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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Dos Bocas

Arecibo

Safety

88.43m

290.14 ft

0.34 m above Observation

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

Compared with normal

0.84 m below normal for this date

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

Percentile 11 across 27 years of record.

Rank 44 of 390 readings from these dates. Rank 1 is the lowest.

The rank counts individual readings, not years.

Most recent year lower on this date: 2023.

Median
89.28 m
Minimum
86.54 m2000
Maximum
90.92 m2014
90th percentile
89.95 m

Level over time

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

Dos Bocas: level from July 25, 2026 to August 23, 2026, a net fall of 0.72 m.

August 23, 2026: 88.43 m.

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

From July 25, 2026 to August 23, 2026. Minimum 88.43 m, maximum 89.60 m.

The vertical scale runs from 88.00 m to 90.00 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 Safety.

3 bounds fall outside this chart’s scale.

Dos Bocas: level from July 25, 2026 to August 23, 2026, a net fall of 0.72 m.
Datem
July 25, 202689.16
July 26, 202689.07
July 27, 202689.03
July 28, 202689.00
July 29, 202689.03
July 30, 202689.03
July 31, 202688.92
August 1, 202688.83
August 2, 202688.82
August 3, 202688.80
August 4, 202688.64
August 5, 202688.54
August 6, 202689.26
August 7, 202689.57
August 8, 202689.60
August 9, 202689.50
August 10, 202689.42
August 11, 202689.33
August 12, 202689.29
August 13, 202689.44
August 14, 202689.46
August 15, 202689.39
August 16, 202689.16
August 17, 202689.03
August 18, 202688.94
August 19, 202688.80
August 20, 202688.74
August 21, 202688.65
August 22, 202688.55
August 23, 202688.43

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.

3 years of the 26 with a reading on August 23 were below the most recent level.

From 1999 to 2026.

The dashed line is this reservoir’s most recent level: 88.43 m on August 23, 2026.

The vertical scale runs from 86.00 m to 92.00 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.

3 years of the 26 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
199989.23
200188.76
200288.86
200388.43
200489.30
200589.45
200689.19
200789.43
200889.04
200988.82
201089.01
201190.90
201288.19
201488.63
201589.59
201689.46
201789.47
201889.86
201989.43
202089.77
202187.47
202289.68
202389.06
202489.31
202590.17
202688.43

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

84 days in Safety, since June 1, 2026.

