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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Carraízo

Trujillo Alto

Operational adjustments

37.40m

122.71 ft

0.40 m above Control

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

Compared with normal

3.30 m below normal for this date

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

Percentile 6 across 38 years of record.

Rank 37 of 563 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
40.70 m
Minimum
33.13 m1994
Maximum
41.24 m1989
90th percentile
40.94 m

Level over time

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

Carraízo: level from July 25, 2026 to August 23, 2026, a net fall of 1.19 m.

August 23, 2026: 37.40 m.

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

From July 25, 2026 to August 23, 2026. Minimum 37.40 m, maximum 38.59 m.

The vertical scale runs from 37.00 m to 39.00 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.

3 bounds fall outside this chart’s scale.

Carraízo: level from July 25, 2026 to August 23, 2026, a net fall of 1.19 m.
Datem
July 25, 202638.59
July 26, 202638.51
July 27, 202638.42
July 28, 202638.33
July 29, 202638.22
July 30, 202638.13
July 31, 202638.04
August 1, 202637.95
August 2, 202637.87
August 3, 202637.81
August 4, 202637.74
August 5, 202637.72
August 6, 202637.69
August 7, 202637.64
August 8, 202637.58
August 9, 202637.53
August 10, 202637.48
August 11, 202637.43
August 12, 202637.57
August 13, 202637.80
August 14, 202637.86
August 15, 202637.84
August 16, 202637.81
August 17, 202637.75
August 18, 202637.69
August 19, 202637.62
August 20, 202637.57
August 21, 202637.51
August 22, 202637.46
August 23, 202637.40

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.

2 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: 37.40 m on August 23, 2026.

The vertical scale runs from 30.00 m to 45.00 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.

2 years of the 38 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
198840.82
198941.17
199040.47
199140.40
199240.81
199340.57
199433.35
199541.08
199740.96
199840.40
199940.55
200040.29
200140.69
200240.82
200340.86
200440.82
200540.41
200640.79
200740.88
200838.95
200940.78
201040.79
201140.33
201239.82
201340.42
201440.74
201533.87
201640.63
201740.78
201840.73
201940.65
202040.51
202140.79
202240.80
202340.50
202440.95
202540.77
202637.40

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 Operational adjustments, since July 27, 2026.

