Green River tailwater stays fishable as fall cools the water
The Green River tailwater is running cool and steady this week. USGS gauge 09261000 reads 2,820 cfs with water at 55°F, while gauge 09234500 shows 2,310 cfs at 50°F and gauge 404417108524900 reads 55°F. That temperature spread of five degrees between sites is worth noting when choosing where to start. Fall hatches are the story elsewhere in the West: Caddis Fly (OR) describes afternoon and evening emergences of Blue Winged Olives and small caddis, and Reno Fly Shop (NV) points to small bugs and midges as the focus on the Truckee. Those are other waters, but the same cooling trend applies here.
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Expect the cooler 50°F reading to hold the bite steadier through midday, while the 55°F stretches warm a little by afternoon. With flows steady at these levels, plan for the best window in the late afternoon into early evening, when small mayfly and midge activity typically peaks in October.
Small, low-profile flies are the safer bet. Reno Fly Shop (NV) lists Blue Winged Olive and midge patterns such as the BH Zebra Midge and Griffith Gnat for fall conditions, and Caddis Fly (OR) calls the Perdigon a hot fly this fall. Those suggestions carry over to clear, pressured tailwater. Per MidCurrent, a spare midge-style pattern excels in the clear water of stillwaters and tailraces.
The waxing gibbous moon means more light at night and a brighter early evening, so expect fish to stay a bit more cautious at dusk. Overcast days should improve the surface bite.
Context
Late October is typically the shoulder of the season on a tailwater like this. Water has cooled out of summer ranges, trout feed on small insects through the warmest part of the day, and the crowds have thinned. Flow changes from dam releases can shift conditions quickly, so check the gauges before you go and again when you arrive. Regulations and any seasonal closures vary, so check state regs before keeping fish.
Synthesized from real-time NOAA buoy data, USGS stream gauges, and current reports across regional fishing blogs, captain updates, and angler forums. Check local regulations before keeping fish. Never trust a single source for a trip decision.
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