Trinity River at Lewiston
Trinity River · Sierra / West · USGS gage 11525500
Coldwater (summer mean 11.1°C — prime coldwater).
Water
51°F
Flow
1,410 cfs
Air
98°F
Sky
0%
Predicted hatches · 2026-06-16
PredictedGreen DrakeDrunella spp.0.60
Predicted by conditions; no reports yet. water 10.6°C (51°F) is warming toward the prime band (11-15°C); peak season; 3 days sustained ≥10°C; watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PredictedMidgeChironomidae0.45
Predicted by conditions; no reports yet. water 10.6°C (51°F) is cooling past the prime band (1-10°C); shoulder of the season; 8 days sustained ≥0°C; watch midday, especially cold months.
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.