Green River tailwater trout settle into a steady fall pattern

What's biting

What's next

With a new moon, the nights will be dark and the bite should hold steady through the day rather than fading hard at midday. Expect the best action when the light is low, early and late, when olives and midges hatch and fish move up in the water column.

Flows at this level are fairly high and steady, which favors drifting nymphs under an indicator or tight-line rigs. Per Trout Unlimited, weight matters on a nymph rig, so add or remove split shot until the flies tick bottom without hanging up. Caddis Fly (OR) notes the Perdigon is a hot fly this fall, a compact, heavy pattern that sinks quickly in the current. Terrestrials like ants may still draw a look on warm afternoons, per the same shop.

If temperatures keep cooling over the next few days, expect fish to stack in softer seams and slower tailouts, and Brown Trout to become more aggressive as fall progresses. Check gauge readings before you go, since release changes can shift the whole river quickly.

Context

Mid-October is typically a transition period on a Utah tailwater. Cooling air temperatures keep the water in the productive range, hatches shift toward small mayflies and midges, and Brown Trout begin moving toward spawning behavior, so they typically become more territorial and more willing to chase a streamer. Anglers should check state regulations and give spawning fish and redds plenty of room. This is generally a rewarding time of year, with lighter crowds than summer and consistent fish.