The Upper West Fork Trinity watershed (HUC 12030101) covers an area of approximately 1,040 square miles in Texas. It is fed by several tributaries and has a complex hydrology system. The area experiences a Mediterranean climate, with hot summers and mild winters. The watershed receives an annual average of approximately 38 inches of precipitation, with a significant portion of it occurring during the winter months.
The snowpack in the Upper West Fork Trinity watershed is not significant, and the area is not known for heavy snowfall. Surface water in the watershed is mostly groundwater-fed, and there are several small reservoirs in the area used for irrigation and recreation. The watershed is prone to droughts, and water scarcity is a concern for the local communities.
In recent years, the area has seen an increase in extreme weather events, including floods and droughts. These trends are expected to continue due to the impacts of climate change.