Wolf Creek Ravine is composed of a mixed deciduous-conifer stand dominated by big leaf maple (Acer macrophyllum), with minor contributions from red alder (Alnus rubra) and Douglas fir (Pseudotsuga menziesii).
Alnus rubra (Wikipedia) Alnus rubra, the red alder, is a deciduous broadleaf tree native to western North America (Alaska, Yukon, British Columbia, Washington, Oregon, California, Idaho and Montana).