |
Surface Area |
77 |
Hydraulic Height |
106 |
Drainage Area |
1.57 |
Nid Storage |
2180 |
Structural Height |
115 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
115 |
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.
Guineo Dam