Targeting walleye on the fly outside of the the spring run will be pretty tough. I don’t know anyone that catches them much on purpose with conventional gear, but there must be someone. I have caught them on the fly to the tune of one or two per trip, on purpose, in April and May, at a location near Toccoa, if that counts as “successful”. The place is only 1/8 mile long, but is best accessed with some kid of paddle craft. If you’re interested in that, I’d be happy to share the details by email. I’ve eaten every one of the dozen or so I’ve caught.
G