Missouri River below Holter Dam near Wolf Creek
Missouri River · Rockies · USGS gage 06066500
Trout (marginal) (summer mean 17.9°C — trout, warm in summer).
Water
51°F
Flow
2,700 cfs
Air
35°F
Sky
100%
Pressure
30.03 in
Wind
6 mph
Predicted hatches · 2026-10-30
ConfirmedBlue-Winged OliveBaetis spp.1.00
Model says likely and 1 recent report confirm it. water 10.6°C (51°F) sits in the prime band (6-11°C); peak season; 8 days sustained ≥4°C; overcast skies favor it; watch midday, especially overcast afternoons.
reports: Yellow Dog — Missouri River Reports
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
ConfirmedMidgeChironomidae0.59
Model says likely and 1 recent report confirm it. 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.
reports: Yellow Dog — Missouri River Reports
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.