Mongaup River Below Swinging Bridge Reservoir
Mongaup River · Northeast · USGS gage 01433005
Trout (marginal) (summer mean 19.7°C — trout, warm in summer).
Water
56°F
Flow
127 cfs
Air
58°F
Sky
68%
Pressure
30.05 in
Wind
11 mph
Predicted hatches · 2026-10-30
PredictedBlue-Winged OliveBaetis spp.0.27
water 13.3°C (56°F) is cooling past the prime band (6-11°C); peak 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
PredictedMidgeChironomidae0.23
water 13.3°C (56°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.