The Double Mountain Fork Brazos River begins as a shallow draw near the eastern edge of the Llano Estacado in Lynn County, about northeast of the small farming community of Draw, Texas. The stream generally runs eastward across southern Garza County, where it is fed by springs, providing a minimal base flow that is intermittently punctuated by rainfall and associated runoff. At the western edge of Kent County, about east-northeast of Justiceburg, the Double Mountain Fork merges with the North Fork. The Double Mountain Fork then continues eastward across southern Kent County, northwestern Fisher County, and into southern Stonewall County, where it passes to the south of Double Mountains, a pair of flat-topped hills located southwest of Aspermont, Texas. Double Mountains form part of the high ground dividing the watersheds of the Salt Fork to the north and the Double Mountain Fork to the south. To the east of Double Mountains, the Double Mountain Fork flows into western Haskell County before turning north and back westward into eastern Stonewall County, where it merges with the Salt Fork to form the Brazos River (proper), northeast of Aspermont, Texas.