I usually fish the spillway right out of Twin Lakes, when I'm up there. Usually catch alot of pan size trout but nothing huge... Nice pink meat instead of mushy stocker meat.
I havent been up there this year though.
As strange as it may sound, I've had good success with a Dave's Hopper (large) and trailing a size 14 Beadhead Prince on about 3' of tippet beneath it this time of year. The beadhead means that the Prince gets down in the riffles in the upper part of the Arkansas where it's kind of shallow anyway. Good luck!