PENNSYLVANIA RESERVOIR REPORT

Last Updated: January 2, 2026

In Pennsylvania, the latest observations of reservoirs and dams reveal a mixture of conditions, with some water bodies reflecting levels different from their historical averages for this period. The Prompton Reservoir and General Edgar Jadwin Reservoir are close to their average storage levels, with Prompton Reservoir slightly below at 1125 feet compared to its average of 1125.34 feet, while Jadwin Reservoir is above average at 991 feet versus 989.22 feet. However, Beltzville Lake near Parryville, Blue Marsh Lake, and Indian Rock Dam show more significant deviations. Beltzville Lake's current level stands at 625 feet, below its average of 627.57 feet. Similarly, Blue Marsh Lake is at 285 feet, lower than the average of 287.9 feet. Indian Rock Dam shows a more considerable drop with a current level of 371 feet against an average of 375.38 feet. In contrast, Lake Arthur at Moraine State Park is maintaining its average level at 1190 feet.

These variations in reservoir and dam levels across Pennsylvania could be linked to regional differences in weather patterns as suggested by recent reports indicating above-normal snowfall in the state, along with Michigan, Ohio, and New York. Such increased snowpack could potentially lead to higher inflows for some reservoirs once melting commences. However, the lower-than-average levels at certain sites such as Blue Marsh Lake and Indian Rock Dam may be due to factors such as increased water usage, evaporation, or less snow in their specific watersheds. As residents in affected communities like Roslyn stay alert for updates via local platforms such as city pages and social media, overall, the state's water management authorities will need to monitor these various conditions closely. The discrepancies in water levels emphasize the importance of adaptive water management practices in response to fluctuating weather patterns and their impact on regional hydrology.

Pennsylvania has more than 3,000 dams and the majority of them are used for flood control, irrigation and recreational purposes. Some of the major reservoirs in the state are Raystown Lake, Lake Wallenpaupack, and Blue Marsh Lake. These reservoirs are supplied by streams, rivers and creeks such as the Juniata River and the Lackawaxen River. The snowpack in the Pocono Mountains and the Allegheny Mountains contributes to the water supply of these reservoirs. The hydrology in the area is influenced by the Appalachian Mountains and the Atlantic Ocean. The state has experienced record low water levels in some reservoirs during drought conditions. Seasonal trends show that water levels are typically highest in the spring due to snowmelt and lowest in the fall. Overall, these reservoirs play a crucial role in supplying water for the state's agriculture, industries and residents.

Pennsylvania has more than 3,000 dams and the majority of them are used for flood control, irrigation and recreational purposes. Some of the major reservoirs in the state are Raystown Lake, Lake Wallenpaupack, and Blue Marsh Lake. These reservoirs are supplied by streams, rivers and creeks such as the Juniata River and the Lackawaxen River. The snowpack in the Pocono Mountains and the Allegheny Mountains contributes to the water supply of these reservoirs. The hydrology in the area is influenced by the Appalachian Mountains and the Atlantic Ocean. The state has experienced record low water levels in some reservoirs during drought conditions. Seasonal trends show that water levels are typically highest in the spring due to snowmelt and lowest in the fall. Overall, these reservoirs play a crucial role in supplying water for the state's agriculture, industries and residents.