HACKBERRY CREEK (Sterling County). Hackberry Creek rises twelve miles northwest of Sterling City in northern Sterling County (at 32°00' N, 101°06' W) and runs north for twelve miles to its mouth on Mustang Creek, near Farm Road 2183 in southern Mitchell County (at 32°12' N, 101°02' W). The stream traverses rolling to flat terrain surfaced by clay and sandy loams that support grasses and some water-tolerant hardwoods.