San Juan River Near Archuleta
San Juan River · Rockies · USGS gage 09355500
Coldwater (summer mean 10.2°C — prime coldwater).
Water
51°F
Flow
859 cfs
Air
80°F
Sky
0%
Pressure
29.71 in
Wind
4 mph
Predicted hatches · 2026-07-31
ConfirmedMidgeChironomidae0.61
Model says likely and 3 recent reports confirm it. water 10.7°C (51°F) is cooling past the prime band (1-10°C); shoulder of the season; 8 days sustained ≥0°C; watch midday, especially cold months.
reports: Abe's / San Juan River — Fishing Info & Report, Abe's / San Juan River — Fishing Info & Report, Abe's / San Juan River — Fishing Info & Report
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge
PredictedGreen DrakeDrunella spp.0.21
water 10.7°C (51°F) is warming toward the prime band (11-15°C); shoulder of the season; watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.