From the benchWith 43°F water and a hard frost overnight, fish will be sluggish until the sun fully warms the valley — don't rush to the river before 9:30 AM. Focus your nymphing on the deep, slow inside bends and undercut banks where fish are stacked and conserving energy; set your indicator depth to get your fly within 6 inches of the bottom. When the BWO hatch fires between 11 AM and 2 PM, switch to a size 22 dry or emerger and target rising fish in the flat tailouts with a long, fine tippet (5X or 6X) and a reach cast to avoid drag. Keep your approach low and slow — at 149 CFS and gin-clear conditions, these cutthroats will spook at a heavy footfall.