Yeah, it's almost that time again....summer..... And yes there are trout in there. That picture looks a little futher downstream but yes summer+weekends= more than half of LA in that river. I dont think you should have any problems with swimmer on your trip, probably gold panners though but only a couple. What I have figured out, the farther you go, the less swimmers you run into. They aren't willing to hike a mile or 2 and just think, you can hike 7 or 8 miles back in there
Hope I can get you on some fish!