Ruby River Near Twin Bridges
Ruby River · Rockies · USGS gage 06023000
Trout (marginal) (summer mean 18.6°C — trout, warm in summer).
Water
73°F
Flow
45 cfs
Air
82°F
Sky
2%
Predicted hatches · 2026-06-16
PredictedHexagenia (Hex)Hexagenia limbata0.60
Predicted by conditions; no reports yet. water 22.8°C (73°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
PredictedSlate Drake / IsonychiaIsonychia spp.0.20
water 22.8°C (73°F) is cooling past the prime band (16-21°C); shoulder of the season; 5 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.