The longest run in Operational adjustments on record: 33 days, from June 20, 2001 to July 22, 2001.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
OverflowJanuary 1, 2020January 3, 20203
SafetyJanuary 4, 2020January 5, 20202
OverflowJanuary 6, 2020January 13, 20208
SafetyJanuary 14, 2020January 16, 20203
OverflowJanuary 17, 2020January 17, 20201
SafetyJanuary 18, 2020January 21, 20204
OverflowJanuary 22, 2020January 23, 20202
SafetyJanuary 24, 2020January 24, 20201
OverflowJanuary 25, 2020January 25, 20201
SafetyJanuary 26, 2020January 26, 20201
OverflowJanuary 27, 2020January 27, 20201
SafetyJanuary 28, 2020January 28, 20201
OverflowJanuary 29, 2020January 29, 20201
SafetyJanuary 30, 2020February 7, 20209
OverflowFebruary 8, 2020February 14, 20207
SafetyFebruary 15, 2020February 28, 202014
OverflowFebruary 29, 2020March 1, 20202
SafetyMarch 2, 2020March 19, 202018
OverflowMarch 20, 2020March 20, 20201
SafetyMarch 21, 2020March 24, 20204
OverflowMarch 25, 2020March 25, 20201
SafetyMarch 26, 2020May 9, 202045
ObservationMay 10, 2020May 13, 20204
SafetyMay 14, 2020May 15, 20202
ObservationMay 16, 2020June 15, 202031
Operational adjustmentsJune 16, 2020July 2, 202017
ControlJuly 3, 2020July 12, 202010
Operational adjustmentsJuly 13, 2020July 24, 202012
ObservationJuly 25, 2020July 30, 20206
SafetyJuly 31, 2020July 31, 20201
OverflowAugust 1, 2020August 1, 20201
SafetyAugust 2, 2020September 29, 202056
OverflowSeptember 30, 2020September 30, 20201
SafetyOctober 1, 2020October 6, 20206
OverflowOctober 7, 2020October 7, 20201
SafetyOctober 8, 2020October 9, 20202
OverflowOctober 10, 2020October 10, 20201
SafetyOctober 11, 2020October 19, 20209
OverflowOctober 20, 2020October 20, 20201
SafetyOctober 21, 2020October 22, 20202
OverflowOctober 23, 2020October 24, 20202
SafetyOctober 25, 2020October 25, 20201
OverflowOctober 26, 2020October 27, 20202
SafetyOctober 28, 2020October 30, 20203
OverflowOctober 31, 2020November 2, 20203
SafetyNovember 3, 2020November 5, 20203
OverflowNovember 6, 2020November 6, 20201
SafetyNovember 7, 2020November 16, 202010
OverflowNovember 17, 2020November 17, 20201
SafetyNovember 18, 2020November 19, 20202
OverflowNovember 20, 2020November 21, 20202
SafetyNovember 22, 2020November 25, 20204
OverflowNovember 26, 2020November 26, 20201
SafetyNovember 27, 2020December 9, 202013
OverflowDecember 10, 2020December 10, 20201
SafetyDecember 11, 2020December 12, 20202
OverflowDecember 13, 2020December 13, 20201
SafetyDecember 14, 2020December 16, 20203
OverflowDecember 17, 2020December 17, 20201
SafetyDecember 18, 2020December 19, 20202
OverflowDecember 20, 2020December 20, 20201
SafetyDecember 21, 2020December 27, 20207
OverflowDecember 28, 2020December 28, 20201
SafetyDecember 29, 2020December 29, 20201
OverflowDecember 30, 2020December 30, 20201
SafetyDecember 31, 2020December 31, 20201
OverflowJanuary 1, 2021January 1, 20211
SafetyJanuary 2, 2021January 6, 20215
OverflowJanuary 7, 2021January 26, 202120
SafetyJanuary 27, 2021January 30, 20214
OverflowJanuary 31, 2021February 10, 202111
SafetyFebruary 11, 2021February 12, 20212
OverflowFebruary 13, 2021February 23, 202111
SafetyFebruary 24, 2021March 1, 20216
OverflowMarch 2, 2021March 3, 20212
SafetyMarch 4, 2021June 9, 202198
OverflowJune 10, 2021June 10, 20211
SafetyJune 11, 2021June 11, 20211
OverflowJune 12, 2021June 16, 20215
SafetyJune 17, 2021June 17, 20211
OverflowJune 18, 2021June 18, 20211
SafetyJune 19, 2021June 20, 20212
OverflowJune 21, 2021June 21, 20211
SafetyJune 22, 2021June 26, 20215
OverflowJune 27, 2021June 27, 20211
SafetyJune 28, 2021June 30, 20213
OverflowJuly 1, 2021July 1, 20211
SafetyJuly 2, 2021July 7, 20216
OverflowJuly 8, 2021July 9, 20212
SafetyJuly 10, 2021July 27, 202118
OverflowJuly 28, 2021July 31, 20214
SafetyAugust 1, 2021September 16, 202147
OverflowSeptember 17, 2021September 18, 20212
SafetySeptember 19, 2021September 20, 20212
OverflowSeptember 21, 2021September 21, 20211
SafetySeptember 22, 2021September 22, 20211
OverflowSeptember 23, 2021September 29, 20217
SafetySeptember 30, 2021October 1, 20212
OverflowOctober 2, 2021October 2, 20211
SafetyOctober 3, 2021October 3, 20211
