DUFF CREEK. Duff Creek rises at the confluence of Goat Creek and Walnut Draw, 2½ miles east of Mitchell Mesa and just south of Black Canyon in west central Brewster County (at 29°59' N, 103°41' W), and runs south for nine miles before running dry at a point five miles south of Mitchell Mesa and a half mile south of the point where the Ditch rises (at 29°53' N, 103°41' W). Duff Creek is intermittent except for its first half mile and for a mile just past its midpoint, where it flows perennially. It traverses rugged terrain with numerous box canyons, surfaced by shallow, stony soils that support Mexican buckeye, walnut, persimmon, desert willow, scrub brush, and sparse grasses. On some maps Duff Creek and the Ditch are both labeled as the lower reaches of Goat Creek.