It occurs along the Pacific coast from southwest Washington to southern California, and also inland east to southeastern British Columbia, northern Idaho and western Montana, with isolated populations in interior northern British Columbia, the Black Hills in South Dakota, and on Guadalupe Island off Baja California.
Here, the river trail descends 300 feet in half a mile passing though temperate rain forest with moss covered Bigleaf Maple, Douglas-fir, Sword Fern and Salal and places to step off the trail and rest or enjoy the scenery.