PUERTO RICO FLOW REPORT
Last Updated: December 25, 2025
Puerto Rico's rivers have shown a dynamic range of streamflow conditions recently, with several watercourses experiencing substantial changes that are significant for river enthusiasts, conservationists, and local populations alike. Notably, the Rio Limon above Lago Dos Bocas witnessed an extreme streamflow increase over the last 24 hours, with a staggering change of 1445.45 cubic feet per second (cfs), reaching a current flow of 221 cfs which is 224.05% of its normal flow, indicating potential flooding risks. This abnormal rise may impact communities around Lago Dos Bocas and could affect whitewater activities. Similarly, the Rio Grande de Loiza below the dams at Loiza saw a massive surge in flow, increasing by 11873.68 cfs, highlighting a significant flooding threat. Furthermore, the Rio Guadiana near Guadiana exhibited an extraordinary increase in streamflow, with a current flow of 293 cfs, which is 837% of normal, and the Rio Gurabo below El Mango also surged to 232 cfs, which is 538.94% above the expected level. These figures suggest that those planning river activities should exercise caution and stay informed about current conditions.
On the other hand, the Rio Grande de Arecibo near San Pedro reported a current streamflow of 138 cfs, which is actually below the norm by 55.45%, hinting at lower water levels that might affect some recreational activities or water supply. Cities like Utuado, Arecibo, and Caguas could see impacts due to these fluctuations in nearby rivers. The Rio Cibuco at Vega Baja and the Rio Culebrinas at the Margarita Damsite near Aguada, both vital to their respective watersheds, have recorded high flows at 534 cfs (194.43% of normal) and 1640 cfs (188.62% of normal), respectively, potentially affecting downstream areas. These patterns point to a season of notable variability, with possible implications for flood control, water resource management, and the enjoyment of Puerto Rico's riverine environments. River and water enthusiasts should remain vigilant, monitor updates closely, and be prepared for rapidly changing conditions in the region's waterways.
Puerto Rico has a tropical climate with high precipitation rates, intense storms, and frequent floods. The island has several major surface flows, including the Rio Grande de Loiza, Rio de La Plata, and Rio de La Seda. There are several dams and reservoirs to control water flow, with Carraizo and La Plata being the largest. The island's hydrology is influenced by the topography, bedrock, soil, and vegetation. The watershed management plan is based on the need to reduce flooding and erosion, improve water quality, and conserve natural resources. The snowpack has no correlation with hydrology in Puerto Rico due to its tropical location. The island is prone to flash floods and landslides, which are worsened by deforestation, urbanization, and climate change.
Winter Storm Warnings
December 25 2025
Residents and visitors of Puerto Rico must exercise extreme caution along the north-facing beaches, including prominent areas such as Pinones, Loiza, Aguadilla, Arecibo, Barceloneta, Manati, Vega Baja, San Juan, and Aguada, due to a Rip Current Statement and High Surf Advisory in effect until 6 PM AST. Life-threatening rip currents and large breaking waves up to 10 feet pose significant risks. Swimming conditions are dangerous, and there is potential for beach erosion and hazardous impacts from high waves. It is imperative to stay informed and avoid affected coastal regions to ensure personal safety.