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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Caonillas

Utuado

Safety

251.12m

823.89 ft

3.12 m above Observation

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

Compared with normal

2.66 m above normal for this date

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

Percentile 80 across 31 years of record.

Rank 359 of 450 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
248.46 m
Minimum
226.94 m1994
Maximum
252.57 m2011
90th percentile
251.70 m

Level over time

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

Caonillas: level from July 25, 2026 to August 23, 2026, no net change.

August 23, 2026: 251.12 m.

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

From July 25, 2026 to August 23, 2026. Minimum 250.70 m, maximum 251.44 m.

The vertical scale runs from 250.60 m to 251.60 m and does not start at zero: these are metres above sea level.

5 bounds fall outside this chart’s scale.

Caonillas: level from July 25, 2026 to August 23, 2026, no net change.
Datem
July 25, 2026251.12
July 26, 2026251.13
July 27, 2026251.17
July 28, 2026251.24
July 29, 2026251.27
July 30, 2026251.29
July 31, 2026251.30
August 1, 2026251.36
August 2, 2026251.40
August 3, 2026251.41
August 4, 2026251.43
August 5, 2026251.44
August 6, 2026250.90
August 7, 2026250.70
August 8, 2026250.73
August 9, 2026250.74
August 10, 2026250.76
August 11, 2026250.77
August 12, 2026250.80
August 13, 2026250.92
August 14, 2026250.97
August 15, 2026250.98
August 16, 2026251.01
August 17, 2026251.03
August 18, 2026251.05
August 19, 2026251.06
August 20, 2026251.08
August 21, 2026251.10
August 22, 2026251.11
August 23, 2026251.12

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.

23 years of the 31 with a reading on August 23 were below the most recent level.

From 1991 to 2026.

The dashed line is this reservoir’s most recent level: 251.12 m on August 23, 2026.

The vertical scale runs from 220.00 m to 260.00 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.

23 years of the 31 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1991238.18
1992239.18
1993242.70
1994227.07
1995240.32
1996238.79
1997231.29
1998251.16
2001244.17
2004244.91
2005249.69
2006244.31
2007245.58
2009244.31
2010250.44
2011251.21
2012242.38
2013251.17
2014243.81
2015250.16
2016247.99
2017251.78
2018250.61
2019251.40
2020251.45
2021251.48
2022250.99
2023249.36
2024248.30
2025248.78
2026251.12

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

113 days in Safety, since May 3, 2026.

The longest run in Safety on record: 373 days, from September 14, 2020 to September 21, 2021.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020June 9, 2020161
OverflowJune 10, 2020June 10, 20201
SafetyJune 11, 2020July 29, 202049
OverflowJuly 30, 2020July 31, 20202
SafetyAugust 1, 2020September 12, 202042
OverflowSeptember 13, 2020September 13, 20201
SafetySeptember 14, 2020September 21, 2021373
OverflowSeptember 22, 2021September 22, 20211
SafetySeptember 23, 2021September 29, 20217
OverflowSeptember 30, 2021October 1, 20212
SafetyOctober 2, 2021October 16, 202115
OverflowOctober 17, 2021October 19, 20213
SafetyOctober 20, 2021April 28, 2022191
ObservationApril 29, 2022May 7, 20227
SafetyMay 8, 2022May 13, 20226
ObservationMay 14, 2022May 31, 202218
SafetyJune 1, 2022September 18, 2022109
OverflowSeptember 19, 2022September 25, 20227
SafetySeptember 26, 2022September 26, 20221
OverflowSeptember 27, 2022September 27, 20221
SafetySeptember 28, 2022September 28, 20221
OverflowSeptember 29, 2022September 29, 20221
SafetySeptember 30, 2022October 4, 20225
OverflowOctober 5, 2022October 5, 20221
SafetyOctober 6, 2022October 7, 20222
OverflowOctober 8, 2022October 8, 20221
SafetyOctober 9, 2022October 9, 20221
OverflowOctober 10, 2022October 10, 20221
SafetyOctober 11, 2022October 11, 20221
OverflowOctober 12, 2022October 18, 20227
SafetyOctober 19, 2022October 22, 20224
OverflowOctober 23, 2022October 24, 20222
SafetyOctober 25, 2022October 25, 20221
OverflowOctober 26, 2022October 29, 20224
SafetyOctober 30, 2022October 31, 20222
OverflowNovember 1, 2022November 2, 20222
SafetyNovember 3, 2022November 3, 20221
OverflowNovember 4, 2022November 9, 20226
SafetyNovember 10, 2022November 10, 20221
OverflowNovember 11, 2022November 11, 20221
SafetyNovember 12, 2022January 11, 202361
OverflowJanuary 12, 2023January 12, 20231
SafetyJanuary 13, 2023January 14, 20232
OverflowJanuary 15, 2023January 17, 20233
SafetyJanuary 18, 2023May 2, 2023105
OverflowMay 3, 2023May 4, 20232
SafetyMay 5, 2023May 12, 20238
OverflowMay 13, 2023May 18, 20236
SafetyMay 19, 2023May 21, 20233
OverflowMay 22, 2023May 22, 20231
SafetyMay 23, 2023September 19, 2023120
OverflowSeptember 20, 2023September 22, 20233
SafetySeptember 23, 2023October 27, 202335
OverflowOctober 28, 2023October 28, 20231
SafetyOctober 29, 2023April 18, 2024171
OverflowApril 19, 2024April 20, 20242
SafetyApril 21, 2024April 23, 20243
OverflowApril 24, 2024April 25, 20242
SafetyApril 26, 2024April 26, 20241
OverflowApril 27, 2024April 27, 20241
SafetyApril 28, 2024May 3, 20246
OverflowMay 4, 2024May 4, 20241
SafetyMay 5, 2024May 6, 20242
OverflowMay 7, 2024May 10, 20244
SafetyMay 11, 2024June 3, 202424
OverflowJune 4, 2024June 4, 20241
SafetyJune 5, 2024August 14, 202471
OverflowAugust 15, 2024August 15, 20241
SafetyAugust 16, 2024September 7, 202423
OverflowSeptember 8, 2024September 8, 20241
SafetySeptember 9, 2024September 9, 20241
OverflowSeptember 10, 2024September 12, 20243
SafetySeptember 13, 2024September 13, 20241
OverflowSeptember 14, 2024September 14, 20241
SafetySeptember 15, 2024September 24, 202410
OverflowSeptember 25, 2024September 25, 20241
SafetySeptember 26, 2024April 26, 2025213
OverflowApril 27, 2025April 27, 20251
SafetyApril 28, 2025April 28, 20251
OverflowApril 29, 2025May 6, 20258
SafetyMay 7, 2025May 7, 20251
OverflowMay 8, 2025May 8, 20251
SafetyMay 9, 2025September 19, 2025130
OverflowSeptember 20, 2025September 20, 20251
SafetySeptember 21, 2025October 9, 202519
OverflowOctober 10, 2025October 10, 20251
SafetyOctober 11, 2025March 24, 2026165
OverflowMarch 25, 2026March 25, 20261
SafetyMarch 26, 2026March 27, 20262
OverflowMarch 28, 2026March 28, 20261
SafetyMarch 29, 2026April 11, 202614
OverflowApril 12, 2026April 12, 20261
SafetyApril 13, 2026April 14, 20262
OverflowApril 15, 2026April 15, 20261
SafetyApril 16, 2026May 1, 202616
OverflowMay 2, 2026May 2, 20261
SafetyMay 3, 2026August 23, 2026113

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.