PUERTO RICO FLOW REPORT

Last Updated: December 22, 2025

Puerto Rico's river enthusiasts should be aware of the diverse streamflow conditions across the island. The current data shows significant variability, with some rivers experiencing flows much lower than their seasonal norms, while others are experiencing higher than normal levels that may raise concerns for flooding. Notably, the Rio Culebrinas at the Margarita Damsite near Aguada is currently flowing at 1640 cubic feet per second (cfs), which is a substantial 188.62% of its normal flow, marking a significant jump of 47.75 cfs in the last 24 hours and indicating potential flooding risks. Conversely, the Rio Grande De Arecibo near San Pedro is running at just 24% of its typical flow, suggesting a possible flow drought in the region.

For those closely monitoring river conditions, the Rio Grande De Arecibo, with sites near Utuado and San Pedro, shows contrasting streamflow patterns. The site below Utuado is at a gage height of 4.62 feet with a flow of 145 cfs, which has decreased slightly in the last day. In contrast, the Rio Grande De Arecibo near San Pedro, despite steady flow in the last 24 hours, is at a much lower-than-average flow rate for the season, at a gage height of 6.66 feet and a flow of 118 cfs. Meanwhile, the Rio Guanajibo near Hormigueros flows at a strong 206 cfs, 102.98% of its normal rate, although it decreased by 8.44 cfs recently. The Rio Grande De Anasco near San Sebastian flows at 279 cfs which is moderately below normal at 48.55%, with a small recent increase in streamflow. Water and whitewater enthusiasts, especially those near the Rio Culebrinas and surrounding watersheds and communities, should remain vigilant for high water levels, while those interested in the Rio Grande De Arecibo may need to be prepared for lower flows, potentially affecting recreational activities and water resource management.