Rio Grande De Anasco near San Sebastian, PR
River level and flood forecast · Anasco County
The river is 9.5 ft below flood stage (12.5 ft).
Flow: 357 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 Grande De Anasco near San Sebastian to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 19 ft |
| Moderate flood stage | 15.5 ft |
| Flood stage | 12.5 ft |
| Action stage | 11 ft |
| Record crest (September 20, 2017) | 35.84 ft |
What floods at each level
From the National Weather Service, highest first.
- 17 ftFlood 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
- 15.5 ftFlood waters could reach houses close to the river in Barrio Cidra and Barrio Espino./erg-05/2025
- 12.5 ftMinor flooding of plantain fields. /OMS 8/11/2020
Highest crests on record
- 35.84 ft — September 20, 2017
- 34.5 ft — September 22, 1998
- 33.9 ft — September 16, 1975
- 26.77 ft — May 18, 1985
- 26.21 ft — September 18, 2022
Recent crests: 14.56 ft (May 2, 2025) · 18.65 ft (August 14, 2024) · 21.43 ft (May 8, 2024) · 11.33 ft (May 7, 2024) · 26.21 ft (September 18, 2022)
Up and down the river, and nearby
- Rio Culebrinas at HWY 404 nr Moca, PR
- Rio Rosario near Hormigueros, PR
- Rio Culebrinas at Margarita Damsite nr Aguada, PR
- Rio Guajataca below Lago Guajataca, PR
- Rio Guanajibo near Hormigueros, PR
- Rio Guajataca at Lares, PR
- Canal de Riego de Lajas Abv Lajas Filtration Plant, PR
- Canal de Riego de Lajas at Bo. Palmarejo, PR
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SEBP4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.