NEW-JERSEY 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.

New Jersey has several major reservoirs, including the Manasquan Reservoir, the Round Valley Reservoir, and the Wanaque Reservoir. These reservoirs are fed by a variety of streams and rivers, including the Manasquan River, the Raritan River, and the Wanaque River. The state's location in the northeastern United States means that snowpack and mountain runoff are important factors in the hydrology of the area. Record levels and drought conditions have been observed in New Jersey in recent years, with severe drought conditions experienced in 2020. Seasonal trends show that streamflow and reservoir levels tend to be highest in the spring and lowest in the fall, with the summer months often experiencing drought conditions. Despite these challenges, New Jersey has worked to improve its water infrastructure, including dam and reservoir management, to ensure a reliable supply of clean water for its residents.

New Jersey has several major reservoirs, including the Manasquan Reservoir, the Round Valley Reservoir, and the Wanaque Reservoir. These reservoirs are fed by a variety of streams and rivers, including the Manasquan River, the Raritan River, and the Wanaque River. The state's location in the northeastern United States means that snowpack and mountain runoff are important factors in the hydrology of the area.

Record levels and drought conditions have been observed in New Jersey in recent years, with severe drought conditions experienced in 2020. Seasonal trends show that streamflow and reservoir levels tend to be highest in the spring and lowest in the fall, with the summer months often experiencing drought conditions. Despite these challenges, New Jersey has worked to improve its water infrastructure, including dam and reservoir management, to ensure a reliable supply of clean water for its residents.