Water clarity can change how trout see, track, and respond to your fly. This guide explains how to adjust fly size, colour, contrast, movement, and weight for clear, stained, and murky Bow River conditions—helping Calgary anglers make smarter fly choices and spend less time guessing on the water.

Stonefly season is one of the most exciting times to fly fish the Bow River. From early spring Skwalas to the explosive Golden Stone hatch of late June and July, these big bugs can pull serious trout into shallow, bank-side feeding lanes. This guide breaks down the full season, stonefly life cycle, productive water, fly selection, rigging, timing, and the small adjustments that can turn a slow day into a memorable one.