San Juan River Near Archuleta
San Juan River · Rockies · USGS gage 09355500
Coldwater (summer mean 10.2°C — prime coldwater).
Water
48°F
Flow
875 cfs
Air
62°F
Sky
19%
Pressure
29.84 in
Wind
7 mph
Predicted hatches · 2026-09-15
ConfirmedMidgeChironomidae0.65
Model says likely and 3 recent reports confirm it. water 8.8°C (48°F) sits in the prime band (1-10°C); shoulder of the season; 7 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
PredictedBlue-Winged OliveBaetis spp.0.50
Predicted by conditions; no reports yet. water 8.8°C (48°F) sits in the prime band (6-11°C); shoulder of the season; 7 days sustained ≥4°C; watch midday, especially overcast afternoons.
flies: BWO Sparkle Dun #18-22, RS2, Pheasant Tail #18
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.