The Upper Angelina Watershed (HUC 12020004) covers approximately 1,062 square miles in northeastern Texas, USA. The area is characterized by a humid subtropical climate with hot summers and mild winters. The watershed is fed by several streams and tributaries, including the Angelina River, which serves as a primary source of surface water for the region. The area's hydrology is impacted by various factors, including land use changes, urbanization, and climate variability. Snowfall is infrequent in the Upper Angelina Watershed, and snowpack accumulation is generally not a significant concern for the area's water resources. Surface water in the region is mainly used for municipal, industrial, and agricultural purposes. Reservoirs within the watershed, including Lake Sam Rayburn and Lake Nacogdoches, provide drinking water and recreational opportunities for residents and visitors. Climate change is expected to have a significant impact on the Upper Angelina Watershed, with increasing temperatures and changes in precipitation patterns likely to affect water availability and quality in the region. The area is also prone to severe weather events, including floods and droughts, which can have significant impacts on local communities and infrastructure.