Rio Guanajibo near Hormigueros water level

Name: Rio Guanajibo near Hormigueros water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Rio Guanajibo, Puerto Rico, United States

Directions

Low for mid-October

Water level

10.63ft Down 0.55 ft over the last 24 hours

Measured Oct 20, 2026, 05:30 AM AST (1 hour ago)

Flow: 53.2 cfs

History

7 days 30 days 1 year Years compared

20252026

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

What this means

The Rio Guanajibo near Hormigueros is running below normal at 10.63 ft.

That puts it 1.41 ft below the median of 12.04 ft for mid-October, based on 33 years of readings. It is 9.37 ft below the flood stage of 20.00 ft. A year ago it stood at 11.18 ft (−0.55 ft).

It has dropped 0.55 ft over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. In the last month it has stayed between 9.59 ft and 12.51 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that.

Compared with 33 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 12.04 ft1.41 ft below the median for this date
Normal for this date: 9.56 ft – 16.10 ft8 years in 10 fall in this range (33 years of records)
Same day last year: 11.18 ft−0.55 ft
Lowest and highest in 30 days: 9.59 ft – 12.51 ft
Lowest and highest in 12 months: 9.31 ft – 16.09 ft
Highest on record: 29.40 ftSeptember 19, 2022

Floating and fishing near Rio Guanajibo near Hormigueros

Low water exposes gravel bars that make good wading access, but some boat ramps may be left high and dry.

Flood stage here is 20.00 ft, 9.37 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

34.86 ft: This was the crest the USGS reported during Hurricane Maria.
29.30 ft: This was the crest the USGS reported during Hurricane Fiona.
28.60 ft: This was the crest the USGS reported during Hurricane Maria.
26.00 ft: Extensive flooding along Urb. Valle Hermoso. Roads such as Calle Amapola will be impassable. Residential flooding is also expected along many houses in this area.
25.00 ft: Flooding along PR-2, km 162.4. The road will be impassable for smaller cars. The river will also overflow in the mouth, impacting PR-102 and some roads in Urb. Guanajibo Homes.
23.00 ft: Extensive flooding along PR-103. Critical infraestructure such as gas companies, water intakes, and recycling plants will be affected. The water depth will be around two to three feet.
22.50 ft: Flood waters reaching Urb. Monte Rio. Some roads will be impassable. The water will reach the basketball court and nearby houses.
22.00 ft: Flooding begin to affect PR-114, especially near Urb. Valle Hermoso. Flooding will at least affect Calle Rosa and Calle Violeta. Flood waters will also affect PR-309, with flood waters likely reaching residential areas.
21.00 ft: Flooding along the confluence with Rio Viejo at PR-103. The road will likely be alredy flooded from flood water from Rio Viejo. The road will be impassable with water depth of two to three feet.
20.00 ft: Flooding along PR-103 and PR-114, especially near the confluence with Rio Rosario. Water surges from Rio Rosario, especially with plant debris will make the river overflow before 20 ft, making these roads impassable. The pasture near the road will likely remain flooded, with ponding of water lasting days after the rain event.
16.00 ft: FLooding from tributaries will begin to affect pastures and some roads. If Rio Guanajibo continues to rise, most roads in the flood plain in Hormigueros and Cabo Rojo will likely be closed.
10.63 ft: Right now

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

Highest crests on record

Rank	Level	Date
1	29.40 ft	September 19, 2022
2	28.65 ft	September 21, 2017
3	28.50 ft	September 16, 1975
4	28.03 ft	September 22, 1998
5	28.00 ft	October 7, 1985
6	27.11 ft	August 25, 1988
7	26.33 ft	May 7, 2001
8	26.05 ft	August 15, 2024
9	25.37 ft	July 30, 2020
10	24.87 ft	October 8, 2010

Weather at the gauge

Rain in the last 3 days: 0.43 in. Rain that falls upstream can take hours or days to show up at a river gauge.

17 Sat 90° 72° 0.15 in, 93% Wind 5 mph

18 Sun 87° 74° 0.09 in, 100% Wind 5 mph

19 Mon 89° 73° 0.11 in, 100% Wind 4 mph

20 Tue 88° 73° 0.14 in, 92% Wind 7 mph

21 Wed 88° 73° 0.11 in, 58% Wind 8 mph

22 Thu 87° 74° 0.12 in, 80% Wind 11 mph

23 Fri 89° 75° 0.05 in, 65% Wind 10 mph

Forecast: Open-Meteo

Sunrise 06:24 AM Sunset 06:04 PM Daylight 11 hr, 40 min First quarter 67%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Rio Rosario near HormiguerosRiver gauge, Rio Rosario	1.88 ft	Low	−0.41 ft	4.3 mi
Canal De Riego De Lajas at Bo. BetancesCanal gauge, Canal De Riego De Lajas	1.35 ft	Normal	−0.17 ft	7 mi
Canal De Riego De Lajas at Bo. Palmarejo near LajasCanal gauge, Canal De Riego De Lajas	1.44 ft	Normal	−0.12 ft	8 mi
Canal De Riego De Lajas below Lajas Filt Plant LajasCanal gauge, Canal De Riego De Lajas	1.42 ft	Normal	−0.09 ft	9 mi
Canal Riego De Lajas above Lajas Filtration PlantCanal gauge, Canal Riego De Lajas	2.62 ft	Normal	−0.04 ft	9 mi
Rio Grande De Anasco near San SebastianRiver gauge, Rio Grande De Anasco	3.02 ft	Normal	−0.97 ft	12 mi
Canal De Riego De Lajas below Majinas Filt. PlantCanal gauge, Canal De Riego De Lajas	3.04 ft	High	+0.05 ft	15 mi
Canal De Riego De Lajas above Majinas Filt. PlantCanal gauge, Canal De Riego De Lajas	2.14 ft	High	+0.06 ft	15 mi

Questions and answers

How does the Rio Guanajibo near Hormigueros compare with last year?

It is 0.55 ft lower than on the same day last year, when the reading was 11.18 ft.

What is flood stage for the Rio Guanajibo near Hormigueros?

The official flood stage is 20.00 ft. The level is currently 9.37 ft below it.

What is a normal level for the Rio Guanajibo near Hormigueros in mid-October?

The median for mid-October is 12.04 ft. In 8 years out of 10 the reading falls between 9.56 ft and 16.10 ft, based on 33 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 Guanajibo near Hormigueros today?

On Oct 20, 2026, 05:30 AM AST, the water level was 10.63 ft. Down 0.55 ft over the last 24 hours.

Is Rio Guanajibo near Hormigueros rising or falling?

Down 0.55 ft over the last 24 hours. Up 0.35 ft over the last 7 days.

Is the level of Rio Guanajibo near Hormigueros normal?

Low for mid-October. Compared with 33 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:50138000 (Agency page)
Coordinates: 18.14268, -67.14875 (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

Parameter	Last value	Time (UTC)	Quality
Water level	10.63 ft	2026-10-20 09:30	Provisional
Flow	53.2 cfs	2026-10-20 09:30	Provisional

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How to cite

U.S. Geological Survey: Rio Guanajibo near Hormigueros (usgs:50138000). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/puerto-rico/rio-guanajibo-near-hormigueros

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.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer