Trail Creek At Ketchum
Trail Creek · Rockies · USGS gage 13137500
Coldwater (summer mean 13.6°C — prime coldwater).
Water
56°F
Flow
5 cfs
Air
45°F
Sky
0%
Pressure
30.00 in
Wind
4 mph
Predicted hatches · 2026-09-15
PredictedSpotted / Summer CaddisHydropsyche spp.0.35
Predicted by conditions; no reports yet. water 13.4°C (56°F) is warming toward the prime band (14-19°C); shoulder of the season; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedMidgeChironomidae0.22
water 13.4°C (56°F) is cooling past the prime band (1-10°C); shoulder of the season; 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.