Mills River Near Mills River
Mills River · Appalachia · USGS gage 03446000
Trout (marginal) (summer mean 19.9°C — trout, warm in summer).
Water
70°F
Flow
59 cfs
Air
64°F
Sky
0%
Pressure
29.97 in
Wind
4 mph
Predicted hatches · 2026-07-31
PredictedSlate Drake / IsonychiaIsonychia spp.0.93
Predicted by conditions; no reports yet. water 21.2°C (70°F) is cooling past the prime band (16-21°C); peak season; 8 days sustained ≥14°C; watch afternoon/evening; nymphs crawl to shore to emerge.
flies: Isonychia #10-12, Slate Drake, Leadwing Coachman
PredictedHexagenia (Hex)Hexagenia limbata0.55
Predicted by conditions; no reports yet. water 21.2°C (70°F) sits in the prime band (19-23°C); shoulder of the season; 8 days sustained ≥18°C; bright moon — night activity; watch after dark — the famous night hatch.
flies: Hex Dun #4-8, Hex Nymph, Hex Spinner
PredictedHopper / TerrestrialsAcrididae (grasshoppers)0.50
Predicted by conditions; no reports yet. water 21.2°C (70°F) sits in the prime band (17-24°C); shoulder of the season; 8 days sustained ≥14°C; watch warm, breezy afternoons.
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper
PredictedTricoTricorythodes spp.0.47
Predicted by conditions; no reports yet. water 21.2°C (70°F) is cooling past the prime band (16-21°C); shoulder of the season; 8 days sustained ≥15°C; watch early morning spinner falls.
flies: Trico Spinner #20-24, CDC Trico, Griffith's Gnat
PredictedLight CahillStenacron / Stenonema0.30
water 21.2°C (70°F) is cooling past the prime band (16-20°C); shoulder of the season; 8 days sustained ≥15°C; watch dusk.
flies: Light Cahill #14-16, Cream Cahill, Cahill Spinner
PredictedSpotted / Summer CaddisHydropsyche spp.0.27
water 21.2°C (70°F) is cooling past 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
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.