Skip to content

Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Matrullas

Orocovis

Safety

733.11m

2,405.23 ft

0.07 m above Observation

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

Compared with normal

1.98 m below normal for this date

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

Percentile 28 across 35 years of record.

Rank 141 of 503 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
735.09 m
Minimum
725.08 m1994
Maximum
736.51 m2011
90th percentile
736.21 m

Level over time

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

Matrullas: level from July 25, 2026 to August 23, 2026, a net rise of 0.20 m.

August 23, 2026: 733.11 m.

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

From July 25, 2026 to August 23, 2026. Minimum 732.92 m, maximum 733.11 m.

The vertical scale runs from 732.90 m to 733.15 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 Safety.

4 bounds fall outside this chart’s scale.

Matrullas: level from July 25, 2026 to August 23, 2026, a net rise of 0.20 m.
Datem
July 25, 2026732.92
July 26, 2026732.93
July 27, 2026732.93
July 28, 2026732.94
July 29, 2026732.94
July 30, 2026732.95
July 31, 2026732.95
August 1, 2026732.95
August 2, 2026732.96
August 3, 2026732.96
August 4, 2026732.96
August 5, 2026732.98
August 6, 2026732.99
August 7, 2026732.99
August 8, 2026732.99
August 9, 2026732.99
August 10, 2026732.99
August 11, 2026732.99
August 12, 2026733.00
August 13, 2026733.09
August 14, 2026733.10
August 15, 2026733.10
August 16, 2026733.10
August 17, 2026733.10
August 18, 2026733.10
August 19, 2026733.10
August 20, 2026733.11
August 21, 2026733.11
August 22, 2026733.11
August 23, 2026733.11

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.

10 years of the 34 with a reading on August 23 were below the most recent level.

From 1988 to 2026.

The dashed line is this reservoir’s most recent level: 733.11 m on August 23, 2026.

The vertical scale runs from 725.00 m to 740.00 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.

10 years of the 34 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1988731.27
1989730.47
1990732.85
1991735.14
1992734.96
1993733.54
1994725.13
1996735.70
1997732.42
1998736.19
1999736.04
2002735.81
2003733.06
2004735.97
2005736.17
2006735.34
2007735.89
2008732.80
2010736.22
2011736.44
2012735.80
2013735.59
2014736.24
2015734.81
2016736.19
2017736.08
2018734.19
2020735.93
2021732.59
2022733.65
2023731.52
2024735.45
2025732.13
2026733.11

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

11 days in Safety, since August 13, 2026.

The longest run in Safety on record: 1,103 days, from August 29, 1990 to September 7, 1993.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
OverflowJanuary 1, 2020January 8, 20208
SafetyJanuary 9, 2020January 26, 202018
OverflowJanuary 27, 2020February 7, 202012
SafetyFebruary 8, 2020February 8, 20201
OverflowFebruary 9, 2020February 11, 20203
SafetyFebruary 12, 2020March 2, 202020
OverflowMarch 3, 2020March 5, 20203
SafetyMarch 6, 2020March 9, 20204
OverflowMarch 10, 2020April 17, 202039
SafetyApril 18, 2020April 18, 20201
OverflowApril 19, 2020April 21, 20203
SafetyApril 22, 2020July 7, 202077
ObservationJuly 8, 2020July 30, 202023
SafetyJuly 31, 2020September 7, 202039
OverflowSeptember 8, 2020October 3, 202026
SafetyOctober 4, 2020October 4, 20201
OverflowOctober 5, 2020October 15, 202011
SafetyOctober 16, 2020October 17, 20202
OverflowOctober 18, 2020December 1, 202045
SafetyDecember 2, 2020December 28, 202027
OverflowDecember 29, 2020January 12, 202115
SafetyJanuary 13, 2021March 23, 202170
ObservationMarch 24, 2021April 22, 202130
Operational adjustmentsApril 23, 2021May 19, 202127
ControlMay 20, 2021May 29, 202110
Operational adjustmentsMay 30, 2021June 1, 20213
ControlJune 2, 2021June 20, 202119
Operational adjustmentsJune 21, 2021July 25, 202135
ObservationJuly 26, 2021September 21, 202158
SafetySeptember 22, 2021October 18, 202127
OverflowOctober 19, 2021December 9, 202152
SafetyDecember 10, 2021April 6, 2022118
ObservationApril 28, 2022May 24, 202227
SafetyMay 25, 2022July 9, 202246
ObservationJuly 10, 2022July 10, 20221
SafetyJuly 11, 2022July 11, 20221
ObservationJuly 12, 2022August 17, 202237
SafetyAugust 18, 2022September 14, 202228
OverflowSeptember 21, 2022November 29, 202270
SafetyNovember 30, 2022December 6, 20227
OverflowDecember 7, 2022December 15, 20229
SafetyDecember 16, 2022January 11, 202327
OverflowJanuary 12, 2023January 19, 20238
SafetyJanuary 20, 2023April 7, 202378
ObservationApril 8, 2023May 23, 202346
SafetyMay 24, 2023June 21, 202329
ObservationJune 22, 2023June 28, 20237
SafetyJune 29, 2023July 14, 202316
ObservationJuly 15, 2023September 19, 202365
SafetySeptember 20, 2023October 28, 202339
OverflowOctober 29, 2023November 16, 202319
SafetyNovember 17, 2023March 13, 2024118
ObservationMarch 14, 2024April 18, 202436
SafetyApril 19, 2024May 3, 202415
OverflowMay 4, 2024May 17, 202414
SafetyMay 18, 2024May 22, 20245
OverflowMay 23, 2024May 31, 20249
SafetyJune 1, 2024June 2, 20242
OverflowJune 3, 2024June 6, 20244
SafetyJune 7, 2024June 8, 20242
OverflowJune 9, 2024June 11, 20243
SafetyJune 12, 2024August 14, 202464
OverflowAugust 15, 2024August 17, 20243
SafetyAugust 18, 2024October 11, 202455
ObservationOctober 12, 2024November 10, 202430
SafetyNovember 11, 2024April 29, 2025168
OverflowApril 30, 2025June 4, 202527
SafetyJune 5, 2025June 6, 20252
OverflowJune 7, 2025June 12, 20256
SafetyJune 13, 2025July 9, 202527
ObservationJuly 10, 2025August 12, 202532
Operational adjustmentsAugust 13, 2025August 17, 20255
ObservationAugust 18, 2025August 26, 20259
Operational adjustmentsAugust 27, 2025September 6, 202511
ObservationSeptember 7, 2025September 9, 20253
SafetySeptember 10, 2025September 25, 202515
OverflowSeptember 26, 2025September 30, 20255
SafetyOctober 1, 2025October 9, 20258
OverflowOctober 10, 2025October 14, 20255
SafetyOctober 15, 2025December 15, 202561
OverflowDecember 16, 2025January 21, 202637
SafetyJanuary 22, 2026February 1, 202611
OverflowFebruary 2, 2026March 6, 202633
SafetyMarch 7, 2026March 7, 20261
OverflowMarch 8, 2026March 9, 20262
SafetyMarch 10, 2026March 22, 202613
OverflowMarch 23, 2026April 10, 202619
SafetyApril 11, 2026April 11, 20261
OverflowApril 12, 2026April 22, 202611
SafetyApril 23, 2026April 28, 20266
OverflowApril 29, 2026May 13, 202615
SafetyMay 14, 2026July 15, 202663
ObservationJuly 16, 2026August 12, 202628
SafetyAugust 13, 2026August 23, 202611

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.