Lake Guayo Water Level
Lago Guayo · Lares, Puerto Rico · operated by Puerto Rico Electric Power Authority (PREPA/AEE)
Water level
442.88 m
above mean sea level · 2026-08-08
SafetyAt 442.88 m, Lake Guayo is close to its seasonal norm for August, sitting above 54.9% of August days recorded since 1990.
Recorded range
431.47 – 448.33 m
Position in range
67.7%
Seasonal percentile
54.9%
Record since
1990
Official operating levels (PREPA)
Overflow
445.01 m
Safety
441.96 m
Observation
440.13 m
Adjustments
438.30 m
Control
436.78 m
Out of service
435.56 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 1990 (431.47 m to 448.33 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
21.46 hm³
National Inventory of Dams
USGS gauge
50141500
Daily values, 15-minute source data
Municipality
Lares
West 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.