After passing under the State Route 118 ( Ronald Reagan Memorial Freeway ) , it is then encased in a concrete flood control channel , traveling southwards through Chatsworth , Canoga Park , and Winnetka . Its confluence with the Los Angeles River is just west of Mason Avenue and north of Vanowen Avenue . The channel walls near Winnetka were damaged in the 1994 Northridge earthquake
1994 Northridge earthquake
1994 Northridge earthquake
Browns Canyon Wash