Shields River below Sf Shields River near Wilsall
Shields River · Rockies · USGS gage 06192978
Coldwater (summer mean 12.2°C — prime coldwater).
Water
44°F
Flow
17 cfs
Air
39°F
Sky
0%
Pressure
30.11 in
Wind
3 mph
Predicted hatches · 2026-09-15
PredictedBlue-Winged OliveBaetis spp.0.50
Predicted by conditions; no reports yet. water 6.9°C (44°F) sits in the prime band (6-11°C); shoulder of the season; 7 days sustained ≥4°C; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PredictedMidgeChironomidae0.50
Predicted by conditions; no reports yet. water 6.9°C (44°F) sits in the prime band (1-10°C); shoulder of the season; 7 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.