JACOB'S CREEK. Jacob's Creek rises a mile from the western edge of the Devil's Backbone in northeastern Comal County (at 29°56' N, 98°11' W) and runs southwest for 2½ miles to its mouth on the eastern shore of Canyon Lake on the Guadalupe River (at 29°54' N, 98°12' W). The creek traverses an area of the Balcones Escarpment^qv characterized by steep slopes and limestone benches that give a stairstep appearance to the landscape along the creek. Soils in the area are generally dark, calcareous stony clays and clay loams with rock outcroppings, and local vegetation includes live oak and Ashe juniper woods. Jacob de Córdova^qv named the creek while surveying there on his birthday. Since the Canyon Dam was completed in 1964, the mouth of Jacob's Creek has become the site of a lakeside park and various residential developments.