PUERTO-RICO RESERVOIR REPORT

Last Updated: December 23, 2025

In a recent comprehensive analysis of the nation's dams and reservoirs, a mixed picture of water storage levels has emerged. Across various states, certain reservoirs are experiencing higher than average water levels, while others face significant deficits. For instance, Lake Winnipesaukee in New Hampshire is currently below its average gage height, while reservoirs such as John Martin in Colorado and San Luis in California are facing reduced storage volumes. Conversely, storage levels in reservoirs like Lake Mead in Nevada and Lake Powell in Arizona have declined to concerning levels, with Lake Mead currently holding less than half its average storage capacity. These conditions reflect broader regional patterns relating to precipitation, snowpack melt rates, and river flows which are crucial for water management and planning.

Particularly, in the western United States, reservoirs like Blue Mesa, Navajo, and Vega in Colorado are reflecting the persistent drought conditions with lower than average storage. Meanwhile, in California, despite recent wet conditions boosting storage in reservoirs such as Berryessa and New Melones, others like Oroville and Shasta are still recovering from previous deficits. This disparity highlights the complex and localized nature of water resource management, with some areas benefiting from targeted conservation efforts and water transfers. For hydrologists and water managers, the current dataset underscores the need for adaptive strategies to balance ecological needs, agricultural demands, and urban water use amidst variable climatic conditions. As the climate continues to present challenges, the insights gained from cross-referencing multiple data sources provide a clearer understanding of water storage trends and guide critical decision-making for sustainable water resource management.

Puerto Rico has several major reservoirs and dams that serve as critical sources of water for the island's population and agriculture. The largest reservoir is the Carraízo Lake, which is fed by the Rio Grande de Loíza and other smaller streams. Other major reservoirs include the Dos Bocas and Caonillas Reservoirs. The hydrology of the area is influenced by the central mountain range, which receives the majority of the precipitation and snowpack during the winter months. Drought conditions are common in Puerto Rico, and water conservation measures are often necessary to maintain adequate water supply. In recent years, the island has experienced record drought conditions, with some reservoirs dropping to historic lows. Seasonal trends show that the island's wet season is from May to November, while the dry season runs from December to April. Overall, the management and maintenance of Puerto Rico's reservoirs and dams remain critical to ensuring a reliable water supply for the island's population and agriculture.

Puerto Rico has several major reservoirs and dams that serve as critical sources of water for the island's population and agriculture. The largest reservoir is the Carraízo Lake, which is fed by the Rio Grande de Loíza and other smaller streams. Other major reservoirs include the Dos Bocas and Caonillas Reservoirs. The hydrology of the area is influenced by the central mountain range, which receives the majority of the precipitation and snowpack during the winter months. Drought conditions are common in Puerto Rico, and water conservation measures are often necessary to maintain adequate water supply. In recent years, the island has experienced record drought conditions, with some reservoirs dropping to historic lows. Seasonal trends show that the island's wet season is from May to November, while the dry season runs from December to April. Overall, the management and maintenance of Puerto Rico's reservoirs and dams remain critical to ensuring a reliable water supply for the island's population and agriculture.