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Rio Grande De Anasco near San Sebastian water level

River gauge, Rio Grande De Anasco, Puerto Rico, United States

Directions

Right now

Normal for mid-October

Water level

2.82ft Down 0.31 ft over the last 24 hours

Flow
289 cfs
0 13 25 38 Highest onrecord 35.84 ft Minor floodstage 12.50 ft

History

History
246ftOct 16Oct 17Oct 18Oct 19Oct 20246ftOct 16Oct 18Oct 20
24ftSep 21Sep 28Oct 5Oct 13Oct 2024ftSep 21Oct 5Oct 20
246ftOct 2025Jan 2026Apr 2026Jul 2026Oct 2026246ftOct 2025Apr 2026Oct 2026
246ftJanMarMayJulSepNov2026246ftJanAprJulOct2026

20252026

Water level Normal range (10–90 %) Minor flood stage

What this means

Water levels are unremarkable at Rio Grande De Anasco near San Sebastian, where the gauge shows 2.82 ft.

That puts it 0.16 ft below the median of 2.98 ft for mid-October, based on 37 years of readings. It is 9.68 ft below the flood stage of 12.50 ft. A year ago it stood at 3.62 ft (−0.80 ft).

It is still going down, by 0.31 ft over the past 24 hours. The 30-day range is 2.31 ft – 6.57 ft.

Fall is often low-water season on rivers, until steadier rain returns.

Compared with 37 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
2.98 ft0.16 ft below the median for this date
Normal for this date
2.17 ft – 4.48 ft8 years in 10 fall in this range (37 years of records)
Same day last year
3.62 ft−0.80 ft
Lowest and highest in 30 days
2.31 ft – 6.57 ft
Lowest and highest in 12 months
2.04 ft – 4.94 ft
Highest on record
35.84 ftSeptember 20, 2017

Paddling and fishing conditions

Most paddlers and anglers will find the river in good shape at this stage.

For reference, flood stage is 12.50 ft.

What happens at each level

17.00 ft
Flood waters could reach houses close to the river in Sector Pagan, Sector Pozo Hondo and Barrio Playa. Road PR-2 will become impassable./erg-05-2025
15.50 ft
Flood waters could reach houses close to the river in Barrio Cidra and Barrio Espino./erg-05/2025
12.50 ft
Minor flooding of plantain fields. /OMS 8/11/2020
2.82 ft
Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

RankLevelDate
135.84 ftSeptember 20, 2017
234.50 ftSeptember 22, 1998
333.90 ftSeptember 16, 1975
426.77 ftMay 18, 1985
526.21 ftSeptember 18, 2022
621.94 ftOctober 7, 1985
721.43 ftMay 8, 2024
821.33 ftSeptember 10, 1996
920.33 ftSeptember 3, 2008
1019.61 ftOctober 26, 1971

Weather at the gauge

Rain in the last 3 days: 0.50 in. Rain that falls upstream can take hours or days to show up at a river gauge.

17 Sat 89° 73° 0.09 in, 100% Wind 7 mph
18 Sun 90° 71° 0.12 in, 100% Wind 4 mph
19 Mon 90° 72° 0.14 in, 100% Wind 4 mph
20 Tue 90° 70° 0.28 in, 100% Wind 5 mph
21 Wed 90° 70° 0.12 in, 76% Wind 5 mph
22 Thu 89° 69° 0.09 in, 84% Wind 7 mph
23 Fri 92° 72° 0.19 in, 61% Wind 5 mph

Forecast: Open-Meteo

Sunrise 06:24 AM Sunset 06:03 PM Daylight 11 hr, 39 min Waxing gibbous 72%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Rio Culebrinas at Highway 404 near MocaRiver gauge, Rio Culebrinas 10.51 ft Normal −11.13 ft 6.0 mi
Rio Rosario near HormiguerosRiver gauge, Rio Rosario 1.78 ft Very low −0.22 ft 9 mi
Rio Culebrinas at Margarita Damsite near AguadaRiver gauge, Rio Culebrinas 10.26 ft Very high −5.50 ft 10 mi
Canal De Derivacion at Lago De GuajatacaCanal gauge, Canal De Derivacion 3.27 ft Normal −0.14 ft 11 mi
Rio Guajataca below Lago GuajatacaRiver gauge, Rio Guajataca 7.85 ft Very high +0.16 ft 11 mi
Rio Guajataca at LaresRiver gauge, Rio Guajataca 8.61 ft Very high −0.10 ft 12 mi
Rio Guanajibo near HormiguerosRiver gauge, Rio Guanajibo 10.50 ft Low −0.33 ft 12 mi
Canal De Moca above Lago Regulador E13 IsabelaCanal gauge, Canal De Moca 1.66 ft Normal −0.13 ft 12 mi

Questions and answers

How does the Rio Grande De Anasco near San Sebastian compare with last year?

It is 0.80 ft lower than on the same day last year, when the reading was 3.62 ft.

What is flood stage for the Rio Grande De Anasco near San Sebastian?

The official flood stage is 12.50 ft. The level is currently 9.68 ft below it.

What is a normal level for the Rio Grande De Anasco near San Sebastian in mid-October?

The median for mid-October is 2.98 ft. In 8 years out of 10 the reading falls between 2.17 ft and 4.48 ft, based on 37 years of records.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Rio Grande De Anasco near San Sebastian today?

On Oct 20, 2026, 06:00 PM AST, the water level was 2.82 ft. Down 0.31 ft over the last 24 hours.

Is Rio Grande De Anasco near San Sebastian rising or falling?

Down 0.31 ft over the last 24 hours. Up 0.26 ft over the last 7 days.

Is the level of Rio Grande De Anasco near San Sebastian normal?

Normal for mid-October. Compared with 37 years of daily readings for this time of year.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Geological Survey
Station code
usgs:50144000 (Agency page)
Coordinates
18.28417, -67.05096 (WGS84)
Vertical datum
PRVD02
Update interval
every 15 minutes
Licence
Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Water level 2.82 ft 2026-10-20 22:00 Provisional
Flow 289 cfs 2026-10-20 22:00 Provisional

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How to cite

U.S. Geological Survey: Rio Grande De Anasco near San Sebastian (usgs:50144000). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/puerto-rico/rio-grande-de-anasco-near-san-sebastian

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.