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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Guajataca

Quebradillas

Safety

195.93m

642.81 ft

1.93 m above Observation

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

Compared with normal

1.45 m above normal for this date

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

Percentile 90 across 30 years of record.

Rank 400 of 443 readings from these dates. Rank 1 is the lowest.

The rank counts individual readings, not years.

Most recent year lower on this date: 2025.

Median
194.48 m
Minimum
186.40 m1997
Maximum
196.95 m2005
90th percentile
195.88 m

Level over time

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

Guajataca: level from July 25, 2026 to August 23, 2026, a net rise of 0.15 m.

August 23, 2026: 195.93 m.

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

From July 25, 2026 to August 23, 2026. Minimum 195.71 m, maximum 196.00 m.

The vertical scale runs from 195.70 m to 196.10 m and does not start at zero: these are metres above sea level.

5 bounds fall outside this chart’s scale.

Guajataca: level from July 25, 2026 to August 23, 2026, a net rise of 0.15 m.
Datem
July 25, 2026195.78
July 26, 2026195.76
July 27, 2026195.73
July 28, 2026195.76
July 29, 2026195.75
July 30, 2026195.74
July 31, 2026195.71
August 1, 2026195.77
August 2, 2026195.84
August 3, 2026195.86
August 4, 2026195.85
August 5, 2026195.83
August 6, 2026195.87
August 7, 2026195.95
August 8, 2026196.00
August 9, 2026196.00
August 10, 2026195.99
August 11, 2026195.97
August 12, 2026195.95
August 13, 2026195.97
August 14, 2026195.96
August 15, 2026195.94
August 16, 2026195.97
August 17, 2026195.97
August 18, 2026195.94
August 19, 2026195.92
August 20, 2026195.98
August 21, 2026195.98
August 22, 2026195.95
August 23, 2026195.93

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.

27 years of the 31 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: 195.93 m on August 23, 2026.

The vertical scale runs from 185.00 m to 200.00 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.

27 years of the 31 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1995194.00
1996194.64
1997187.45
1998193.94
1999194.97
2000191.76
2002194.19
2003193.33
2004193.76
2005196.37
2006195.28
2007195.17
2008190.76
2009194.30
2010195.39
2011195.88
2012194.31
2013194.73
2014191.74
2015195.72
2016196.09
2017196.43
2018191.51
2019194.92
2020194.00
2021194.43
2022192.09
2023189.52
2024195.07
2025194.76
2026195.93

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

126 days in Safety, since April 20, 2026.

The longest run in Safety on record: 529 days, from September 23, 2008 to March 26, 2010.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
ObservationJanuary 1, 2020April 18, 2020109
Operational adjustmentsApril 19, 2020May 28, 202040
ObservationMay 29, 2020July 16, 202049
SafetyJuly 17, 2020July 27, 202011
ObservationJuly 28, 2020July 30, 20203
SafetyJuly 31, 2020August 23, 202024
ObservationAugust 24, 2020September 7, 202015
SafetySeptember 8, 2020January 10, 2021125
ObservationJanuary 11, 2021May 22, 2021132
SafetyMay 23, 2021October 14, 2021144
OverflowOctober 15, 2021October 21, 20217
SafetyOctober 22, 2021January 7, 202278
ObservationJanuary 8, 2022June 21, 2022165
Operational adjustmentsJune 24, 2022June 25, 20222
ObservationJune 26, 2022June 29, 20224
Operational adjustmentsJune 30, 2022July 9, 202210
ObservationJuly 10, 2022September 19, 202272
SafetySeptember 20, 2022October 9, 202220
OverflowOctober 10, 2022October 23, 202214
SafetyOctober 24, 2022November 5, 202213
OverflowNovember 6, 2022November 7, 20222
SafetyNovember 8, 2022January 25, 202379
ObservationJanuary 26, 2023May 9, 2023104
Operational adjustmentsMay 10, 2023May 18, 20239
ObservationMay 19, 2023May 24, 20236
Operational adjustmentsMay 25, 2023May 25, 20231
ObservationMay 26, 2023June 9, 202315
Operational adjustmentsJune 10, 2023June 28, 202319
ObservationJune 29, 2023July 5, 20237
Operational adjustmentsJuly 6, 2023October 28, 2023115
ObservationOctober 29, 2023February 5, 2024100
Operational adjustmentsFebruary 6, 2024February 6, 20241
ObservationFebruary 7, 2024February 15, 20249
Operational adjustmentsFebruary 16, 2024February 16, 20241
ObservationFebruary 17, 2024February 27, 202411
Operational adjustmentsFebruary 28, 2024March 6, 20248
ObservationMarch 7, 2024March 13, 20247
Operational adjustmentsMarch 14, 2024April 23, 202441
ObservationApril 24, 2024May 8, 202415
SafetyMay 9, 2024December 30, 2024236
ObservationDecember 31, 2024May 3, 2025124
SafetyMay 4, 2025April 16, 2026345
OverflowApril 17, 2026April 19, 20263
SafetyApril 20, 2026August 23, 2026126

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.