The Mattaponi Watershed, located in Virginia, covers an area of approximately 1,558 square miles. The hydrology of the watershed is characterized by the Mattaponi River, which is a major tributary of the York River. The watershed is also known for its significant snowpack, particularly in the higher elevations of the Blue Ridge Mountains. Surface water quality in the watershed is generally good, but there are concerns regarding nutrients and sediment from agricultural runoff. Additionally, the watershed is home to several reservoirs, including the Diascund Reservoir, which supplies drinking water to the City of Newport News. Interesting climatic facts include the fact that the watershed experiences a humid subtropical climate, with hot summers and mild winters. Trends in the watershed include increased urbanization and agricultural development, which have led to water quality concerns and the need for increased conservation and restoration efforts.