The longest run in Safety on record: 199 days, from May 7, 2007 to December 9, 2007.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020January 11, 202011
ObservationJanuary 12, 2020January 12, 20201
SafetyJanuary 13, 2020January 13, 20201
OverflowJanuary 14, 2020January 14, 20201
SafetyJanuary 15, 2020January 29, 202015
OverflowJanuary 30, 2020March 16, 202047
SafetyMarch 17, 2020March 17, 20201
OverflowMarch 18, 2020March 18, 20201
SafetyMarch 19, 2020March 19, 20201
OverflowMarch 20, 2020March 23, 20204
SafetyMarch 24, 2020March 24, 20201
OverflowMarch 25, 2020March 25, 20201
SafetyMarch 26, 2020March 27, 20202
OverflowMarch 28, 2020March 28, 20201
SafetyMarch 29, 2020April 6, 20209
OverflowApril 7, 2020April 7, 20201
SafetyApril 8, 2020May 23, 202046
OverflowMay 24, 2020May 24, 20201
SafetyMay 25, 2020May 27, 20203
OverflowMay 28, 2020May 28, 20201
SafetyMay 29, 2020June 7, 202010
OverflowJune 8, 2020June 8, 20201
SafetyJune 9, 2020June 9, 20201
OverflowJune 10, 2020June 11, 20202
SafetyJune 12, 2020June 12, 20201
OverflowJune 13, 2020June 14, 20202
SafetyJune 15, 2020July 12, 202028
OverflowJuly 13, 2020July 13, 20201
SafetyJuly 14, 2020July 19, 20206
OverflowJuly 20, 2020July 23, 20204
SafetyJuly 24, 2020July 30, 20207
OverflowJuly 31, 2020August 1, 20202
SafetyAugust 2, 2020August 2, 20201
OverflowAugust 3, 2020August 3, 20201
SafetyAugust 4, 2020August 20, 202017
OverflowAugust 21, 2020August 21, 20201
SafetyAugust 22, 2020September 11, 202021
OverflowSeptember 12, 2020September 13, 20202
SafetySeptember 14, 2020September 15, 20202
OverflowSeptember 16, 2020September 17, 20202
SafetySeptember 18, 2020October 6, 202019
OverflowOctober 7, 2020October 7, 20201
SafetyOctober 8, 2020October 18, 202011
OverflowOctober 19, 2020October 19, 20201
SafetyOctober 20, 2020October 21, 20202
OverflowOctober 22, 2020October 22, 20201
SafetyOctober 23, 2020November 11, 202020
OverflowNovember 12, 2020November 12, 20201
SafetyNovember 13, 2020December 26, 202044
OverflowDecember 27, 2020December 30, 20204
SafetyDecember 31, 2020April 6, 202197
OverflowApril 7, 2021April 7, 20211
SafetyApril 8, 2021May 1, 202124
OverflowMay 2, 2021May 2, 20211
SafetyMay 3, 2021May 5, 20213
OverflowMay 6, 2021May 6, 20211
SafetyMay 7, 2021May 21, 202115
OverflowMay 22, 2021May 22, 20211
SafetyMay 23, 2021May 28, 20216
OverflowMay 29, 2021May 29, 20211
SafetyMay 30, 2021August 22, 202185
ObservationAugust 23, 2021August 24, 20212
SafetyAugust 25, 2021September 8, 202115
OverflowSeptember 9, 2021September 9, 20211
SafetySeptember 10, 2021September 12, 20213
OverflowSeptember 13, 2021October 4, 202122
SafetyOctober 5, 2021October 7, 20213
OverflowOctober 8, 2021October 8, 20211
SafetyOctober 9, 2021October 12, 20214
OverflowOctober 13, 2021October 14, 20212
SafetyOctober 15, 2021October 15, 20211
OverflowOctober 16, 2021October 25, 202110
SafetyOctober 26, 2021October 28, 20213
OverflowOctober 29, 2021October 30, 20212
SafetyOctober 31, 2021November 5, 20216
OverflowNovember 6, 2021November 6, 20211
SafetyNovember 7, 2021February 4, 202290
OverflowFebruary 5, 2022February 5, 20221
SafetyFebruary 6, 2022April 7, 202261
ObservationApril 8, 2022April 10, 20223
SafetyApril 11, 2022April 26, 202216
ObservationApril 27, 2022April 27, 20221
SafetyApril 28, 2022May 18, 202221
ObservationMay 19, 2022May 19, 20221
SafetyMay 20, 2022May 27, 20228
OverflowMay 28, 2022May 28, 20221
SafetyMay 29, 2022July 26, 202259
ObservationJuly 27, 2022July 27, 20221
SafetyJuly 28, 2022August 26, 202230
