I've been fishing since I was eight, and smoking since I was sixteen, so inevitably, most of my fishing has been done high! I have two or three rivers available locally that hold brown trout - two tiny rivers (3m width), and one 'normal' (10m width) size. The season opened recently, and I'm heading out shortly to try them out - the floods last year wrecked a lot of the river fishing for a while, but the trout should be OK. However, I don't fly fish, so just adapt usual 'coarse' tactics - legered minnow or worms. Floats aren't allowed during the non-trout close-season, but trout being trout, they're easy to catch with these methods.
Don't have many pics online, but this was from a day out on a Trent weirpool last year - moored over 20 feet of turbulent water, we caught something like sixteen barbel up to ten pounds right under our feet - and they don't half pull back in those conditions, high or not! This one was six pounds four ounces - about 2.85 kilos: