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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Guayabal

Juana Díaz

Observation

102.52m

336.35 ft

0.72 m above Operational adjustments

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

Compared with normal

1.29 m below normal for this date

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

Percentile 10 across 31 years of record.

Rank 45 of 463 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
103.80 m
Minimum
100.16 m1997
Maximum
104.01 m2011
90th percentile
103.90 m

Level over time

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

Guayabal: level from July 25, 2026 to August 23, 2026, a net fall of 0.26 m.

August 23, 2026: 102.52 m.

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

From July 25, 2026 to August 23, 2026. Minimum 102.24 m, maximum 102.78 m.

The vertical scale runs from 102.20 m to 102.80 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.

Guayabal: level from July 25, 2026 to August 23, 2026, a net fall of 0.26 m.
Datem
July 25, 2026102.78
July 26, 2026102.73
July 27, 2026102.69
July 28, 2026102.65
July 29, 2026102.62
July 30, 2026102.60
July 31, 2026102.56
August 1, 2026102.52
August 2, 2026102.49
August 3, 2026102.44
August 4, 2026102.41
August 5, 2026102.41
August 6, 2026102.38
August 7, 2026102.34
August 8, 2026102.30
August 9, 2026102.28
August 10, 2026102.26
August 11, 2026102.24
August 12, 2026102.25
August 13, 2026102.36
August 14, 2026102.38
August 15, 2026102.37
August 16, 2026102.37
August 17, 2026102.36
August 18, 2026102.35
August 19, 2026102.33
August 20, 2026102.38
August 21, 2026102.44
August 22, 2026102.50
August 23, 2026102.52

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.

3 years of the 32 with a reading on August 23 were below the most recent level.

From 1995 to 2026.

The dashed line is this reservoir’s most recent level: 102.52 m on August 23, 2026.

The vertical scale runs from 100.00 m to 104.00 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.

3 years of the 32 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1995103.90
1996103.89
1997100.28
1998103.88
1999103.88
2000103.78
2001103.71
2002103.66
2003102.83
2004103.92
2005103.89
2006103.84
2007103.50
2008103.82
2009103.41
2010103.85
2011103.94
2012103.79
2013103.89
2014103.82
2015103.20
2016103.55
2017103.91
2018103.21
2019102.27
2020103.94
2021102.96
2022102.52
2023103.84
2024103.84
2025103.87
2026102.52

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

28 days in Observation, since July 27, 2026.

The longest run in Observation on record: 197 days, from February 22, 2019 to September 6, 2019.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020May 13, 2020134
ObservationMay 14, 2020June 10, 202028
SafetyJune 11, 2020June 17, 20207
ObservationJune 18, 2020July 2, 202015
SafetyJuly 3, 2020July 5, 20203
ObservationJuly 6, 2020July 7, 20202
SafetyJuly 8, 2020July 11, 20204
ObservationJuly 12, 2020July 18, 20207
SafetyJuly 19, 2020November 9, 2020114
OverflowNovember 10, 2020November 10, 20201
SafetyNovember 11, 2020November 11, 20201
OverflowNovember 12, 2020November 12, 20201
SafetyNovember 13, 2020September 5, 2021297
ObservationSeptember 6, 2021September 10, 20215
SafetySeptember 11, 2021September 11, 20211
ObservationSeptember 12, 2021September 13, 20212
SafetySeptember 14, 2021January 28, 2022133
ObservationJanuary 29, 2022February 3, 20226
SafetyFebruary 4, 2022February 17, 202214
ObservationFebruary 18, 2022March 2, 202213
SafetyMarch 3, 2022March 21, 202219
ObservationMarch 22, 2022May 18, 202258
Operational adjustmentsMay 19, 2022May 23, 20225
ObservationMay 24, 2022August 31, 2022100
SafetySeptember 1, 2022September 19, 202219
OverflowSeptember 20, 2022September 20, 20221
SafetySeptember 21, 2022October 11, 202221
OverflowOctober 12, 2022October 12, 20221
SafetyOctober 13, 2022November 6, 202225
OverflowNovember 7, 2022November 7, 20221
SafetyNovember 8, 2022August 25, 2023291
OverflowAugust 26, 2023August 26, 20231
SafetyAugust 27, 2023October 28, 202363
OverflowOctober 29, 2023October 29, 20231
SafetyOctober 30, 2023June 3, 2024218
OverflowJune 4, 2024June 4, 20241
SafetyJune 5, 2024September 24, 2025477
OverflowSeptember 25, 2025September 25, 20251
SafetySeptember 26, 2025February 1, 2026129
OverflowFebruary 2, 2026February 2, 20261
SafetyFebruary 3, 2026July 26, 2026174
ObservationJuly 27, 2026August 23, 202628

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.