The West Walker River is a tributary of the Walker River, approximately 95 miles (153 km) long, in eastern California and western Nevada in the United States. It drains part of the Sierra Nevada range along the California-Nevada border in the watershed of Walker Lake in the Great Basin.It rises from snowmelt in the Sierras of northwestern Mono County, north of Yosemite National Park approximately 20 miles (32 km) SSW of Walker in the Emigrant Wilderness.