OverflowOctober 4, 2021October 5, 20212
SafetyOctober 6, 2021October 19, 202114
OverflowOctober 20, 2021October 20, 20211
SafetyOctober 21, 2021October 23, 20213
OverflowOctober 24, 2021October 24, 20211
SafetyOctober 25, 2021October 27, 20213
OverflowOctober 28, 2021November 1, 20215
SafetyNovember 2, 2021November 5, 20214
OverflowNovember 6, 2021November 6, 20211
SafetyNovember 7, 2021November 17, 202111
OverflowNovember 18, 2021November 18, 20211
SafetyNovember 19, 2021November 23, 20215
OverflowNovember 24, 2021November 25, 20212
SafetyNovember 26, 2021November 30, 20215
OverflowDecember 1, 2021December 1, 20211
SafetyJanuary 19, 2022February 5, 202218
OverflowFebruary 6, 2022February 7, 20222
SafetyFebruary 8, 2022February 8, 20221
OverflowFebruary 9, 2022February 10, 20222
SafetyFebruary 11, 2022February 11, 20221
OverflowFebruary 12, 2022February 13, 20222
SafetyFebruary 14, 2022February 14, 20221
OverflowFebruary 15, 2022February 16, 20222
SafetyFebruary 17, 2022February 18, 20222
OverflowFebruary 19, 2022February 20, 20222
SafetyFebruary 21, 2022February 21, 20221
OverflowFebruary 22, 2022February 23, 20222
SafetyFebruary 24, 2022March 1, 20226
OverflowMarch 2, 2022March 3, 20222
SafetyMarch 4, 2022March 5, 20222
OverflowMarch 6, 2022March 10, 20225
SafetyMarch 11, 2022March 11, 20221
OverflowMarch 12, 2022March 13, 20222
SafetyMarch 14, 2022June 6, 202285
ObservationJune 7, 2022July 2, 202226
SafetyJuly 3, 2022July 3, 20221
OverflowJuly 4, 2022July 5, 20222
SafetyJuly 6, 2022July 25, 202220
OverflowJuly 26, 2022July 26, 20221
SafetyJuly 27, 2022August 25, 202230
OverflowAugust 26, 2022August 26, 20221
SafetyAugust 27, 2022August 31, 20225
OverflowSeptember 1, 2022September 1, 20221
SafetySeptember 2, 2022September 11, 202210
OverflowSeptember 12, 2022September 12, 20221
SafetySeptember 13, 2022September 17, 20225
ObservationSeptember 18, 2022September 19, 20222
SafetySeptember 20, 2022November 1, 202243
OverflowNovember 2, 2022November 2, 20221
SafetyNovember 3, 2022November 25, 202223
OverflowNovember 26, 2022November 26, 20221
SafetyNovember 27, 2022November 29, 20223
OverflowNovember 30, 2022November 30, 20221
SafetyDecember 1, 2022December 14, 202214
OverflowDecember 15, 2022December 15, 20221
SafetyDecember 16, 2022December 18, 20223
OverflowDecember 19, 2022December 19, 20221
SafetyDecember 20, 2022December 26, 20227
OverflowDecember 27, 2022December 27, 20221
SafetyDecember 28, 2022April 13, 2023107
OverflowApril 14, 2023April 15, 20232
SafetyApril 16, 2023December 16, 2023243
OverflowDecember 17, 2023December 17, 20231
SafetyDecember 18, 2023December 23, 20236
OverflowDecember 24, 2023December 24, 20231
SafetyDecember 25, 2023February 8, 202446
OverflowFebruary 9, 2024February 17, 20249
SafetyFebruary 18, 2024March 25, 202437
OverflowMarch 26, 2024March 29, 20244
SafetyMarch 30, 2024April 20, 202422
OverflowApril 21, 2024April 21, 20241
SafetyApril 22, 2024April 26, 20245
OverflowApril 27, 2024April 28, 20242
SafetyApril 29, 2024May 14, 202416
OverflowMay 15, 2024May 21, 20247
SafetyMay 22, 2024May 24, 20243
OverflowMay 25, 2024May 25, 20241
SafetyMay 26, 2024May 30, 20245
OverflowMay 31, 2024May 31, 20241
SafetyJune 1, 2024June 7, 20247
OverflowJune 8, 2024June 10, 20243
SafetyJune 11, 2024June 12, 20242
OverflowJune 13, 2024June 13, 20241
SafetyJune 14, 2024June 15, 20242
OverflowJune 16, 2024June 16, 20241
SafetyJune 17, 2024July 7, 202421
OverflowJuly 8, 2024July 8, 20241
SafetyJuly 9, 2024July 10, 20242
OverflowJuly 11, 2024July 11, 20241
SafetyJuly 12, 2024July 17, 20246
OverflowJuly 18, 2024July 18, 20241
SafetyJuly 19, 2024July 29, 202411
OverflowJuly 30, 2024July 30, 20241
SafetyJuly 31, 2024August 4, 20245
OverflowAugust 5, 2024August 5, 20241
SafetyAugust 6, 2024August 26, 202421
OverflowAugust 27, 2024August 27, 20241
SafetyAugust 28, 2024September 1, 20245
OverflowSeptember 2, 2024September 2, 20241
SafetySeptember 3, 2024September 12, 202410
OverflowSeptember 13, 2024September 13, 20241
SafetySeptember 14, 2024September 27, 202414
OverflowSeptember 28, 2024September 28, 20241
SafetySeptember 29, 2024November 3, 202436
