Tujunga Wash is a 13.0-mile-long (20.9 km) stream in Los Angeles County, California. It is a tributary of the Los Angeles River, providing about a fifth of its flow, and drains about 225 square miles (580 km2). It is called a wash because it is usually dry, especially the lower reaches, only carrying significant flows during and after storms, which usually only occur between November and April.
Tujunga Wash consists of two forks, both beginning in the San Gabriel Mountains. The upper portion of Big Tujunga Wash is called Tujunga Creek, or Big Tujunga Creek. It travels roughly east to west, and several tributaries from the north and south join it as it flows to Big Tujunga Reservoir, formed by Big Tujunga Dam. Below the dam, the stream is called Big Tujunga Wash.