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© 2026 Barbless.co. Flow and gauge data from USGS; weather from Open-Meteo. · v2026.10.18.2

  1. Idaho
  2. Rivers & Lakes
  3. Snake River, American Falls Reservoir to Gem Lake Dam

Updated September 19, 2026

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Idaho Rivers › Eastern Idaho

Snake River, American Falls Reservoir to Gem Lake Dam

Premier Idaho trout water with diverse seasonal hatches.

Recommended water59 mi · 95 kmFreestone RiverMixed warm-water
View on MapGet Directions
Rainbow troutBrown troutCutthroat troutSmallmouth bassLargemouth bass

A Legendary Idaho Fishery

Snake mainstem from American Falls Reservoir upstream to Gem Lake Dam (~57 mi) in Bannock and Bingham Counties. Heavily stocked rainbow and brown trout fishery with special rules (6 trout, only 2 cutthroat; bass limit 2).

Sources: idfg.idaho.gov

Best Season

May – October

River Type

Freestone

Skill Level

Beginner – Intermediate

Best Techniques

Dry Flies, Nymphing

Access

Moderate

Gauge stations along the Snake River, American Falls Reservoir to Gem Lake Dam

Around Blackfoot, part 1

Main stretch

Around Blackfoot, part 2

More stations on the river

Access

Fish in Snake River, American Falls Reservoir to Gem Lake Dam

Explore fish species associated with the Snake River, American Falls Reservoir to Gem Lake Dam. Each profile includes identification tips, habitat notes, and practical fishing guidance for Idaho anglers.

Hatches on Snake River, American Falls Reservoir to Gem Lake Dam

Review seasonal insect hatches on the Snake River, American Falls Reservoir to Gem Lake Dam, including timing windows and fly pattern suggestions for Idaho fly fishing.

Regulations

Check current seasons, limits, and special rules for Snake River, American Falls Reservoir to Gem Lake Dam before you go. Regulations change, so always verify with IDFG.

View IDFG Regulations

Guides & Outfitters

Recent conditions on Snake River, American Falls Reservoir to Gem Lake Dam

The latest fishing conditions and hatch notes for Snake River, American Falls Reservoir to Gem Lake Dam. Older reports live in the Snake River, American Falls Reservoir to Gem Lake Dam report archive.

Videos on Snake River, American Falls Reservoir to Gem Lake Dam

These YouTube videos have been hand-curated by our team because we feel they best represent the Snake River, American Falls Reservoir to Gem Lake Dam fishery. Watch for river character, access context, and techniques that translate to your next Idaho trip.

Photos

Nearby Communities

  • Fort Hall5.3 mi
  • Pingree5.4 mi
  • Gibson7 mi
  • Springfield7.5 mi
  • Tyhee7.8 mi
  • Liberty8.2 mi

On this page

Overview
Flows
Live camerasAccessFishHatchesRegulationsGuides & OutfittersVideosPhotosNearby CommunitiesReaches

River Tools

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Map data © Mapbox © OpenStreetMap

Fish in Snake River, American Falls Reservoir to Gem Lake Dam

The Snake River, American Falls Reservoir to Gem Lake Dam supports 5 fish species in our Idaho fishing catalog. Browse each profile for identification tips, seasonal patterns, and how these species are managed on this water.

  • Brown Trout
    Brown TroutWary, hard-fighting trout that reward careful presentations and can grow into true fish-eaters.
  • Cutthroat Trout
    Cutthroat TroutIdaho’s native trout, built for cold streams and lakes and famous for rising to a well-drifted fly.
  • Largemouth Bass
    Largemouth BassA warmwater predator that thrives around shallow cover and hits hardest in low-light periods.
  • Rainbow Trout
    Rainbow TroutIdaho’s most widespread trout, quick to rise and willing to chase nymphs and small streamers.
  • Smallmouth Bass
    Smallmouth BassAn introduced warmwater brawler that hammers lures around rock, current seams, and river structure.

Other reaches in the Snake River

8 reaches
  • Henrys Fork of the Snake River

    Trout fishery82 mi · 132 km
  • South Fork Snake River

    Trout fishery107 mi · 171 km
  • Snake River, Hells Canyon Dam to Clearwater Confluence (Lewiston)

    Steelhead & sturgeon107 mi · 172 km
  • Snake River, Idaho Falls to American Falls Reservoir

    Trout fishery80 mi · 129 km
  • Snake River, Lower Salmon Falls Dam to Bliss Dam (Hagerman / Thousand Springs)

    Trout fishery22 mi · 35 km
  • Snake River, Milner Dam to Hansen Bridge (Murtaugh Canyon)

    Trout fishery23 mi · 38 km
  • Snake River, Osgood Diversion Dam to Henrys Fork

    Trout fishery47 mi · 76 km
  • Snake River, Swan Falls Dam to Brownlee Reservoir

    Bass & sturgeon45 mi · 73 km

Guides & Outfitters

Fishing guides, outfitters, shuttles, and shops that operate on the Snake River, American Falls Reservoir to Gem Lake Dam.

No verified providers for this river yet. Browse the full directory.

Videos on Snake River, American Falls Reservoir to Gem Lake Dam

These YouTube videos have been hand-curated by our team because we feel they best represent the Snake River, American Falls Reservoir to Gem Lake Dam fishery. Watch for river character, access context, and techniques that translate to your next Idaho trip.

No videos
No related videos yet.

Hatches on Snake River, American Falls Reservoir to Gem Lake Dam

The Snake River, American Falls Reservoir to Gem Lake Dam has 14 documented insect hatches across spring, summer, fall, and winter. Review seasonal timing and recommended fly patterns to plan productive days on this Idaho water.

Likely hatching

  • Blue-winged olives / Baetis
  • October caddis
  • Mahogany duns
  • Streamer bite

Recommended flies

  • BWO
  • October Caddis
  • Mahogany Dun
  • Streamer

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