YANCEY CREEK. Yancey Creek, formerly known as Elliott Creek, rises at the confluence of the Middle Fork and South Fork of Yancey Creek, five miles southwest of Nix in southwestern Lampasas County (at 31°03' N, 98°25' W). Big Spring is located at the point where the streams converge. The stream flows in a southwesterly direction for four miles to its mouth on the Colorado River, just north of the Burnet county line and just east of the San Saba county line (at 31°02' N, 98°26' W). Its course crosses an area of the Grand Prairies,^qv characterized by generally flat, locally dissected terrain, and passes near its mouth into the eastern edge of the Edwards Plateau.^qv Soils in the area are generally shallow, stony clays and loams, and vegetation consists primarily of grasses and open stands of live oak, Ashe juniper, and some mesquite.