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Water Week in Review: Carraízo Up 17 cm, Oct 4–10

Published Oct 11, 2026, 6:05 AM AST787daily · Original analysis

At a glance

  • Carraízo: 40.74 → 40.91 m (+17 cm) over 6 days — Spilling band, 4.07 in of rain nearby in the final week
  • La Plata: 43.79 → 43.52 m (−27 cm) over 6 days — Adjustments band, 2.38 in of rain nearby in the final week
  • Cidra: 400.53 → 400.61 m (+8 cm) over 6 days — Watch band, 4.48 in of rain nearby in the final week
  • Readings of October 4–10: AAA posted a chart on 7 of 7 days

Why this matters: What the week changed is the distance to the next band line — 0.01 m for Carraízo, 3.00 m for La Plata — and the pace at which it is closing or opening.

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The week of October 4–10 on AAA’s reservoir charts: Carraízo up 17 cm, La Plata down 27 cm. The numbers first, then what they add up to.

Where the reservoirs stand

Control Adjustments Ajustes Watch Observación Safe Seguridad Spilling Carraízo, 40.91 m, Safe (Seguridad), +327 cm since Aug 7, +31 cm vs Oct 2 40.91 Carraízo La Plata, 43.52 m, Adjustments (Ajustes), −303 cm since Aug 7, −44 cm vs Oct 2 43.52 La Plata Cidra, 400.61 m, Watch (Observación), +44 cm since Aug 7, +7 cm vs Oct 2 400.61 Cidra Toa Vaca, 147.05 m, Safe (Seguridad), −59 cm since Aug 7, +7 cm vs Oct 2 147.05 Toa Vaca Río Blanco, 27.57 m, Safe (Seguridad), +191 cm since Aug 7, +109 cm vs Oct 2 27.57 Río Blanco Fajardo, 48.19 m, Watch (Observación), +60 cm since Aug 7, +51 cm vs Oct 2 48.19 Fajardo AAA — DRINKING WATER Carite, 542.37 m, Safe (Seguridad), +36 cm since Aug 7, +3 cm vs Oct 2 542.37 Carite Patillas, 65.76 m, Safe (Seguridad), +194 cm since Aug 7, +14 cm vs Oct 2 65.76 Patillas Guineo, 900.77 m, Safe (Seguridad), −165 cm since Aug 7, −81 cm vs Oct 2 900.77 Guineo Matrullas, 733.69 m, Safe (Seguridad), +70 cm since Aug 7, −3 cm vs Oct 2 733.69 Matrullas Guayabal, 103.47 m, Safe (Seguridad), +112 cm since Aug 7, +62 cm vs Oct 2 103.47 Guayabal Garzas, 736.09 m, Spilling (Desborde), +10 cm since Aug 7, ±0 cm vs Oct 2 736.09 Garzas Guayo, 443.29 m, Safe (Seguridad), +50 cm since Aug 7, −11 cm vs Oct 2 443.29 Guayo Lucchetti, 172.14 m, Safe (Seguridad), +81 cm since Aug 7, +122 cm vs Oct 2 172.14 Lucchetti Loco, 69.83 m, Safe (Seguridad), +5 cm since Aug 7, +2 cm vs Oct 2 69.83 Loco Dos Bocas, 89.52 m, Safe (Seguridad), −4 cm since Aug 7, −25 cm vs Oct 2 89.52 Dos Bocas Caonillas, 251.79 m, Safe (Seguridad), +108 cm since Aug 7, −1 cm vs Oct 2 251.79 Caonillas Guajataca, 196.27 m, Safe (Seguridad), +33 cm since Aug 7, +8 cm vs Oct 2 196.27 Guajataca PREPA — HYDROELECTRIC Cerrillos, 166.48 m, Safe (Seguridad), −185 cm since Aug 7, −19 cm vs Oct 2 166.48 Cerrillos DRNA
Week 10 of the metro rotation (the San Juan area's rationing schedule) — where the 19 reservoirs stand as of Oct 10: each column is that reservoir's own ladder of AAA bands, the bar its level in meters, the dashed tick where it stood on August 7, day one of the rotation, the triangle its change from seven days earlier. Source: AAA's 5 AM readings; bands as AAA's monitoring chart defines them.

16 of 19 reservoirs sit in the Safe band (Seguridad) or above, 2 in the Watch band (Observación); La Plata is in the Adjustments band (Ajustes). Since August 7, Carraízo (Adjustments → Safe), Cidra (Adjustments → Watch), Río Blanco (Watch → Safe), Matrullas (Watch → Safe), Guayabal (Watch → Safe), Garzas (Safe → Spilling) have moved up a band; La Plata (Watch → Adjustments), Guineo (Spilling → Safe) have slipped down. The biggest move since Oct 2 is Lucchetti, up 122 cm to 172.14 m.

