Each bar shows where a reservoir sits between its Control floor (the level at which rationing controls begin, 0%) and its Desborde crest (the spillway, 100%). It is a threshold-relative fill gauge, not percent-of-volume. Bars are colored by the alert band the reservoir is currently in; the most-concerning reservoirs sort to the top.
Each bar is normalized to a reservoir's original design storage (100%): the solid blue part is the share still usable as of the last bathymetric study, the faded brown part has silted in. 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, which is why a reservoir can hit rationing levels after only a short dry spell. Hover for the absolute volumes (Mm³). Source: DRNA/PRASA Plan Integral de Recursos de Agua (2016), Tabla 5.5 — a 2015 snapshot, so real losses are now somewhat larger.
| Reservoir | Municipio | Operator | Level (m) | Status | Fill | Cap (Mm³) | Yield (MGD) | 24h Δ | Updated |
|---|---|---|---|---|---|---|---|---|---|
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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.