My general rule of thumb there is to start with big and ugly flies – just because it’s fun to catch fish on something that “shouldn’t” work there. But in the end, you need some flies smaller than #20 just in case.
I prefer not going lower than 24… but like to carry a few smaller. Last night my vice time yielded a few #28 Al’s Rat’s. 1 is according to the pattern, the other two are my “version” which has a small gray zelon tuft popping out of the thorax… Hopefully these will interest those swift river fish in the months to come.
Beyond that were some small stream or what I’d call general trout flies like Mr Rapidian Parachute’s in #18, Dark Edison’s in #10, #10 Vladi Worms, some #18 Jail Bird’s, #20 sulfur spinners and #16 emergers…
Felt really good to get in a good solid block of Vice time… even if it ended at 11:30PM!