Been having some great discussion with tightline - man is a legend!
Could I direct you guys to this link.....
Third picture down - where half of LA is playing in the water.... Are these sections worth a shot? Don't look particularly trouty from my experience - my thinking is I'd be better off heading way further up.
But then I'm hearing to head to the East fork of San Gabriel - and these are the pics that come up with an internet search.
Love to hear some thoughts,