Chemehuevi Wash is an ephemeral drainage system in the Mojave Desert that flows through the arid landscapes of Mohave County, Arizona, and San Bernardino County, California. This intermittent watercourse originates in the desert terrain west of the Colorado River and flows generally eastward before meeting the Colorado River in the vicinity of Lake Havasu. The wash drains portions of the Chemehuevi Valley and surrounding bajadas, carrying flash flood waters during infrequent but intense desert storms.

The wash flows through classic Mojave Desert terrain characterized by creosote bush flats, scattered desert vegetation, and gravelly alluvial surfaces. During most of the year, Chemehuevi Wash remains completely dry, with water flowing only during and immediately after significant rainfall events. Flash floods can transform the wash from a sandy channel into a powerful torrent within minutes, making it unsuitable for recreational paddling. The ephemeral nature of desert washes means that predictable boating opportunities do not exist.

The surrounding landscape features desert pavement surfaces, stabilized sand dunes, and scattered desert vegetation including creosote, bursage, and occasional palo verde trees along the deeper channels. Wildlife in the area includes desert cottontail rabbits, coyotes, and various reptile species adapted to the extreme aridity. The region receives less than five inches of annual rainfall, with precipitation occurring primarily during winter months from Pacific storm systems and summer monsoon thunderstorms.

Archaeological evidence indicates long-term human use of the Chemehuevi Valley and wash corridor. The area contains prehistoric trails, artifact scatters, and other cultural resources associated with Native American groups, particularly the Chemehuevi people for whom the wash is named. Historic use included travel routes connecting the Colorado River to interior desert regions.

Access to Chemehuevi Wash is primarily from Interstate 40 near Needles, California, and from roads leading to Lake Havasu. The wash crosses beneath major transportation corridors in this sparsely populated desert region. The nearest significant communities are Needles in San Bernardino County and Lake Havasu City in Mohave County.

Safety considerations are paramount in this environment. Flash flooding poses extreme danger during storm events, with walls of water capable of sweeping through dry channels with little warning. Summer temperatures regularly exceed 110°F, creating life-threatening conditions for outdoor activities. No facilities exist along the wash, and visitors must be completely self-sufficient with adequate water, navigation equipment, and emergency supplies. The remote desert location means that assistance may be hours away in emergency situations.