Manzanita Creek Research Natural Area Establishment Record

The southwest summit of the Twin Sisters Mountain (5916 ft [1803 m]), the large pristine watershed, and the diversity of vegetation types are the principal distinguishing features of the Manzanita Creek Research Natural Area. At least eight SAF forest types are included in the RNA. Taylor and Teare classified the vegetation cover into seventeen plant associations after extensive sampling of the area. These include riparian types as well as forest types ranging from foothill (or gray) pine (Pinus sabiniana) to montane white fir (Abies concolor).