The Lower Pecos Red Bluff Reservoir watershed (HUC 13070001) covers an area of 2,214 square miles in west Texas. The area has a semi-arid climate with an average annual precipitation of 16 inches. The watershed is characterized by steep terrain and deep canyons with a range of elevation from 700 to 4,000 feet. The Pecos River is the primary water source in the watershed, which contributes to the Red Bluff Reservoir. The reservoir is known for its high levels of sediment and dissolved solids due to its location in a geological formation known as the Permian Basin. Snowfall is rare in the area, and the reservoir's water levels are mainly dependent on rainfall and river inflows. The watershed is also home to several endangered species, including the Pecos pupfish and the Comanche Springs pupfish. Over the past decade, the watershed has experienced long periods of drought, leading to low water levels in the reservoir.