You can do well still water nymphing along the drop-offs using a Crowley-esque tandem midge or pheasant tail rig suspended below an Under-cator. Trolling streamers from your tube at the ten foot depth is also productive and a few nice browns may be in the mix during the cloudy or lower light periods.

The river section is blown out most days as the LADWP is generating power and this raises the flows here a bunch. The reservoir will fluctuate in level considerably under these conditions - it is used as a "buffer". The flows remain consistent below the dam, however the level rises and falls depending on power generation. Hit the inlet to the lake from your tube when the genset is hooked up, the fish move towards the slow moving water.