Sounds like a size 22 RS2 will do well there, as it does everywhere. Thank you, Rim Chung. On the weight issue, out west they say the difference between a good fly fisherman and a great one is one split shot. True words, my default setting is a split shot 18" above to get it down; that said free form fishing nymphs probably works right if emergers are around.
Just my $.02, probably worth less and YMMV.