Rio Guanajibo near Hormigueros, PR

River level and flood forecast · Hormigueros County

Normal10.4 ftas of Tue 1:30 AM

The river is 9.6 ft below flood stage (20 ft).

Flow: 46 cubic feet per second (USGS).

The last 7 days and the forecast

NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.

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An email when the National Weather Service forecasts Rio Guanajibo near Hormigueros to flood, when it floods, and when it's over.

Flood stages

Major flood stage	26 ft
Moderate flood stage	22 ft
Flood stage	20 ft
Action stage	16 ft
Record crest (September 19, 2022)	29.4 ft

What floods at each level

From the National Weather Service, highest first.

34.86 ftThis was the crest the USGS reported during Hurricane Maria.
29.3 ftThis was the crest the USGS reported during Hurricane Fiona.
28.6 ftThis was the crest the USGS reported during Hurricane Maria.
26 ftExtensive 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 ftFlooding 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 ftExtensive 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.
22.5 ftFlood waters reaching Urb. Monte Rio. Some roads will be impassable. The water will reach the basketball court and nearby houses.
22 ftFlooding 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 ftFlooding 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 ftFlooding 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 ftFLooding 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.

Highest crests on record

29.4 ft — September 19, 2022
28.65 ft — September 21, 2017
28.5 ft — September 16, 1975
28.03 ft — September 22, 1998
28 ft — October 7, 1985

Recent crests: 21.2 ft (May 3, 2025) · 26.05 ft (August 15, 2024) · 22.36 ft (May 8, 2024) · 21.12 ft (October 28, 2022) · 21.17 ft (October 18, 2022)

Up and down the river, and nearby

See it on the live map →Radar & warnings for Hormigueros County NWS gauge page USGS gauge 50138000

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (HORP4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.