1981 Map of Twelvemile Ridge

About this map

Twelvmile Ranch sits at the heart of this high-desert landscape in Malheur County, where the ranching economy and rugged terrain dictate the few human imprints on the land. Surveyed in the mid-1970s and published by the Geological Survey in 1981, this map captures the sheer verticality of Twelvemile Ridge and the prominent height of Three Man Butte. Water is the primary sculptor of this environment, with the drainage systems of Duck Creek, Twelvemile Creek, and Dry Creek cutting through the upland. The Twelvemile Grade represents the primary logistical artery through the hills, while the inclusion of a Borrow Pit points to the practical infrastructure required to maintain routes in such a remote corner of eastern Oregon.