Reservoir by reservoir

Carraízo

Oct 4 → Oct 10
40.74 → 40.91 mSpilling band today
Net change
+17 cm2.8 cm a day on average
Best morning
+23 cmOct 8
Worst morning
−4 cmOct 7
Rain nearby, last 7 days
4.07 inmost on Oct 10 (2.73 in)
Above the Safe line
0.01 mholding

La Plata

Oct 4 → Oct 10
43.79 → 43.52 mAdjustments band today
Net change
−27 cm4.5 cm a day on average
Worst morning
−8 cmOct 5
Rain nearby, last 7 days
2.38 inmost on Oct 10 (0.92 in)
Above the Control line
3.00 mmore than two months at this week's pace

Cidra

Oct 4 → Oct 10
400.53 → 400.61 mWatch band today
Net change
+8 cm1.3 cm a day on average
Best morning
+6 cmOct 8
Rain nearby, last 7 days
4.48 inmost on Oct 7 (1.61 in)
Above the Adjustments line
0.42 mrising — Safe line more than two months up

Carraízo, this week

Carraízo, morning by morning — tap a day for that day's Daily Water Watch

Teal = up from the previous reading, coral = down; a bold border marks a move of 20 cm or more. A day with no chart is grey, and the next day's move covers both.

Three reservoirs, one scale

0 +20 cm −27 cm Oct 4 Oct 10 Carraízo, Oct 4, 40.74 m, ±0 cm since Oct 4Carraízo, Oct 4, 40.74 m, ±0 cm since Oct 4Carraízo, Oct 5, 40.72 m, −2 cm since Oct 4Carraízo, Oct 5, 40.72 m, −2 cm since Oct 4Carraízo, Oct 6, 40.69 m, −5 cm since Oct 4Carraízo, Oct 6, 40.69 m, −5 cm since Oct 4Carraízo, Oct 7, 40.65 m, −9 cm since Oct 4Carraízo, Oct 7, 40.65 m, −9 cm since Oct 4Carraízo, Oct 8, 40.88 m, +14 cm since Oct 4Carraízo, Oct 8, 40.88 m, +14 cm since Oct 4Carraízo, Oct 9, 40.94 m, +20 cm since Oct 4Carraízo, Oct 9, 40.94 m, +20 cm since Oct 4Carraízo, Oct 10, 40.91 m, +17 cm since Oct 4Carraízo, Oct 10, 40.91 m, +17 cm since Oct 4Carraízo +17 cm La Plata, Oct 4, 43.79 m, ±0 cm since Oct 4La Plata, Oct 4, 43.79 m, ±0 cm since Oct 4La Plata, Oct 5, 43.71 m, −8 cm since Oct 4La Plata, Oct 5, 43.71 m, −8 cm since Oct 4La Plata, Oct 6, 43.70 m, −9 cm since Oct 4La Plata, Oct 6, 43.70 m, −9 cm since Oct 4La Plata, Oct 7, 43.68 m, −11 cm since Oct 4La Plata, Oct 7, 43.68 m, −11 cm since Oct 4La Plata, Oct 8, 43.62 m, −17 cm since Oct 4La Plata, Oct 8, 43.62 m, −17 cm since Oct 4La Plata, Oct 9, 43.54 m, −25 cm since Oct 4La Plata, Oct 9, 43.54 m, −25 cm since Oct 4La Plata, Oct 10, 43.52 m, −27 cm since Oct 4La Plata, Oct 10, 43.52 m, −27 cm since Oct 4La Plata −27 cm Cidra, Oct 4, 400.53 m, ±0 cm since Oct 4Cidra, Oct 4, 400.53 m, ±0 cm since Oct 4Cidra, Oct 5, 400.54 m, +1 cm since Oct 4Cidra, Oct 5, 400.54 m, +1 cm since Oct 4Cidra, Oct 6, 400.54 m, +1 cm since Oct 4Cidra, Oct 6, 400.54 m, +1 cm since Oct 4Cidra, Oct 7, 400.54 m, +1 cm since Oct 4Cidra, Oct 7, 400.54 m, +1 cm since Oct 4Cidra, Oct 8, 400.60 m, +7 cm since Oct 4Cidra, Oct 8, 400.60 m, +7 cm since Oct 4Cidra, Oct 9, 400.61 m, +8 cm since Oct 4Cidra, Oct 9, 400.61 m, +8 cm since Oct 4Cidra, Oct 10, 400.61 m, +8 cm since Oct 4Cidra, Oct 10, 400.61 m, +8 cm since Oct 4Cidra +8 cm
Change since Oct 4, in centimeters — three reservoirs on one scale. Hover or tap a point for the day's reading. Data: AAA Monitoreo Diario.

