Total streamflow across the Sulphur River was last observed at 1,010 cfs, and is expected to yield approximately 2,003 acre-ft of water today; about 7% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 14,077 cfs, with recent peaks last observed on 2024-03-29 when daily discharge volume was observed at 35,270 cfs.

Maximum discharge along the river is currently at the Sulphur Rv Nr Talco reporting a streamflow rate of 1,010 cfs. However, the streamgauge with the highest stage along the river is the Sulphur Rv Nr Texarkana with a gauge stage of 9.57 ft. This river is monitored from 3 different streamgauging stations along the Sulphur River, the highest being situated at an altitude of 290 ft, the Sulphur Rv Nr Talco.