Favourite quote of our fly fishing education program " if you have not caught any fish or lost any flies - what do you know?" You are not deep enough!!! In any given fly fishing moment you could be casting to surface eating fish - no depth required -- just a great presentation of a close matching imitation of the keyed into hatch of that moment. However, the rest of the day when no hatch is present - where are the fish. they are on the bottom, your presentations must get down to them. So change up and experiment till you loose a fly or two to the river bottom. Now you know you fished the appropriate parts of the river for that time.
Another flooded river for a few days but when this returns to normal all the weeds and algae are going to be cleared away. it will be the best fishing so far this year next week is my estimate.