Madison River near Norris
Madison River · Montana · USGS gage 06041500
Lower Madison below Beartrap Canyon near Norris. Warmest Madison reach; watch summer temps.
Water
69°F
Flow
1,510 cfs
Air
80°F
Sky
13%
Predicted hatches · 2026-06-16
PredictedLight CahillStenacron / Stenonema0.87
Predicted by conditions; no reports yet. water 20.4°C (69°F) is cooling past the prime band (16-20°C); peak season; 5 days sustained ≥15°C; watch dusk.
flies: Light Cahill #14-16, Cream Cahill, Cahill Spinner
PredictedHexagenia (Hex)Hexagenia limbata0.60
Predicted by conditions; no reports yet. water 20.4°C (69°F) sits in the prime band (19-23°C); peak season; watch after dark — the famous night hatch.
flies: Hex Dun #4-8, Hex Nymph, Hex Spinner
PredictedSulphurEphemerella dorothea / invaria0.53
Predicted by conditions; no reports yet. water 20.4°C (69°F) is cooling past the prime band (15-19°C); peak season; 8 days sustained ≥13°C; watch evening, the last two hours of light.
flies: Sulphur Comparadun #16-18, Sulphur Spinner, Pheasant Tail
PredictedSlate Drake / IsonychiaIsonychia spp.0.50
Predicted by conditions; no reports yet. water 20.4°C (69°F) sits in 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
PredictedSpotted / Summer CaddisHydropsyche spp.0.27
water 20.4°C (69°F) is cooling past the prime band (14-19°C); shoulder of the season; 8 days sustained ≥12°C; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedGolden StoneHesperoperla / Calineuria0.20
water 20.4°C (69°F) is cooling past the prime band (14-18°C); peak season; 8 days sustained ≥13°C; watch afternoon and evening.
flies: Chubby Chernobyl #8-10, Yellow Stimulator, Pat's Rubber Legs
PredictedEastern Green DrakeEphemera guttulata0.20
water 20.4°C (69°F) is cooling past the prime band (14-18°C); peak season; 8 days sustained ≥12°C; watch evening; the spinner (Coffin Fly) falls at dusk.
flies: Green Drake #8-10, Coffin Fly Spinner, Drake Emerger
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.