What it adds up to

The week’s one real change was Carraízo’s jump of 23 cm on October 8, the morning after 0.8 in of rain. That single gain put the reservoir in the Spilling band (Desborde), its fullest, and it now sits just 0.01 m above the Safe line (Seguridad), so a few dry mornings could push it back down. Cidra also rose, but only in small steps, and it remains in observación, 0.42 m above the Adjustments line (Ajustes).

The rain did not rescue La Plata. It fell on the day-to-day readings there too, but the reservoir dropped on all six mornings and has fallen 18 days running, though the slide is slowing. It sits in ajustes, 3.00 m above the Control line. At the latest weekly pace, that line is more than two months away. That is arithmetic, not a forecast. Cidra’s climb into seguridad is likewise more than two months out at its current rate.

Each reservoir against its own next band line
Adjustments Watch Safe 37.0 37.5 38.0 38.5 39.0 39.5 40.0 40.5 41.0 Oct 4 Oct 7 Oct 10 Oct 4, 40.74 m, SafeOct 5, 40.72 m, −2 cm, SafeOct 6, 40.69 m, −3 cm, SafeOct 7, 40.65 m, −4 cm, SafeOct 8, 40.88 m, +23 cm, SafeOct 9, 40.94 m, +6 cm, SafeOct 10, 40.91 m, −3 cm, Safe 40.91 m
Carraízo since Oct 4, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 4, 40.74 m, Safe
  • Oct 5, 40.72 m, −2 cm, Safe
  • Oct 6, 40.69 m, −3 cm, Safe
  • Oct 7, 40.65 m, −4 cm, Safe
  • Oct 8, 40.88 m, +23 cm, Safe
  • Oct 9, 40.94 m, +6 cm, Safe
  • Oct 10, 40.91 m, −3 cm, Safe
Adjustments Watch Safe 40 42 44 46 48 50 52 Oct 4 Oct 7 Oct 10 Oct 4, 43.79 m, AdjustmentsOct 5, 43.71 m, −8 cm, AdjustmentsOct 6, 43.70 m, −1 cm, AdjustmentsOct 7, 43.68 m, −2 cm, AdjustmentsOct 8, 43.62 m, −6 cm, AdjustmentsOct 9, 43.54 m, −8 cm, AdjustmentsOct 10, 43.52 m, −2 cm, Adjustments 43.52 m at ~4 cm/day
La Plata since Oct 4, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 4, 43.79 m, Adjustments
  • Oct 5, 43.71 m, −8 cm, Adjustments
  • Oct 6, 43.70 m, −1 cm, Adjustments
  • Oct 7, 43.68 m, −2 cm, Adjustments
  • Oct 8, 43.62 m, −6 cm, Adjustments
  • Oct 9, 43.54 m, −8 cm, Adjustments
  • Oct 10, 43.52 m, −2 cm, Adjustments
Adjustments Watch Safe 398 399 400 401 402 403 Oct 4 Oct 7 Oct 10 Oct 4, 400.53 m, WatchOct 5, 400.54 m, +1 cm, WatchOct 6, 400.54 m, +0 cm, WatchOct 7, 400.54 m, +0 cm, WatchOct 8, 400.60 m, +6 cm, WatchOct 9, 400.61 m, +1 cm, WatchOct 10, 400.61 m, +0 cm, Watch 400.61 m
Cidra since Oct 4, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 4, 400.53 m, Watch
  • Oct 5, 400.54 m, +1 cm, Watch
  • Oct 6, 400.54 m, +0 cm, Watch
  • Oct 7, 400.54 m, +0 cm, Watch
  • Oct 8, 400.60 m, +6 cm, Watch
  • Oct 9, 400.61 m, +1 cm, Watch
  • Oct 10, 400.61 m, +0 cm, Watch
This week's 6 Daily Water Watches

Levels: AAA’s daily reservoir chart, Oct 4–10. Rain: USGS gauges within 12 km of each reservoir. Rates and dates are arithmetic, not forecasts. How we report.

In context — 787daily, from public data

  • Cidra39,643ACS 2020–2024 estimate1809Founded36 sq mi (93.3 km²)Area
About this analysisOriginal 787daily analysis of seven days of validated reservoir readings and AAA notices · Report an error
Cite this

Source: 787daily, “Water Week in Review: Carraízo Up 17 cm, Oct 4–10”, Oct 11, 2026 — https://787daily.com/news/2026-10-11-water-week-in-review-carraizo-up-17-cm-oct-4-10/

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Seven days of validated reservoir readings and AAA notices
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Every Water Week in Review

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About Water Week in Review

The reservoirs' week in one read: which lakes rose or fell, how the bands moved, and what the rationing calendar did.

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Seven days of validated reservoir readings and AAA notices
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