Lake Guayabal Water Level
Lago Guayabal · Juana Díaz, Puerto Rico · operated by Puerto Rico Electric Power Authority (PREPA/AEE)
Water level
102.29 m
above mean sea level · 2026-08-08
ObservationAt 102.29 m, Lake Guayabal is well below its seasonal norm — lower than 89.9% of all August days recorded since 1995.
Recorded range
99.39 – 104.3 m
Position in range
59.1%
Seasonal percentile
10.1%
Record since
1995
Official operating levels (PREPA)
Overflow
103.94 m
Safety
102.72 m
Observation
101.80 m
Adjustments
99.97 m
Control
98.45 m
Out of service
97.23 m
These are the thresholds the Puerto Rico Electric Power Authority publishes for this reservoir. They, not a storage percentage, are what trigger operational adjustments and rationing decisions on the island.
The chart plots where the water level sits inside the range this reservoir has recorded since 1995 (99.39 m to 104.3 m). It is a level position, not a share of storage capacity — Puerto Rico does not publish reservoir volume.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Dam and gauge
Design capacity
4.07 hm³
National Inventory of Dams
USGS gauge
50111300
Daily values, 15-minute source data
Municipality
Juana Díaz
South Puerto Rico
Primary use
hydropower
PREPA / AEE
Design capacity is the volume the dam was built to impound, from the US Army Corps of Engineers' National Inventory of Dams. It describes the size of the reservoir — it is not used to compute a fill percentage, because the elevation-to-volume curve needed for that is not published for Puerto Rico.