I know of a guy that caught fish yesterday and the day before on the Sandy. Sure, the conditions were and still are less than ideal but the fish do not vanish when the water rises and gets dirty. They move to softer water closer to shore. I have caught fish in flows from 400cfs to 7000cfs on the Sandy, different water levels just change where the fish hold. I generally do not wait for rivers to get into shape. I have one to two days a week to fish and I pretty much go no matter what the river decides to do on my days off. If you do not catch fish, I guarantee you will at least still learn something that will be useful later down the road.