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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

La Plata

Comerío

Observation

45.34m

148.75 ft

0.44 m above Operational adjustments

Data as of August 23, 2026 · Reading taken at 5:00 AM

Compared with normal

4.28 m below normal for this date

A ±7-day window around August 23, 2026, this reservoir's own most recent reading.

Percentile 21 across 37 years of record.

Rank 117 of 549 readings from these dates. Rank 1 is the lowest.

The rank counts individual readings, not years.

Most recent year lower on this date: 2022.

Median
49.62 m
Minimum
33.60 m1994
Maximum
51.20 m2024
90th percentile
50.89 m

Level over time

Resolution follows the range: daily up to a year, weekly at five years, monthly across the whole record.

La Plata: level from July 25, 2026 to August 23, 2026, a net fall of 2.24 m.

August 23, 2026: 45.34 m.

Hover the chart or use the arrow keys to read a point.

From July 25, 2026 to August 23, 2026. Minimum 45.34 m, maximum 47.58 m.

The vertical scale runs from 45.00 m to 48.00 m and does not start at zero: these are metres above sea level.

The dashed lines are the alert bounds AAA publishes today. The record keeps no history of those bounds, so we do not know whether they were the same in the past.

Today the reservoir is in Observation.

4 bounds fall outside this chart’s scale.

La Plata: level from July 25, 2026 to August 23, 2026, a net fall of 2.24 m.
Datem
July 25, 202647.58
July 26, 202647.52
July 27, 202647.45
July 28, 202647.37
July 29, 202647.29
July 30, 202647.21
July 31, 202647.13
August 1, 202647.06
August 2, 202646.97
August 3, 202646.88
August 4, 202646.79
August 5, 202646.72
August 6, 202646.63
August 7, 202646.54
August 8, 202646.46
August 9, 202646.37
August 10, 202646.29
August 11, 202646.19
August 12, 202646.15
August 13, 202646.10
August 14, 202646.01
August 15, 202645.94
August 16, 202645.87
August 17, 202645.79
August 18, 202645.70
August 19, 202645.61
August 20, 202645.55
August 21, 202645.48
August 22, 202645.41
August 23, 202645.34

Projection

Disabled

This portal does not publish projections yet. Saying when a reservoir would reach its next phase is a claim about the future of a great many people's water, and before publishing one we want the rule for when it may and may not be made written down.

Every August 23 in the record

Compare another date

Hover the dots or use the arrow keys.

7 years of the 38 with a reading on August 23 were below the most recent level.

From 1989 to 2026.

The dashed line is this reservoir’s most recent level: 45.34 m on August 23, 2026.

The vertical scale runs from 30.00 m to 60.00 m and does not start at zero: these are metres above sea level.

Years with no reading on this date are not in the record and are left as empty space on the axis.

Years below the most recent level are marked with a filled dot.

This counts years. The rank in the block above counts readings.

7 years of the 38 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
198945.42
199045.64
199145.53
199246.59
199349.62
199434.02
199541.89
199650.18
199741.59
199845.73
199949.51
200049.64
200147.73
200247.10
200350.68
200450.29
200550.30
200650.24
200746.05
200841.96
200950.22
201050.47
201150.53
201250.02
201350.65
201445.23
201534.25
201650.72
201750.87
201849.12
201946.72
202050.09
202149.83
202244.11
202350.68
202451.17
202551.11
202645.34

When it has been in each phase

Hover the bands or use the arrow keys.

Each band is one run in one phase, since January 1, 2020.

The axis is calendar time, from January 1, 2020 to August 23, 2026. Stretches with no bulletin are left blank.

Current run

31 days in Observation, since July 24, 2026.

The longest run in Observation on record: 445 days, from January 7, 1992 to March 26, 1993.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020January 23, 202023
OverflowJanuary 24, 2020January 24, 20201
SafetyJanuary 25, 2020February 25, 202032
OverflowFebruary 26, 2020February 26, 20201
SafetyFebruary 27, 2020March 19, 202022
OverflowMarch 20, 2020March 20, 20201
SafetyMarch 21, 2020April 4, 202015
OverflowApril 5, 2020April 5, 20201
SafetyApril 6, 2020October 17, 2021560
OverflowOctober 18, 2021October 18, 20211
SafetyOctober 19, 2021June 3, 2022225
ObservationJune 4, 2022July 28, 202255
Operational adjustmentsJuly 29, 2022September 5, 202239
ObservationSeptember 6, 2022September 6, 20221
SafetySeptember 7, 2022September 17, 202211
ObservationSeptember 18, 2022September 18, 20221
SafetySeptember 19, 2022February 10, 2024510
OverflowFebruary 11, 2024February 21, 202411
SafetyFebruary 22, 2024March 4, 202412
OverflowMarch 5, 2024March 13, 20249
SafetyMarch 14, 2024April 1, 202419
OverflowApril 2, 2024April 8, 20247
SafetyApril 9, 2024May 18, 202440
OverflowMay 19, 2024May 19, 20241
SafetyMay 20, 2024May 20, 20241
OverflowMay 21, 2024May 21, 20241
SafetyMay 22, 2024December 14, 2024207
OverflowDecember 15, 2024December 15, 20241
SafetyDecember 16, 2024March 2, 202577
OverflowMarch 3, 2025March 3, 20251
SafetyMarch 4, 2025June 29, 2025118
OverflowJune 30, 2025July 7, 20258
SafetyJuly 8, 2025July 20, 202513
OverflowJuly 21, 2025July 22, 20252
SafetyJuly 23, 2025July 25, 20253
OverflowJuly 26, 2025July 26, 20251
SafetyJuly 27, 2025August 2, 20257
OverflowAugust 3, 2025August 3, 20251
SafetyAugust 4, 2025August 4, 20251
OverflowAugust 5, 2025August 6, 20252
SafetyAugust 7, 2025October 9, 202564
OverflowOctober 10, 2025October 10, 20251
SafetyOctober 11, 2025April 14, 2026186
OverflowApril 15, 2026April 15, 20261
SafetyApril 16, 2026July 23, 202699
ObservationJuly 24, 2026August 23, 202631

How we read the data

Every figure on this portal is the 5:00 AM AST reading from the USGS gauge, every day, at every reservoir. AAA's daily bulletin is drawn at 4:55 AM and carries the freshest reading that had arrived by press time; the gauges transmit once an hour, and the 5:00 AM reading is published around 5:57 AM. On days when levels move quickly the two figures can therefore differ by about a centimetre. Each is correct for its own cut-off. Ours holds the same 24-hour interval every day, which is what makes our day-over-day changes directly comparable to one another.

We read the same USGS gauges that underpin the bulletin. The alert phases (Overflow, Safety, Observation, Operational adjustments, Control) are the thresholds AAA publishes for each reservoir; AAA prints them in Spanish, as Desborde, Seguridad, Observación, Ajustes and Control.

Source

Data: U.S. Geological Survey (USGS)

Provisional data

Provisional data: values are preliminary, have not been reviewed or approved by the U.S. Geological Survey, and are subject to revision or removal as the record is finalized. Do not use them for decisions involving personal or public safety, or property.

Daily reservoir level bulletin: Autoridad de Acueductos y Alcantarillados de Puerto Rico.

This portal is not an official channel of the Autoridad de Acueductos y Alcantarillados. For service notices, consult AAA.