The Middle Allegheny Tionesta Watershed (HUC 05010003) covers a land area of approximately 2,778 square miles in northwestern Pennsylvania. The area is characterized by a mix of forested and agricultural lands, with some urban development. The hydrology of the watershed is dominated by the Allegheny River, which forms the western boundary of the region. The region experiences a continental climate with cold winters and warm summers. The snowpack in the region varies from year to year but typically accumulates to a depth of around 20 inches. The surface water in the watershed is primarily from the Allegheny River, which is used for drinking water, recreation, and fishing. The area has several reservoirs, including the Tionesta Lake, which has been found to contain high levels of mercury. Overall, the watershed experiences precipitation levels that are above average for the region, with an average of 42 inches of rain per year.