The Sulphur River is a river in northeast Texas and southwest Arkansas in the United States.
The Sulphur River begins in eastern Delta County, Texas, at the confluence of its north and south forks. This merger is about 5 miles (8 km) northeast of the town of Sulphur Bluff and about 95 miles (152 km) northeast of Dallas.
The river flows generally eastward through several Texas counties and provides most of the water for Wright Patman Lake, on the border between Bowie and Cass counties. Below Wright Patman Dam, the river continues its generally eastward flow to the Arkansas state line. The river flows southeastward through Miller County in extreme southwest Arkansas for 15 miles (24 km) until it joins with the Red River a few miles from the Louisiana border.
The Sulphur River provides numerous opportunities for fishing, boating, and other activities.
Above Wright Patman Lake, the river has enough water for recreation most of the time. The flow is slow, and the river is murky, largely due to channelization upstream. Below Wright Patman Dam, the river flow depends on the amount of water being released from the dam; however, water quality is usually good.
Wright Patman Lake provides additional opportunities for camping, boating, swimming, and fishing.
Sulphur River State Wildlife Management Area is located in Miller County, 16 miles south of Texarkana.This 16,000-acre area is owned by the Arkansas Game and Fish Commission.
The area consists of one of the last remaining large tracts of bottomland hardwood habitat along the Red
River Valley. The Sulphur River runs for approximately 10 miles through the management area. Mercer Bayou (an old river channel) located on the west side of the area consists of approximately 1000 acres and is approximately 9 miles long. Days Creek is a major tributary on the northeast side of the area. Bottomland hardwoods, cypress breaks, and the associated oxbows and sloughs dominate this area. A small portion of the area contains rolling hills with mixed pine-hardwood adjacent to the floodplain.
Access to this area is very limited, except by boat. The west side may be accessed by traveling south on SH 71 from Texarkana for approximately 15 miles and taking SH 237east, crossing Sulphur River and
continuing 2 miles and turning left onto Canal Access road and traveling to the canal access boat ramp.
This is a major access point for Mercer Bayou. Using the same directions, turning right off SH 237 at the
Smith Park entrance, and traveling approximately 2 miles you can access Long Slough and the Sulphur
River (there are boat ramps at both locations). The east side may be accessed by traveling south on SH 71from Texarkana approximately 20 miles to the Sulphur River bridge crossing. There is a boat ramp located at the bridge. Continuing 2 miles south, turn right on CR 6 at the AGFC sign. Follow the county road, taking all rights, approximately 3 miles to the area.