Rim Chung’s RS2 is one of the most famous fly patterns used here in Colorado, and for good reason. It does not represent anything specific…but in that, it can represent anything! Works great when fished as an emerging midge or BWO and has served us well over the years when fishing the San Juan River. The foam wing RS2 seems to work when nothing else will.
Can be fished as a dry, emerger, or nymph.