Lake Patillas Water Level
Lago Patillas · Patillas, Puerto Rico · operated by Puerto Rico Electric Power Authority (PREPA/AEE)
Water level
65.75 m
above mean sea level · 2026-11-08
SafetyAt 65.75 m, Lake Patillas is close to its seasonal norm for November, sitting above 30.7% of November days recorded since 1995.
Recorded range
61.59 – 68.21 m
Position in range
62.8%
Seasonal percentile
30.7%
Record since
1995
Official operating levels (PREPA)
Overflow
67.87 m
Safety
62.18 m
Observation
58.82 m
Adjustments
57.00 m
Control
53.34 m
Out of service
51.52 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.
Drought context
Puerto Rico drought →U.S. Drought Monitor
Noneno drought
Week of 3 November 2026
Drought figures describe the ground around the reservoir, not its storage. Sources: U.S. Drought Monitor.
The chart plots where the water level sits inside the range this reservoir has recorded since 1995 (61.59 m to 68.21 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
On the map
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Dam and gauge
Design capacity
17.64 hm³
National Inventory of Dams
USGS gauge
50093045
Daily values, 15-minute source data
Municipality
Patillas
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.