The Brazos River 🌊 It was an important waterway before the Civil War, and efforts to improve it for navigation continued until the early twentieth century. The most important cities in the Brazos watershed are Lubbock, Graham, Waco, Temple, Belton, Freeport, and Galveston. Houston abuts the region along the Fort Bend and Brazoria county lines. The waters of the Brazos basin are administered by the Brazos River Authority, an autonomous state agency established by the legislature in 1929. In late