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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Lucchetti

Yauco

Safety

171.54m

562.79 ft

0.85 m above Observation

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

Compared with normal

2.16 m above normal for this date

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

Percentile 87 across 36 years of record.

Rank 446 of 514 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
169.38 m
Minimum
156.88 m1994
Maximum
173.85 m2024
90th percentile
171.84 m

Level over time

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

Lucchetti: level from July 25, 2026 to August 23, 2026, a net fall of 0.95 m.

August 23, 2026: 171.54 m.

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

From July 25, 2026 to August 23, 2026. Minimum 170.53 m, maximum 172.49 m.

The vertical scale runs from 170.50 m to 172.50 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.

Lucchetti: level from July 25, 2026 to August 23, 2026, a net fall of 0.95 m.
Datem
July 25, 2026172.49
July 26, 2026172.34
July 27, 2026172.33
July 28, 2026172.18
July 29, 2026172.07
July 30, 2026172.00
July 31, 2026171.89
August 1, 2026171.80
August 2, 2026171.79
August 3, 2026171.79
August 4, 2026171.59
August 5, 2026171.48
August 6, 2026171.48
August 7, 2026171.33
August 8, 2026171.24
August 9, 2026171.15
August 10, 2026171.15
August 11, 2026171.00
August 12, 2026170.94
August 13, 2026170.88
August 14, 2026170.78
August 15, 2026170.67
August 16, 2026170.60
August 17, 2026170.53
August 18, 2026170.76
August 19, 2026171.07
August 20, 2026171.37
August 21, 2026171.63
August 22, 2026171.62
August 23, 2026171.54

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.

30 years of the 36 with a reading on August 23 were below the most recent level.

From 1990 to 2026.

The dashed line is this reservoir’s most recent level: 171.54 m on August 23, 2026.

The vertical scale runs from 160.00 m to 175.00 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.

30 years of the 36 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1990163.42
1991161.04
1992168.99
1993165.41
1995168.39
1996170.92
1997161.18
1998172.32
1999164.35
2000172.19
2001165.78
2002164.72
2003161.70
2004167.34
2005166.86
2006168.36
2007168.37
2008167.75
2009171.02
2010169.40
2011168.32
2012170.29
2013169.73
2014169.99
2015171.50
2016170.33
2017170.21
2018170.70
2019170.85
2020171.71
2021168.14
2022171.39
2023170.90
2024172.54
2025172.33
2026171.54

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

6 days in Safety, since August 18, 2026.