OverflowNovember 4, 2024November 4, 20241
SafetyNovember 5, 2024December 10, 202436
OverflowDecember 11, 2024December 11, 20241
SafetyDecember 12, 2024December 14, 20243
OverflowDecember 15, 2024December 16, 20242
SafetyDecember 17, 2024December 17, 20241
OverflowDecember 18, 2024December 18, 20241
SafetyDecember 19, 2024December 24, 20246
OverflowDecember 25, 2024December 25, 20241
SafetyDecember 26, 2024December 26, 20241
OverflowDecember 27, 2024December 29, 20243
SafetyDecember 30, 2024January 4, 20256
OverflowJanuary 5, 2025January 5, 20251
SafetyJanuary 6, 2025January 7, 20252
OverflowJanuary 8, 2025January 9, 20252
SafetyJanuary 10, 2025January 11, 20252
OverflowJanuary 12, 2025January 20, 20259
SafetyJanuary 21, 2025January 24, 20254
OverflowJanuary 25, 2025January 25, 20251
SafetyJanuary 26, 2025January 27, 20252
OverflowJanuary 28, 2025January 30, 20253
SafetyJanuary 31, 2025February 3, 20254
OverflowFebruary 4, 2025February 5, 20252
SafetyFebruary 6, 2025February 8, 20253
OverflowFebruary 9, 2025February 9, 20251
SafetyFebruary 10, 2025February 13, 20254
OverflowFebruary 14, 2025February 14, 20251
SafetyFebruary 15, 2025February 25, 202511
OverflowFebruary 26, 2025February 26, 20251
SafetyFebruary 27, 2025March 3, 20255
OverflowMarch 4, 2025March 5, 20252
SafetyMarch 6, 2025March 16, 202511
OverflowMarch 17, 2025March 18, 20252
SafetyMarch 19, 2025March 25, 20257
OverflowMarch 26, 2025March 26, 20251
SafetyMarch 27, 2025April 8, 202513
OverflowApril 9, 2025April 9, 20251
SafetyApril 10, 2025April 12, 20253
OverflowApril 13, 2025April 13, 20251
SafetyApril 14, 2025April 21, 20258
OverflowApril 22, 2025April 22, 20251
SafetyApril 23, 2025May 24, 202532
OverflowMay 25, 2025May 25, 20251
SafetyMay 26, 2025May 28, 20253
OverflowMay 29, 2025June 28, 202531
SafetyJune 29, 2025July 2, 20254
OverflowJuly 3, 2025July 7, 20255
SafetyJuly 8, 2025July 8, 20251
OverflowJuly 9, 2025July 11, 20253
SafetyJuly 12, 2025July 19, 20257
OverflowJuly 21, 2025July 30, 202510
SafetyJuly 31, 2025August 2, 20253
OverflowAugust 3, 2025August 15, 202513
SafetyAugust 16, 2025September 8, 202524
OverflowSeptember 9, 2025September 9, 20251
SafetySeptember 10, 2025September 10, 20251
OverflowSeptember 11, 2025September 11, 20251
SafetySeptember 12, 2025September 13, 20252
OverflowSeptember 14, 2025September 15, 20252
SafetySeptember 16, 2025September 22, 20257
OverflowSeptember 23, 2025September 24, 20252
SafetySeptember 25, 2025September 26, 20252
OverflowSeptember 27, 2025September 27, 20251
SafetySeptember 28, 2025October 31, 202534
OverflowNovember 1, 2025November 1, 20251
SafetyNovember 2, 2025November 8, 20257
OverflowNovember 9, 2025November 10, 20252
SafetyNovember 11, 2025November 13, 20253
OverflowNovember 14, 2025November 14, 20251
SafetyNovember 15, 2025November 19, 20255
OverflowNovember 20, 2025December 2, 202513
SafetyDecember 3, 2025December 3, 20251
OverflowDecember 4, 2025December 8, 20255
SafetyDecember 9, 2025December 10, 20252
OverflowDecember 11, 2025December 31, 202521
SafetyJanuary 1, 2026January 1, 20261
OverflowJanuary 2, 2026January 2, 20261
SafetyJanuary 3, 2026January 5, 20263
OverflowJanuary 6, 2026January 12, 20267
SafetyJanuary 13, 2026January 15, 20263
OverflowJanuary 16, 2026January 17, 20262
SafetyJanuary 18, 2026January 22, 20265
OverflowJanuary 23, 2026February 13, 202622
SafetyFebruary 14, 2026February 14, 20261
OverflowFebruary 15, 2026March 2, 202616
SafetyMarch 3, 2026March 3, 20261
OverflowMarch 4, 2026March 12, 20269
SafetyMarch 13, 2026March 13, 20261
OverflowMarch 14, 2026March 20, 20267
SafetyMarch 21, 2026March 22, 20262
OverflowMarch 23, 2026March 27, 20265
SafetyMarch 28, 2026March 28, 20261
OverflowMarch 29, 2026April 12, 202615
SafetyApril 13, 2026April 13, 20261
OverflowApril 14, 2026April 14, 20261
SafetyApril 15, 2026April 16, 20262
OverflowApril 17, 2026April 18, 20262
SafetyApril 19, 2026April 20, 20262
OverflowApril 21, 2026April 29, 20269
SafetyApril 30, 2026May 12, 202613
OverflowMay 13, 2026May 29, 202617
SafetyMay 30, 2026July 2, 202634
ObservationJuly 3, 2026July 26, 202624
Operational adjustmentsJuly 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.