OverflowAugust 27, 2022September 1, 20226
SafetySeptember 2, 2022September 6, 20225
OverflowSeptember 7, 2022September 7, 20221
SafetySeptember 8, 2022September 11, 20224
OverflowSeptember 12, 2022September 13, 20222
SafetySeptember 14, 2022September 18, 20225
OverflowSeptember 19, 2022September 25, 20227
SafetySeptember 26, 2022September 26, 20221
OverflowSeptember 27, 2022November 25, 202260
SafetyNovember 26, 2022November 28, 20223
OverflowNovember 29, 2022December 12, 202214
SafetyDecember 13, 2022January 8, 202327
OverflowJanuary 9, 2023January 9, 20231
SafetyJanuary 10, 2023January 11, 20232
OverflowJanuary 12, 2023January 13, 20232
SafetyJanuary 14, 2023January 15, 20232
OverflowJanuary 16, 2023January 18, 20233
SafetyJanuary 19, 2023April 28, 2023100
OverflowApril 29, 2023April 29, 20231
SafetyApril 30, 2023May 17, 202318
OverflowMay 18, 2023May 18, 20231
SafetyMay 19, 2023May 21, 20233
OverflowMay 22, 2023May 22, 20231
SafetyMay 23, 2023September 18, 2023119
OverflowSeptember 19, 2023September 23, 20235
SafetySeptember 24, 2023October 27, 202334
OverflowOctober 28, 2023October 29, 20232
SafetyOctober 30, 2023November 7, 20239
OverflowNovember 8, 2023November 11, 20234
SafetyNovember 12, 2023December 22, 202341
OverflowDecember 23, 2023December 23, 20231
SafetyDecember 24, 2023December 24, 20231
OverflowDecember 25, 2023December 25, 20231
SafetyDecember 26, 2023December 28, 20233
OverflowDecember 29, 2023December 29, 20231
SafetyDecember 30, 2023March 20, 202482
OverflowMarch 21, 2024March 21, 20241
SafetyMarch 22, 2024March 25, 20244
OverflowMarch 26, 2024March 26, 20241
SafetyMarch 27, 2024April 8, 202413
OverflowApril 9, 2024April 9, 20241
SafetyApril 10, 2024April 17, 20248
OverflowApril 18, 2024April 25, 20248
SafetyApril 26, 2024April 26, 20241
OverflowApril 27, 2024April 28, 20242
SafetyApril 29, 2024April 29, 20241
OverflowApril 30, 2024April 30, 20241
SafetyMay 1, 2024May 1, 20241
OverflowMay 2, 2024May 2, 20241
SafetyMay 3, 2024May 6, 20244
OverflowMay 7, 2024May 12, 20246
SafetyMay 13, 2024May 13, 20241
OverflowMay 14, 2024May 21, 20248
SafetyMay 22, 2024May 23, 20242
OverflowMay 24, 2024May 24, 20241
SafetyMay 25, 2024May 25, 20241
OverflowMay 26, 2024May 26, 20241
SafetyMay 27, 2024June 2, 20247
OverflowJune 3, 2024June 7, 20245
SafetyJune 8, 2024June 22, 202415
OverflowJune 23, 2024June 24, 20242
SafetyJune 25, 2024June 26, 20242
OverflowJune 27, 2024June 27, 20241
SafetyJune 28, 2024August 14, 202448
OverflowAugust 15, 2024August 22, 20248
SafetyAugust 23, 2024August 26, 20244
OverflowAugust 27, 2024August 28, 20242
SafetyAugust 29, 2024August 31, 20243
OverflowSeptember 1, 2024September 2, 20242
SafetySeptember 3, 2024September 5, 20243
OverflowSeptember 6, 2024October 3, 202428
SafetyOctober 4, 2024October 8, 20245
ObservationOctober 9, 2024October 10, 20242
SafetyOctober 11, 2024October 29, 202419
OverflowOctober 30, 2024October 30, 20241
SafetyOctober 31, 2024November 10, 202411
OverflowNovember 11, 2024November 12, 20242
SafetyNovember 13, 2024November 14, 20242
OverflowNovember 15, 2024November 17, 20243
SafetyNovember 18, 2024December 20, 202433
OverflowDecember 21, 2024December 30, 202410
SafetyDecember 31, 2024December 31, 20241
OverflowJanuary 1, 2025January 1, 20251
SafetyJanuary 2, 2025January 5, 20254
OverflowJanuary 6, 2025January 13, 20258
SafetyJanuary 14, 2025February 4, 202522
OverflowFebruary 5, 2025February 5, 20251
SafetyFebruary 6, 2025February 9, 20254
OverflowFebruary 10, 2025February 10, 20251
