Dos Bocas Dam Reservoir Report
Last Updated: December 13, 2025
Dos Bocas Dam, also known as Lago Dos Bocas, is a gravity dam located on the Arecibo River in Puerto Rico.
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Summary
Completed in 1942, this hydroelectric structure stands at a height of 188 feet, with a hydraulic height of 148.08 feet. The dam has a storage capacity of 50,000 acre-feet, with a normal storage of 30,420 acre-feet and a surface area of 634 acres.
Managed by the Puerto Rico Electric Power Authority (PREPA), Dos Bocas Dam is used for hydroelectric power generation and is regulated by the state. The dam has a spillway width of 346 feet and a maximum discharge capacity of 200,000 cubic feet per second. Despite being categorized as having a high hazard potential, the dam is currently in satisfactory condition according to a 2020 inspection.
Dos Bocas Dam plays a crucial role in harnessing the water resources of the Arecibo River for power generation, while also providing flood control and water storage capabilities. With its picturesque location and important functions, Dos Bocas Dam serves as a vital infrastructure for water resource and climate enthusiasts to explore and appreciate in the beautiful region of Arecibo, Puerto Rico.
Year Completed |
1942 |
Dam Height |
188 |
River Or Stream |
ARECIBO RIVER |
Primary Dam Type |
Gravity |
Surface Area |
634 |
Hydraulic Height |
148.08 |
Drainage Area |
170 |
Nid Storage |
50000 |
Structural Height |
188 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
188 |
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.
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