Lago Yahuecas Nr Adjuntas Reservoir Report

Last Updated: December 13, 2025

Lago Yahuecas is a natural lake located in the mountainous region of Adjuntas, Puerto Rico.


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Summary

The lake is surrounded by lush vegetation and features crystal-clear waters. Lago Yahuecas has a rich history, as it was used by the Taíno Indians to purify their bodies and spirits. The hydrology of the lake is mainly fed by surface flow and snowpack from the surrounding mountains. The lake is a vital source of water for agricultural purposes, and its waters are also used for recreational activities such as swimming and boating. The surrounding area is known for its coffee plantations, which use the lake's water for irrigation. Lago Yahuecas is an essential natural resource in Puerto Rico and its preservation is vital for the local ecosystem and economy.

Reservoir Details

Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0.0%
Percent of Normal 100%
Minimum 1,462.87 ft
2014-09-03
Maximum 1,472.85 ft
2014-11-04
Average 1,468 ft
Dam_Height 90
Hydraulic_Height 86
Drainage_Area 17.4
Year_Completed 1956
Nid_Storage 2400
Hazard_Potential High
Structural_Height 90
River_Or_Stream RIO BLANCO
Foundations Rock
Surface_Area 55
Outlet_Gates None
Primary_Dam_Type Gravity
Nid_Height 90
       
Seasonal Comparison
Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft Levels
Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, M Levels

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.