The Lower Washita Region encompasses 6,192 square miles in southern Oklahoma. The region is supplied by four major rivers: the Red River, the Washita River, Mud Creek, and Walnut Bayou.

The region accounts for about 4% of the state�s total water demand. Surface water supplies are used to meet 49% of the region�s demand. The largest demand sectors are Municipal and Industrial (39%) and Crop Irrigation (36%).

By 2060, this region is projected to have a total demand of 117,200 acre-feet per year (AFY), an increase of approximately 37,000 AFY (46%) from 2010.