Whether it is Box Canyon, Cardiac Canyon, or the lower river, you can bet that large stonefly nymphs are on the move towards shallow water. That means the whole array of large nymph patterns available from rubber legs to fancier renditions will be effective in waters such as these. Flow out of Island Park Dam is just under 1000 cfs and appears likely to remain at that level for the time being, so look for a stable river at least down to the Warm River-Robinson Creek and Fall River confluences for now. In addition to stonefly nymphs being effective, March brown and caddis life cycle patterns bring responses on the lower river, and bead head nymphs of choice bring action there and in Box Canyon waters. During our recent cold spell flow into the river coming from Fall River has decreased. However look for Fall River to put a lot more water into the river during the upcoming predicted warm weather.