Photo: Clarence Inman Collection, 1953. The 5 Freeway now runs along the west side of the LA River (this side of the river). (Click on photo to enlarge.)
The Red Car Trolleys crossed the LA River on their own dedicated bridge (just to the right of the Hyperion Bridge in the photo above). The tracks continued south to Downtown along private rights-of-way on the slope above Riverside Drive on lots we we now call the Menlo Property (between Glendale Blvd and Fletcher), across the Fletcher Viaduct and further south on the Red Car Property to the 2 Freeway Corridor.