The only experience of this type of fishing was on the Ouse at St Neots many years ago, although other stretches on the same river could produce the odd, and sometimes very good, fish, particularly where a side stream entered the main river. Generally speaking, it didn't pay to fish the main river when rising but snow on the ground (thus low temps) didn't seem to matter...
Not to say the fishing was prolific in any shape or form and maybe I did it purely to be by water (not to mention coming from London by train and not knowing what sort of river I would find!) but as far as I was concerned, if I wasn't by water I would never know what might be on offer! (Lob worms the best bet at such times, 'laying on' in a deepish slack IMHO)
Perhaps it comes down to 'need and desire' but a lot, lot better than sitting at home thinking about going in my book, even if it results in a blank! Live and learn, sort of thing....
Give it a go is my suggestion and even if you are only moderately successful those fish will be very, very special because of the effort made. I will make this same effort come the weeks end knowing only too well that a single fish (or blank!) will be my reward!