San Juan River Fly Fishing Report - November 1, 2026

Fly Fishing Report

SAN JUAN RIVER

Report
NOV 1 — 8, 2026
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Flow
221CFS
SAN JUAN RIVER NEAR ARCHULETA, NM
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Water Temp
52.3°F
Updated 2026-10-31
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Weather
42–58°F
Rain Showers
💧
Clarity
Clear
Check post-storm
Flow is running at 221 cfs and water temperature is 52.3°F — low, clear, and prime for technical nymphing, but a significant rain event is rolling in today with 100% precipitation chance and potential for rising, off-color water by afternoon.
Hatch Chart
Insect Size Activity Prime Time
Midge (Black/Chocolate) 22-24 Heavy 10 AM - 1 PM
Blue-Winged Olive 20-22 Heavy 11 AM - 2 PM
Midge Cluster 20-22 Moderate 9 AM - 12 PM
Baetis Nymph 20-22 Moderate 8 AM - 11 AM
Caddis (Larva/Pupa) 18-20 Light 12 PM - 3 PM
Best Time Window
  • 7 AM - 10 AM: Pre-rain nymphing in the flats with midge and baetis patterns before precipitation intensifies.
  • 10 AM - 12 PM: Prime BWO and midge hatch window — overcast skies will push dry-fly and emerger activity; work the slow seams.
  • 12 PM - 2 PM: Storm window — if rain is heavy, move near the dam and probe deeper runs with streamers and anchor nymphs.
Guide's Tip
From the benchGet on the water early — this morning's window before the rain intensifies is your best shot at technical dry-fly and nymph fishing in clear conditions. Focus on the flats and slow seams with size 22-24 midge and BWO patterns on 6X tippet, keeping your indicator set at 18-24 inches above the fly to match the low 221 cfs flows. As the storm builds through mid-morning and the sky goes fully overcast, expect the BWO hatch to fire hard — that cloud cover is your friend. If the river starts to color up by afternoon from runoff, move up close to the dam where the water stays clearest longest and switch to the Sparkle Minnow or Frenchie to find fish that have gone off the surface.
Main Species
Rainbow Trout
Brown Trout
Report generated November 1, 2026 — Next update: November 8, 2026