SOUTH-CAROLINA RESERVOIR REPORT

Last Updated: March 13, 2026

As the latest observations reveal, the nation's dams and reservoirs are experiencing a variety of storage levels that merit attention from water management officials and hydrologists. Some reservoirs are facing surpluses while others grapple with lower than average water levels, factors that could impact water supply and ecosystem health.

For instance, Lake Winnipesaukee in New Hampshire is currently below its average gage height, which could indicate potential water shortages if such trends continue. Similarly, the Maurice R at Union Lake Dam in New Jersey shows a significant drop in streamflow, hinting at potential drought conditions. On the other hand, reservoirs like Greenwood Lake in New Jersey and Prompton Reservoir in Pennsylvania are slightly above their average water surface elevations, suggesting healthier water reserves.

In the Midwest, the Wanaque Reservoir in New Jersey is notably below its average elevation, raising concerns about water availability in the region. Conversely, General Edgar Jadwin Reservoir and Beltzville Lake, both in Pennsylvania, are experiencing slightly higher than average water levels. This could be a result of recent precipitation events or changes in water management strategies.

Out West, reservoirs such as the John Martin Reservoir in Colorado and Savage River Reservoir in Maryland are above average levels, potentially due to increased snowpack melting or successful conservation efforts. However, the O'Shaughnessy Reservoir in Ohio and Big Chapman Lake in Indiana are registering lower water levels, which may affect local water supply if trends persist.

Reservoir storage fluctuates due to various factors, including seasonal changes, precipitation patterns, and human management. The observed anomalies in water levels across different reservoirs underscore the importance of continuous monitoring and adaptive water management strategies to address the dynamic needs of communities and ecosystems. As such, water researchers and hydrologists are called upon to delve deeper into these patterns to ensure sustainable water resource management in the face of climatic variability and growing demand.

South Carolina has numerous small and large reservoirs and dams that play an important role in providing water for domestic, agricultural, and industrial purposes. Some of the major reservoirs in the state include Lake Marion, Lake Moultrie, Lake Murray, and the Jocassee Reservoir. These reservoirs are fed by various streams, rivers, and creeks, including the Savannah River, Catawba River, Broad River, and Saluda River. The hydrology of South Carolina is influenced by its location in the southeastern United States and its proximity to the Appalachian Mountains. The state receives ample rainfall throughout the year, with occasional drought conditions during the summer months. The mountains in the western part of the state contribute to snowpack, which can affect streamflow and reservoir levels during the spring and early summer. Record flooding has occurred in South Carolina in recent years, such as the 2015 floods that resulted in widespread damage and loss of life. In contrast, drought conditions have also been experienced, such as the severe drought in 2016 that led to water restrictions and low reservoir levels. Seasonal trends in streamflow and reservoir levels vary depending on rainfall patterns and other factors.

South Carolina has numerous small and large reservoirs and dams that play an important role in providing water for domestic, agricultural, and industrial purposes. Some of the major reservoirs in the state include Lake Marion, Lake Moultrie, Lake Murray, and the Jocassee Reservoir. These reservoirs are fed by various streams, rivers, and creeks, including the Savannah River, Catawba River, Broad River, and Saluda River.

The hydrology of South Carolina is influenced by its location in the southeastern United States and its proximity to the Appalachian Mountains. The state receives ample rainfall throughout the year, with occasional drought conditions during the summer months. The mountains in the western part of the state contribute to snowpack, which can affect streamflow and reservoir levels during the spring and early summer.

Record flooding has occurred in South Carolina in recent years, such as the 2015 floods that resulted in widespread damage and loss of life. In contrast, drought conditions have also been experienced, such as the severe drought in 2016 that led to water restrictions and low reservoir levels. Seasonal trends in streamflow and reservoir levels vary depending on rainfall patterns and other factors.