Main Stem Snake River
MAIN STEM SNAKE RIVER
ReportOCT 28 — NOV 4, 2026
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Flow
1970CFS
SNAKE RIVER NR BLACKFOOT ID
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Water Temp
56.3°F
Updated 2026-10-27
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Weather
28–55°F
Partly Cloudy
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Reported By
Bruce Staples
On the water
The Snake River is running 1,970 cfs at the Blackfoot gauge (56.3°F) with low flows above the reservoir making wading widespread and safe; below American Falls Dam, flows are around 300 cfs, opening up additional wading access. Brown trout are actively migrating to spawning areas throughout the system, and tonight's low of 30°F will be followed by sunny skies Wednesday with a high near 50.
From the ShopBruce Staples · October 28, 2026
Widespread safe wading locations are present in the river above the reservoir because of the low flow. Brown trout are migrating to spawning areas throughout the river. Streamer and woolly bugger patterns on sink tip or full sinking lines with stout leaders are always the best producers. Evenings, early mornings, and stormy conditions are the best times to encounter them.
Flow below American Falls Dam is about 300 cfs, so wading there is now possible. Presenting streamer, woolly bugger, and large rubber leg patterns are best for encountering trout. Look for crowding directly below the dam, but fewer anglers at access sites downstream.
What's Working — Hot Flies
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Brown Trout Spawn (migration) | N/A | Peak — fish are moving to spawning areas throughout the river | Early morning, evening, and during stormy conditions |
| Midges | #20–24 | Low background activity typical for October | Midday when temps peak |
| Blue-Winged Olive (Baetis) | #18–22 | Possible on overcast or stormy afternoons | Afternoon into early evening |
Best Time Window
- EARLY MORNING (first light to 9 AM): Prime window for streamer and woolly bugger fishing to actively moving spawning browns — low light triggers aggressive strikes.
- EVENING (1 hour before sunset to dark): The other top window Madison calls out — swing big dark patterns through runs and seams as browns become most active.
- STORMY/OVERCAST CONDITIONS (any time of day): Cloudy skies and dropping pressure fire up brown trout throughout the day; don't wait for evening if a storm rolls through.
Guide's Tip
From the benchMadison notes that woolly bugger patterns are among the top producers right now — if you have your own in olive, black, or brown, bring them. Rig everything on a sink tip or full sinking line with a stout leader to get your fly into the strike zone quickly. Below American Falls Dam, skip the crowds right at the dam and walk to the downstream access sites for more elbow room and willing fish.
Main Species
Brown Trout
Rainbow Trout
Yellowstone Cutthroat Trout
