Sauk River At Darrington
Sauk River · Pacific NW · USGS gage 12187500
Coldwater (summer mean 15.7°C — prime coldwater).
Water
60°F
Flow
463 cfs
Air
61°F
Sky
77%
Pressure
30.21 in
Wind
1 mph
Predicted hatches · 2026-08-03
PredictedSpotted / Summer CaddisHydropsyche spp.0.96
Predicted by conditions; no reports yet. water 15.6°C (60°F) sits in the prime band (14-19°C); peak season; 8 days sustained ≥12°C; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedHopper / TerrestrialsAcrididae (grasshoppers)0.51
Predicted by conditions; no reports yet. water 15.6°C (60°F) is warming toward the prime band (17-24°C); peak season; 8 days sustained ≥14°C; watch warm, breezy afternoons.
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper
PredictedPale Morning DunEphemerella spp.0.48
Predicted by conditions; no reports yet. water 15.6°C (60°F) sits in the prime band (13-18°C); shoulder of the season; 8 days sustained ≥12°C; watch late morning to early afternoon.
flies: PMD Comparadun #16-18, Sparkle Dun, Pheasant Tail #16
PredictedSlate Drake / IsonychiaIsonychia spp.0.38
Predicted by conditions; no reports yet. water 15.6°C (60°F) is warming toward the prime band (16-21°C); shoulder of the season; 8 days sustained ≥14°C; watch afternoon/evening; nymphs crawl to shore to emerge.
flies: Isonychia #10-12, Slate Drake, Leadwing Coachman
PredictedTricoTricorythodes spp.0.35
water 15.6°C (60°F) is warming toward the prime band (16-21°C); peak season; watch early morning spinner falls.
flies: Trico Spinner #20-24, CDC Trico, Griffith's Gnat
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.