MCKAY CREEK. McKay (McKey, McKee) Creek rises three miles northwest of the Harkins Ranch headquarters on the Pecos county line in northwestern Terrell County (at 30°29' N, 102°21' W) and runs southeast for twenty-eight miles to its mouth (at 30°19' N, 102°01' W) on Big Canyon, five miles southeast of the Continental Ranch headquarters. Its path dissects massive limestone on flat plains and crosses wash deposits on steep to gentle slopes. The local soils are generally dark, calcareous stony clays and clay loams; area vegetation includes scrub brush, oaks, junipers, grasses, and mesquites. The creek was named for John McKay, a bachelor who settled near the creek and ranched there until he was murdered by a hired hand.
Terrell County Heritage Commission, Terrell County, Texas (San Angelo: Anchor, 1978).