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Hatch predictions for 300+ US rivers — built from live water & weather, then confirmed against real fly-shop reports.

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Nf Skokomish River below Staircase Rpds near Hoodsport

Nf Skokomish River · Pacific NW · USGS gage 12056500

Coldwater (summer mean 12.3°C — prime coldwater).

Water
55°F
Flow
37 cfs
Air
62°F
Sky
100%
Pressure
30.21 in
Wind
3 mph
Predicted hatches · 2026-08-03
PredictedMidgeChironomidae0.26
water 12.8°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
PredictedPale Morning DunEphemerella spp.0.23
water 12.8°C (55°F) is warming toward the prime band (13-18°C); shoulder of the season; watch late morning to early afternoon.
flies: PMD Comparadun #16-18, Sparkle Dun, Pheasant Tail #16
PredictedSpotted / Summer CaddisHydropsyche spp.0.23
water 12.8°C (55°F) is warming toward the prime band (14-19°C); peak season; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis

PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.