Tujunga Wash is a major tributary to the Los Angeles River , providing about a fifth of its flow . Downstream of the dam , Tujunga Wash flows roughly south and is met halfway to its confluence with the Los Angeles River by Pacoima Wash , which drains the other side of the mountains that Little Tujunga Wash drains . Finally , Tujunga Wash meets the Los Angeles River near Studio City , California .