Green River tailwater cools into its fall rhythm below Flaming Gorge
USGS gauge 09234500, in the tailwater immediately below Flaming Gorge Dam, is reading 2,820 cfs and 50°F as of this afternoon, the coldest number in the system and the clearest sign of a steady, bottom-release dam flow. Ten miles downstream, USGS gauge 09261000 shows the river already warmed to 60°F on a lighter 2,290 cfs, and a third site nearby is holding at 58°F. That ten-degree spread between the dam and the water below it is the defining feature of this fishery right now.
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Expect the pattern at the dam to hold through the week. Flaming Gorge's winter flow management tends to lock releases into a narrow band through October, so the near-50°F water right at the tailwater should stay close to where it sits today rather than swing with air temperature. Farther downstream, the warmer stretches should keep easing toward the cold end of that range as nights lengthen under this waning crescent moon heading toward new moon, low light that favors early and late sessions over the next few days. Plan around the cooler morning hours up near the dam and look for the warmer afternoon water downstream to fish more actively as the gap between the two narrows heading into November.
Context
A roughly ten-degree gap between water released straight off Flaming Gorge Dam and water a few miles downstream is normal for this tailwater, the reservoir draws from depth, so the river below it runs colder and more stable than a free-flowing stream would at the same elevation in early October. That stability is what keeps this stretch fishable well past the point where most Utah freshwater slows down for the season. Flows in the high-2,000s to low-3,000s cfs line up with typical fall dam operations rather than a flood-control release or a drawdown, putting this week in the ordinary seasonal window for the tailwater.
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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