The river is in motion. It carves a path that erodes its rocky bottom and gnaws at its bordering banks. It cuts lanes and moves channels, constantly shaping the valley into something new. And within the river’s path is structure — all the things that give a river character: logs, tree parts, rocks, boulders, gravel bars and rootsy banks. That structure forms seams where trout live. (Find the seams and you’ll find fish.) And the best way to see them . . . is to look way upstream.
The structure in your favorite large river or small brookie stream creates seams extending well beyond what is obvious. The two distinct lanes running along each side of a midstream boulder create a third zone, a stall, right in the middle. It’s easy to see those three water features up close to the rock, but the further downstream the water travels, the more those features fade and blend into each other. And such is the beauty of a trout stream.