Fly Fishing Blue River - Below Green Mountain

Overview

Below Green Mountain Reservoir, the Blue River runs through a canyon before continuing toward the Colorado River. Reservoir releases shape the pocket water, riffles and deep pools that hold brown and rainbow trout. Nymphs probe deeper seams and undercut banks, while soft hackles can swing through the edges of pockets. Steep banks and changing depths make a carefully chosen fishing position useful here.

Seasonal Presentations

Spring brings prolific stonefly and caddis hatches in the riffles near mid-canyon narrows, drawing trout into mid-river seams. Dry-dropper setups can also be effective when surface‐skimming caddis emerge in late spring. In summer, tiny mayflies and midges hatch in the early hours, offering opportunities when trout rise in shallow runs. Hopper and terrestrial action is minimal here; instead, focus on tight-line nymphing under clear currents or swinging soft hackles through the seams of deep pockets.

Fall brings sporadic midge and late-season mayfly activity beneath changing foliage. Winter presentations often focus on small nymphs in slower seams, where bank ice and changing releases affect the available water.