Home to approximately 22,000 Arkansans (2000 Census), the McKinney-Posten Bayous watershed lies within the Red River Basin in Southwest Arkansas crossing a little into Texas.  The hydrologic unit code for this watershed is 11140201. Upstream watersheds include Pecan-Waterhole (11140106), Lower Little (11140109), and Lower Sulphur (11140302).  The Middle Red-Coushatta (Texas) is downstream.

• Hempstead
• Howard
• Lafayette
• Little River
• Miller

• Bois D'arc Creek
• Bridge Creek
• Maniece Bayou
• Mckinney Bayou
• Posten Bayou
• Red Chute Creek
• Red River

• Forest: 43.6%
• Grassland: 21.1%
• Cropland: 20.9%
• Transitional: 9.8%
• Water: 3.5%
• Suburban: 1.3%
• Urban: 0.2%

Data Source: CAST