In this video, Devin Olsen from Tactical Fly Fisher breaks down how to read pocket water hydraulics and identify where trout hold around river boulders. He explains how boulders split currents into three key holding zones: the downstream pocket areas (where the prime target is the slowed, less turbulent water just below where split currents meet), the sides of boulders (where undercuts and friction create resting zones), and the upstream velocity cushion (where water slows as it climbs over barely-submerged rocks). To effectively fish these spots without drag from conflicting currents, Devin suggests using a single-nymph Euro-nymphing setup for downstream and side lies.
I especially liked how he covered the bank rocks and pointed out that boulders along the banks are often hidden goldmines. He explains that bank rocks combine boulder structure with natural shoreline flow, creating small eddies where fish can rest without fighting heavy currents. It’s a great tip because those side pockets are so easy to walk right past.
