The Middle Potomac Catoctin Watershed (HUC 02070008) covers an area of approximately 1,401 square miles in Maryland and Virginia. Its hydrology is primarily influenced by the Potomac River, which supports a variety of aquatic life and recreational activities. The region experiences significant snowfall during the winter months, with an average snowpack of around 20 inches. Surface water in the watershed is characterized by a variety of streams and creeks that support a diverse range of aquatic habitats. There are several reservoirs within the watershed, including the Potomac River Reservoir and the Little Seneca Reservoir, which provide drinking water to the surrounding communities. Interesting climatic facts include the region's susceptibility to strong thunderstorms during the summer months, as well as its vulnerability to flooding. In recent years, the region has experienced an increase in average annual temperatures and a decrease in precipitation.