The Lower Trinity Tehuacana Watershed (HUC 12030201) covers approximately 4,056 square miles in east-central Texas. It is characterized by a humid subtropical climate with hot summers and mild winters. The watershed includes various streams and rivers, with the main stem being the Trinity River. The hydrology of the watershed is affected by seasonal precipitation and flooding events, with the highest precipitation occurring in spring and fall. The watershed is not known for heavy snowpacks. Surface water quality is affected by agricultural activities, land use changes, and urbanization. The reservoirs within the watershed, including Lake Fairfield and Richland Chambers Reservoir, are used for water supply, recreation, and flood control. An interesting climatic fact is that the watershed experienced severe drought conditions from 2011-2015, which impacted water supply and agriculture. Climate change may exacerbate these conditions in the future.