MISSISSIPPI RESERVOIR REPORT

Last Updated: December 24, 2025

The latest observations of the nation's dams and reservoirs present a mixed picture of water storage levels, with some areas experiencing surpluses due to recent inflows, while others face drought conditions with below-average water levels. Notably, major reservoirs such as Lake Powell in Arizona and Lake Mead in Nevada reveal a concerning trend, with storage levels falling significantly short of their historical averages, reflecting extended periods of drought and increased water demand in the Southwest. Conversely, California's Lake San Antonio has seen a surge in water levels, exceeding its average and demonstrating the variability of water supplies across different regions.

For water management researchers and hydrologists, the data underscores the importance of monitoring and adaptive management strategies to address the challenges posed by climate variability and human impact on water resources. Reservoirs like Lake Powell, currently at only 44% of average storage, and Lake Mead with less than half its average, are stark reminders of the long-term water scarcity issues facing the Colorado River Basin. Meanwhile, reservoirs such as California's Lake San Antonio, which now holds over twice its average storage, showcase the benefits of effective catchment during periods of heavy precipitation. The contrasting conditions highlight the need for dynamic management approaches that consider both the immediate and future water needs, in addition to the environmental and economic impacts of fluctuating water levels.

Mississippi has several major reservoirs, including Grenada, Ross Barnett, and Arkabutla. These reservoirs are fed by the Yalobusha, Pearl, and Coldwater rivers, respectively. Snowpack and mountains are not relevant in this area, as Mississippi is a relatively flat state. The hydrology in the area is heavily influenced by rainfall, with seasonal trends of higher flows in the spring and lower flows in the summer. Record levels of flooding have occurred in the past, notably in 1979 when the Mississippi River flooded and caused significant damage. However, drought conditions have also been an issue in recent years, with some reservoirs experiencing low levels of water. Overall, reservoirs and dams play an important role in managing water resources in Mississippi, providing water for irrigation, drinking water, and recreation.

Mississippi has several major reservoirs, including Grenada, Ross Barnett, and Arkabutla. These reservoirs are fed by the Yalobusha, Pearl, and Coldwater rivers, respectively. Snowpack and mountains are not relevant in this area, as Mississippi is a relatively flat state. The hydrology in the area is heavily influenced by rainfall, with seasonal trends of higher flows in the spring and lower flows in the summer. Record levels of flooding have occurred in the past, notably in 1979 when the Mississippi River flooded and caused significant damage. However, drought conditions have also been an issue in recent years, with some reservoirs experiencing low levels of water. Overall, reservoirs and dams play an important role in managing water resources in Mississippi, providing water for irrigation, drinking water, and recreation.