DELAWARE RESERVOIR REPORT

Last Updated: March 24, 2026

Across the nation, a comprehensive analysis of the latest observations indicates a diverse picture of reservoir and dam water storage levels, with some areas experiencing surpluses while others face drought conditions. For instance, Lake Winnipesaukee in New Hampshire currently sits below its average gage height, possibly indicating lower water inputs, which could impact local water supply and recreational activities. In contrast, Prompton Reservoir in Pennsylvania is slightly above its average water surface elevation, reflecting adequate water accumulation, potentially from recent precipitation or controlled water releases.

Notably, several major dams and reservoirs are experiencing abnormal conditions for this time of the year, which could be attributed to various factors such as snowpack levels, river flows, or regional climatic shifts. For example, San Carlos Reservoir in Arizona is significantly below its average storage level, signaling drought stress that may affect agricultural irrigation and water conservation measures. Conversely, Lake San Antonio in California is well above its average, suggesting a surplus that could be linked to heavy rainfall or snowmelt. These deviations from the norm have implications for water management strategies, ecosystem health, agriculture, and urban water supply. As such, hydrologists and water management researchers must continuously monitor these changes to anticipate and mitigate the impacts on affected communities and the environment.

Delaware only has a few small reservoirs and dams, with the largest being the Hoopes Reservoir, which provides drinking water to the city of Wilmington. Other small reservoirs include the Killens Pond and Lums Pond. These reservoirs are fed by streams and creeks such as the Red Clay Creek and White Clay Creek. Snowpack and mountainous areas are not relevant in Delaware's hydrology, as the state is relatively flat. The region experiences a humid subtropical climate with hot summers and mild winters. There have been occasional drought conditions, such as in 2016 when Delaware experienced a moderate drought. Overall, the state's water supply is considered sufficient and reliably meets the needs of the population.

Delaware only has a few small reservoirs and dams, with the largest being the Hoopes Reservoir, which provides drinking water to the city of Wilmington. Other small reservoirs include the Killens Pond and Lums Pond. These reservoirs are fed by streams and creeks such as the Red Clay Creek and White Clay Creek. Snowpack and mountainous areas are not relevant in Delaware's hydrology, as the state is relatively flat. The region experiences a humid subtropical climate with hot summers and mild winters. There have been occasional drought conditions, such as in 2016 when Delaware experienced a moderate drought. Overall, the state's water supply is considered sufficient and reliably meets the needs of the population.