Analytics / Water

Puerto Rico Reservoir Levels

Independent level comparison built from USGS sensor data against PRASA's published operating thresholds — not an official water-supply forecast.

Monitor
Live gauge readings Refresh
15–60 minutes Sources
USGS / PRASA
Reservoirs reporting — Connecting to gauge network Island-wide operating snapshot
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Fetching the latest reservoir readings.

Where they are

Level source: USGS Threshold source: PRASA Each dot is a damsite gauge, colored by the PRASA alert band its current level falls in. Select one for its detail and its level history.

Position within operating range 0% = Control line (lowest published) · 100% = Desborde crest (spillover)

Level source: USGS Threshold source: PRASA Where each measured level sits between two of PRASA's official published lines.

Each bar shows where a reservoir's measured level sits between its Control floor (PRASA's lowest published operating line, 0%) and its Desborde crest (the spillway, 100%). This is a position within the operating range, not percent of total water volume — a reservoir at 62% here is 62% of the way from its Control line up to the spillway, not holding 62% of its water. Bars are colored by the alert band the reservoir is currently in; reservoirs in the lowest operating bands sort to the top.

Estimated usable capacity as of 2015 Historical · DRNA/PRASA PIRA (2016) · % of original

Historical · 2015 From the last published bathymetric survey. No newer survey is included here, so present-day losses may be larger.

Each bar is normalized to a reservoir's original design storage (100%): the solid blue part is the share still usable as of the 2015 survey, the faded brown part had silted in by then. Bars are ordered worst-first, so you can compare proportional loss regardless of reservoir size — Puerto Rico's older dams have lost heavily, several down to a third or less of their built capacity, reducing the water-storage buffer available during dry periods. Hover for the absolute volumes (Mm³). Source: DRNA/PRASA Plan Integral de Recursos de Agua (2016), Tabla 5.5 — a 2015 snapshot. Present-day siltation may be greater, but no newer survey is included here.

Reservoir status

Level source: USGS Live gauge readings. The Status column compares each level to PRASA's official bands; Position is location within the operating range, not percent of total volume.
Show all reservoirs as a sortable table
Reservoir Municipio Operator Level (m) Status Position Cap (Mm³) Yield (MGD) 24h Δ Updated
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Level history gauge elevation vs the five alert lines

Data source: USGS Water Services instantaneous values, parameter 72376 (reservoir elevation above local mean sea level, meters), read from the damsite gauges the USGS operates for PR's principal embalses. Alert bands (Desborde / Seguridad / Observación / Ajustes / Control): transcribed from PRASA's official "Monitoreo Diario de Embalses" chart — independently corroborated by the dam-crest elevations in PIRA Tabla 3.5 (agreement within ~1 m for ungated-overflow dams). Reservoir facts (storage & sedimentation, safe yield, dam type/size, basin, year, owner, uses): DRNA/PRASA Plan Integral de Recursos de Agua (PIRA), Junio 2016 — Tabla 3.5 (información general) and Tabla 5.5 (sedimentación); a 2015 snapshot. This page is not affiliated with USGS, PRASA, or PREPA; the status read is an independent indicator, not an official rationing notice.