Madison River below Ennis Lake
Madison River · Montana · USGS gage 06041000
Lower Madison below Ennis Lake near McAllister (top of Beartrap Canyon). Warmer than the upper river; strong caddis and stonefly life.
Water
59°F
Flow
1,140 cfs
Air
60°F
Sky
96%
Pressure
30.01 in
Wind
11 mph
Predicted hatches · 2026-09-14
ConfirmedSpotted / Summer CaddisHydropsyche spp.0.62
Model says likely and 1 recent report confirm it. water 15.1°C (59°F) sits in 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
ReportedHopper / TerrestrialsAcrididae (grasshoppers)0.46
2 reports say it's happening, though conditions are lukewarm. water 15.1°C (59°F) is warming toward the prime band (17-24°C); shoulder of the season; 8 days sustained ≥14°C; wind puts terrestrials in play; watch warm, breezy afternoons.
reports: Rising Trout Outfitters — Lower Madison Report, Yellow Dog Flyfishing — Lower Madison Reports
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper
PredictedSlate Drake / IsonychiaIsonychia spp.0.55
Predicted by conditions; no reports yet. water 15.1°C (59°F) is warming toward 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
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.