The Middle White Watershed (HUC 10140202) covers an area of approximately 3,300 square kilometers in the state of New Hampshire, USA. It is part of the larger Piscataqua River Basin, which ultimately drains into the Atlantic Ocean. The watershed is characterized by a cold, humid climate with short summers and long, snowy winters. The snowpack plays a crucial role in the hydrology of the watershed, as spring snowmelt provides most of the surface water flow. The watershed contains several small lakes and ponds, as well as the Ossipee Lake Reservoir. The major surface water quality concern in the watershed is elevated levels of phosphorus, which can lead to harmful algal blooms. Climate change is expected to result in warmer winters, reduced snowpack, and altered patterns of precipitation, which could have significant impacts on the hydrology and ecology of the watershed.