 The elevation of the North Fork Umatilla Wilderness ranges from , and is characterized by terrain that varies from gentle, sloping hills to extremely steep, timbered canyons below a high plateau.Common vegetation includes juniper, sagebrush, ponderosa pine, fir, spruce, lodgepole pine, and western larch.The North Fork Umatilla River supports a sizeable population of bull trout, as well as anadromous fish such as steelhead.