The longest run in Safety on record: 397 days, from July 14, 2025 to August 14, 2026.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020January 10, 202010
ObservationJanuary 11, 2020January 16, 20206
Operational adjustmentsJanuary 18, 2020January 22, 20203
ObservationJanuary 23, 2020March 1, 202039
SafetyMarch 2, 2020March 14, 202013
ObservationMarch 15, 2020April 25, 202042
SafetyApril 26, 2020May 2, 20207
ObservationMay 3, 2020June 7, 202036
SafetyJune 8, 2020June 12, 20205
ObservationJune 13, 2020July 6, 202024
SafetyJuly 7, 2020July 15, 20209
ObservationJuly 16, 2020July 30, 202015
SafetyJuly 31, 2020August 1, 20202
OverflowAugust 2, 2020August 10, 20209
SafetyAugust 11, 2020August 27, 202017
ObservationAugust 28, 2020September 12, 202016
SafetySeptember 13, 2020September 19, 20207
ObservationSeptember 20, 2020September 27, 20208
SafetySeptember 28, 2020October 22, 202025
ObservationOctober 23, 2020November 4, 202013
SafetyNovember 5, 2020December 3, 202029
ObservationDecember 4, 2020December 12, 20209
SafetyDecember 13, 2020January 4, 202123
ObservationJanuary 5, 2021January 21, 202117
SafetyJanuary 22, 2021January 25, 20214
ObservationJanuary 26, 2021February 6, 202112
SafetyFebruary 7, 2021February 15, 20219
ObservationFebruary 16, 2021February 23, 20218
SafetyFebruary 24, 2021February 24, 20211
ObservationFebruary 25, 2021April 14, 202149
Operational adjustmentsApril 15, 2021April 16, 20212
ObservationApril 17, 2021April 20, 20214
Operational adjustmentsApril 21, 2021April 25, 20215
ObservationApril 26, 2021May 20, 202125
Operational adjustmentsMay 21, 2021May 21, 20211
ObservationMay 22, 2021June 9, 202119
SafetyJune 10, 2021June 16, 20217
ObservationJune 17, 2021June 24, 20218
SafetyJune 25, 2021July 1, 20217
ObservationJuly 2, 2021July 10, 20219
SafetyJuly 11, 2021July 18, 20218
ObservationJuly 19, 2021July 30, 202112
SafetyJuly 31, 2021August 4, 20215
ObservationAugust 5, 2021August 12, 20218
Operational adjustmentsAugust 13, 2021September 13, 202132
ObservationSeptember 14, 2021September 21, 20218
SafetySeptember 22, 2021September 23, 20212
ObservationSeptember 24, 2021October 8, 202115
SafetyOctober 9, 2021October 19, 202111
OverflowOctober 20, 2021October 20, 20211
SafetyOctober 21, 2021November 18, 202129
ObservationNovember 19, 2021November 29, 202111
SafetyNovember 30, 2021December 21, 202122
ObservationDecember 22, 2021January 1, 202211
SafetyJanuary 2, 2022January 17, 202216
ObservationJanuary 18, 2022January 27, 202210
Operational adjustmentsJanuary 28, 2022February 5, 20229
ObservationFebruary 6, 2022February 12, 20227
SafetyFebruary 13, 2022February 16, 20224
ObservationFebruary 17, 2022July 17, 202237
SafetyJuly 18, 2022July 18, 20221
ObservationJuly 19, 2022August 9, 202222
Operational adjustmentsAugust 10, 2022August 11, 20222
ObservationAugust 12, 2022August 17, 20226
SafetyAugust 18, 2022August 30, 202213
ObservationAugust 31, 2022September 1, 20222
SafetySeptember 2, 2022September 2, 20221
ObservationSeptember 3, 2022September 11, 20229
SafetySeptember 12, 2022September 15, 20224
ObservationSeptember 16, 2022September 18, 20223
OverflowSeptember 19, 2022September 26, 20228
SafetySeptember 27, 2022October 5, 20229
ObservationOctober 6, 2022October 8, 20223
SafetyOctober 9, 2022November 2, 202225
OverflowNovember 3, 2022November 7, 20225
SafetyNovember 8, 2022November 27, 202220
OverflowNovember 28, 2022November 28, 20221
SafetyNovember 29, 2022June 8, 2023192
ObservationJune 9, 2023June 10, 20232
SafetyJune 11, 2023October 7, 2023116
ObservationOctober 8, 2023October 13, 20236
SafetyOctober 14, 2023December 18, 202366
ObservationDecember 19, 2023December 25, 20237
SafetyDecember 26, 2023December 27, 20232
ObservationDecember 28, 2023December 29, 20232
SafetyDecember 30, 2023January 8, 202410
ObservationJanuary 9, 2024January 23, 202415
SafetyJanuary 24, 2024March 1, 202438
ObservationMarch 2, 2024March 4, 20243
SafetyMarch 5, 2024April 2, 202429
ObservationApril 3, 2024April 5, 20243
SafetyApril 6, 2024May 7, 202432
OverflowMay 8, 2024May 13, 20246
SafetyMay 14, 2024August 14, 202493
OverflowAugust 15, 2024August 16, 20242
SafetyAugust 17, 2024September 13, 202427
ObservationSeptember 14, 2024September 16, 20243
SafetySeptember 17, 2024October 24, 202438
ObservationOctober 25, 2024October 27, 20243
SafetyOctober 28, 2024February 3, 202599
ObservationFebruary 4, 2025February 4, 20251
SafetyFebruary 5, 2025May 2, 202587
OverflowMay 3, 2025May 3, 20251
SafetyMay 4, 2025May 9, 20256
ObservationMay 10, 2025May 12, 20253
SafetyMay 13, 2025June 18, 202537
ObservationJune 19, 2025June 20, 20252
SafetyJune 21, 2025July 10, 202520
ObservationJuly 11, 2025July 13, 20253
SafetyJuly 14, 2025August 14, 2026397
ObservationAugust 15, 2026August 17, 20263
SafetyAugust 18, 2026August 23, 20266

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.