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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Cidra

Cidra

Operational adjustments

400.10m

1,312.67 ft

1.73 m above Control

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

Compared with normal

1.41 m below normal for this date

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

Percentile 34 across 38 years of record.

Rank 190 of 554 readings from these dates. Rank 1 is the lowest.

The rank counts individual readings, not years.

Most recent year lower on this date: 2015.

Median
401.51 m
Minimum
395.87 m1994
Maximum
403.67 m2011
90th percentile
403.06 m

Level over time

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

Cidra: level from July 25, 2026 to August 23, 2026, a net fall of 0.27 m.

August 23, 2026: 400.10 m.

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

From July 25, 2026 to August 23, 2026. Minimum 400.10 m, maximum 400.38 m.

The vertical scale runs from 400.00 m to 400.40 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 Operational adjustments.

4 bounds fall outside this chart’s scale.

Cidra: level from July 25, 2026 to August 23, 2026, a net fall of 0.27 m.
Datem
July 25, 2026400.38
July 26, 2026400.35
July 27, 2026400.34
July 28, 2026400.31
July 29, 2026400.28
July 30, 2026400.27
July 31, 2026400.24
August 1, 2026400.22
August 2, 2026400.20
August 3, 2026400.19
August 4, 2026400.18
August 5, 2026400.19
August 6, 2026400.18
August 7, 2026400.16
August 8, 2026400.15
August 9, 2026400.13
August 10, 2026400.11
August 11, 2026400.10
August 12, 2026400.15
August 13, 2026400.17
August 14, 2026400.17
August 15, 2026400.17
August 16, 2026400.17
August 17, 2026400.15
August 18, 2026400.14
August 19, 2026400.13
August 20, 2026400.13
August 21, 2026400.12
August 22, 2026400.11
August 23, 2026400.10

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.

14 years of the 38 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: 400.10 m on August 23, 2026.

The vertical scale runs from 395.00 m to 405.00 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.

14 years of the 38 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1988399.59
1989399.30
1990398.88
1991400.00
1992400.69
1993402.79
1994395.87
1996403.06
1997399.56
1998397.96
1999400.94
2000399.82
2001397.14
2002399.76
2003399.60
2004402.90
2005403.01
2006402.30
2007399.85
2008399.67
2009403.05
2010403.12
2011403.67
2012400.69
2013403.06
2014401.53
2015399.38
2016403.00
2017403.12
2018401.81
2019401.46
2020402.94
2021402.10
2022401.52
2023402.17
2024403.08
2025402.33
2026400.10

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

23 days in Operational adjustments, since August 1, 2026.

The longest run in Operational adjustments on record: 271 days, from December 5, 1996 to September 1, 1997.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020March 9, 202069
OverflowMarch 10, 2020April 12, 202034
SafetyApril 13, 2020June 6, 202055
ObservationJune 7, 2020July 29, 202053
SafetyJuly 30, 2020October 27, 202090
OverflowOctober 28, 2020November 6, 202010
SafetyNovember 7, 2020November 8, 20202
OverflowNovember 9, 2020December 15, 202037
SafetyDecember 16, 2020December 28, 202013
OverflowDecember 29, 2020January 11, 202114
SafetyJanuary 12, 2021January 31, 202120
OverflowFebruary 1, 2021March 20, 202148
SafetyMarch 21, 2021May 15, 202156
ObservationMay 16, 2021June 9, 202125
SafetyJune 10, 2021June 14, 20215
ObservationJune 15, 2021June 22, 20218
SafetyJune 23, 2021February 6, 2022229
OverflowFebruary 7, 2022February 20, 202214
SafetyFebruary 21, 2022February 21, 20221
OverflowFebruary 22, 2022February 22, 20221
SafetyFebruary 23, 2022February 23, 20221
OverflowFebruary 24, 2022February 24, 20221
SafetyFebruary 25, 2022March 6, 202210
OverflowMarch 7, 2022March 7, 20221
SafetyMarch 8, 2022March 8, 20221
OverflowMarch 9, 2022March 16, 20228
SafetyMarch 17, 2022June 19, 202295
ObservationJune 20, 2022July 9, 202220
SafetyJuly 10, 2022July 10, 20221
ObservationJuly 11, 2022July 11, 20221
SafetyJuly 12, 2022July 19, 20228
ObservationJuly 20, 2022September 4, 202247
SafetySeptember 5, 2022September 18, 202214
OverflowSeptember 19, 2022October 5, 202217
SafetyOctober 6, 2022October 27, 202222
OverflowOctober 28, 2022March 13, 2023137
SafetyMarch 14, 2023March 16, 20233
OverflowMarch 17, 2023March 21, 20235
SafetyMarch 22, 2023April 27, 202337
OverflowApril 28, 2023May 1, 20234
SafetyMay 2, 2023April 19, 2024354
OverflowApril 20, 2024May 20, 202431
SafetyMay 21, 2024May 22, 20242
OverflowMay 23, 2024May 30, 20248
SafetyMay 31, 2024June 2, 20243
OverflowJune 3, 2024June 10, 20248
SafetyJune 11, 2024July 31, 202451
OverflowAugust 1, 2024August 5, 20245
SafetyAugust 6, 2024August 13, 20248
OverflowAugust 14, 2024September 1, 202419
SafetySeptember 2, 2024September 4, 20243
OverflowSeptember 5, 2024September 7, 20243
SafetySeptember 8, 2024September 8, 20241
OverflowSeptember 9, 2024September 14, 20246
SafetySeptember 15, 2024November 10, 202457
OverflowNovember 11, 2024November 27, 202417
SafetyNovember 28, 2024March 5, 202598
OverflowMarch 6, 2025March 7, 20252
SafetyMarch 8, 2025March 13, 20256
OverflowMarch 14, 2025March 21, 20258
SafetyMarch 22, 2025April 20, 202530
OverflowApril 21, 2025April 21, 20251
SafetyApril 22, 2025April 26, 20255
OverflowApril 27, 2025June 2, 202537
SafetyJune 3, 2025October 9, 2025129
ObservationOctober 10, 2025February 17, 2026131
SafetyFebruary 18, 2026February 18, 20261
ObservationFebruary 19, 2026April 1, 202642
SafetyApril 2, 2026April 24, 202623
ObservationApril 25, 2026July 31, 202698
Operational adjustmentsAugust 1, 2026August 23, 202623

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.