The Lower Arkansas Region encompasses 4,657 square miles in eastern Oklahoma. The region is supplied by four major rivers: the Arkansas, Canadian, Illinois, and Poteau.

The Lower Arkansas Region accounts for 11% of the state’s total water demand. Surface water supplies are used to meet about 91% of the region’s demand. The largest demand sectors are Thermoelectric Power (54%), Municipal and Industrial (15%), and Crop Irrigation (13%).

By 2060, this region is projected to have a total demand of 319,650 acre-feet per year (AFY), an increase of 117,760 AFY (58%) from 2010.