SafetyFebruary 11, 2025February 15, 20255
OverflowFebruary 16, 2025February 16, 20251
SafetyFebruary 17, 2025March 4, 202516
OverflowMarch 5, 2025March 6, 20252
SafetyMarch 7, 2025March 13, 20257
OverflowMarch 14, 2025March 15, 20252
SafetyMarch 16, 2025March 16, 20251
OverflowMarch 17, 2025March 17, 20251
SafetyMarch 18, 2025March 30, 202513
OverflowMarch 31, 2025March 31, 20251
SafetyApril 1, 2025April 12, 202512
OverflowApril 13, 2025April 13, 20251
SafetyApril 14, 2025April 19, 20256
OverflowApril 20, 2025April 21, 20252
SafetyApril 22, 2025April 26, 20255
OverflowApril 27, 2025May 10, 202514
SafetyMay 11, 2025May 11, 20251
OverflowMay 12, 2025May 13, 20252
SafetyMay 14, 2025May 16, 20253
OverflowMay 17, 2025May 28, 202512
SafetyMay 29, 2025June 4, 20257
OverflowJune 5, 2025June 11, 20257
SafetyJune 12, 2025June 15, 20254
OverflowJune 16, 2025June 16, 20251
SafetyJune 17, 2025July 28, 202542
OverflowJuly 29, 2025July 29, 20251
SafetyJuly 30, 2025August 8, 202510
OverflowAugust 9, 2025August 9, 20251
SafetyAugust 10, 2025August 10, 20251
OverflowAugust 11, 2025August 14, 20254
SafetyAugust 15, 2025August 17, 20253
OverflowAugust 18, 2025August 25, 20258
SafetyAugust 26, 2025August 26, 20251
OverflowAugust 27, 2025August 27, 20251
SafetyAugust 28, 2025August 30, 20253
OverflowAugust 31, 2025August 31, 20251
SafetySeptember 1, 2025September 5, 20255
OverflowSeptember 6, 2025September 7, 20252
SafetySeptember 8, 2025September 9, 20252
OverflowSeptember 10, 2025October 28, 202549
SafetyOctober 29, 2025October 29, 20251
OverflowOctober 30, 2025October 30, 20251
SafetyOctober 31, 2025November 13, 202514
OverflowNovember 14, 2025November 26, 202513
SafetyNovember 27, 2025November 27, 20251
OverflowNovember 28, 2025December 1, 20254
SafetyDecember 2, 2025December 2, 20251
OverflowDecember 3, 2025December 3, 20251
SafetyDecember 4, 2025December 16, 202513
OverflowDecember 17, 2025December 17, 20251
SafetyDecember 18, 2025December 18, 20251
OverflowDecember 19, 2025December 29, 202511
SafetyDecember 30, 2025January 2, 20264
OverflowJanuary 3, 2026January 7, 20265
SafetyJanuary 8, 2026January 13, 20266
OverflowJanuary 14, 2026January 14, 20261
SafetyJanuary 15, 2026January 30, 202616
OverflowJanuary 31, 2026January 31, 20261
SafetyFebruary 1, 2026February 1, 20261
OverflowFebruary 2, 2026February 9, 20268
SafetyFebruary 10, 2026February 14, 20265
OverflowFebruary 15, 2026February 22, 20268
SafetyFebruary 23, 2026February 27, 20265
OverflowFebruary 28, 2026March 2, 20263
SafetyMarch 3, 2026March 3, 20261
OverflowMarch 4, 2026March 4, 20261
SafetyMarch 5, 2026March 15, 202611
OverflowMarch 16, 2026March 16, 20261
SafetyMarch 17, 2026March 24, 20268
OverflowMarch 25, 2026March 26, 20262
SafetyMarch 27, 2026March 27, 20261
OverflowMarch 28, 2026March 31, 20264
SafetyApril 1, 2026April 1, 20261
OverflowApril 2, 2026April 7, 20266
SafetyApril 8, 2026April 8, 20261
OverflowApril 9, 2026April 9, 20261
SafetyApril 10, 2026April 11, 20262
OverflowApril 12, 2026April 22, 202611
SafetyApril 23, 2026April 28, 20266
OverflowApril 29, 2026May 5, 20267
SafetyMay 6, 2026May 7, 20262
OverflowMay 8, 2026May 9, 20262
SafetyMay 10, 2026May 10, 20261
OverflowMay 11, 2026May 11, 20261
SafetyMay 12, 2026May 14, 20263
OverflowMay 15, 2026May 15, 20261
SafetyMay 16, 2026May 17, 20262
OverflowMay 18, 2026May 18, 20261
SafetyMay 19, 2026May 29, 202611
OverflowMay 30, 2026May 31, 20262
SafetyJune 1, 2026August 23, 202684

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.