Jamie,
Try swinging a couple of wetflys or soft hackles from upstream down into the target area. Stay back 30-40 ft and roll cast across and let swing across the strike zone and twitch it with your fingertips. Worked wonders for me couple weeks ago.
Use dark or peacockherl bodies. But really any thing in the way of wetflys should do.
Might see some caddis too...if you see rising fish cover them.