California Wash is an arroyo tributary to the Muddy River, in Clark County, Nevada. Its mouth is at its confluence with the Muddy River over a mile southwest of Moapa and a mile and a half west of Glendale, Nevada. Its source is at an elevation of 3320 feet at the southwestern end of the Muddy Mountains, at 36°17′14″N 114°48′09″W / 36.28722°N 114.80250°W. From there it drains northeastward to its mouth on the Muddy River.[1]