Green River tailwater browns and steelhead-style fall pattern take shape

What's biting

What's next

Expect temperatures to hold in the upper 40s through the next few days, so the best fishing should come in the warmest part of the afternoon rather than at first light. With flow at 4,200 cfs on one gauge, the fish should stack in softer seams and along the edges of the current. Plan to get a heavier nymph rig down to the bottom there.

On the lower flow near 2,170 cfs, a lighter presentation should work better. MidCurrent's recent Tying Tuesday lineup highlights beaded purple nymphs for low-light, overcast days, and a spare midge-style pattern for clear, pressured tailrace water. Both fit the conditions here. Per Caddis Fly (OR), the Perdigon is a hot fly this fall, and its streamlined, heavy profile suits fast water.

The First Quarter moon puts decent light on the evening hours, so a late-day session after the afternoon warm-up is worth planning. Streamer anglers can try a jigged sculpin style pattern, which Caddis Fly (OR) describes as imitating a large part of big trout's diet.

Context

Late October is typically the transition from the late-summer pattern to the fall and pre-winter phase in this part of the Rockies. Brown trout generally become more aggressive and move toward spawning behavior in autumn, and tailwater flows from the dam tend to keep temperatures steadier than freestone streams. Water temps in the upper 40s are on schedule for the season. Check state regulations and any seasonal closures before targeting spawning fish, and avoid wading over redds.