Tujunga canyon, its the only spot I can think of right now. Problem is the water goes low or drys up sometimes. I dont know how the water is now. The last few times I was there I actually could see fish in the water. Trouts, catfish and sunfish.
It's actually on victory blvd and woodman those are the cross roads it's an ok place if your still looking to fish in/around l.a pm means I'll give you some good placed