Upper Truckee River At South Lake Tahoe
Upper Truckee River · Sierra / West · USGS gage 10336610
Trout (marginal) (summer mean 17.8°C — trout, warm in summer).
Water
55°F
Flow
4 cfs
Air
52°F
Sky
79%
Pressure
29.80 in
Wind
4 mph
Predicted hatches · 2026-09-15
PredictedSpotted / Summer CaddisHydropsyche spp.0.25
water 13.0°C (55°F) is warming toward the prime band (14-19°C); shoulder of the season; 8 days sustained ≥12°C; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedMidgeChironomidae0.25
water 13.0°C (55°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
PredictedBlue-Winged OliveBaetis spp.0.19
water 13.0°C (55°F) is cooling past the prime band (6-11°C); shoulder of the season; 8 days sustained ≥4°C; overcast skies favor it; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.