Spring Creek · Mixed · Idaho

Teton River

Teton River venue image

The upper Teton, up in the valley under the back side of the Tetons, is a spring-fed meadow river — slow, weedy, clear, and technical, with native Yellowstone cutthroat and rainbows that tip up to mayflies and refuse anything clumsy.

Marginal · Rainbow Trout
Green Drake · 10-12
Marginallive now
Slow going — pick your moments
River steady at a fishable height. Slow going — pick your moments and do not force it.
80% confidence
What moved it
  • Level0.79 mLast reading 22h ago
  • Water temp18.5°C
  • ClarityClear
Today's fly
Green Drake
Green Drake10-12
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.79 m
Last reading 22h ago
Water temp18.5°C
ClarityClear
Weather19°C
WindS 4 km/h
Pressure1016 hPa
Rain · recent0.1 mm
Rain · ahead0.0 mm

Live readings — water temperature is an estimate where the gauge does not record it.

Water temperature for Rainbow Trout
Warm — slow
19°C est.ideal 10–18°C
0°14°28°
How to fish it · for Rainbow Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Western Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Pale Morning DunHatch
2
3
3
2
TricoHatch
2
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Rainbow Trout fly box
Permits & access
Permit required — see local rules.
  • Idaho licence
  • Native cutthroat conservation rules apply — check Idaho Fish & Game
  • Approach the clear meadow water carefully.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The upper Teton, up in the valley under the back side of the Tetons, is a spring-fed meadow river — slow, weedy, clear, and technical, with native Yellowstone cutthroat and rainbows that tip up to mayflies and refuse anything clumsy. It's quiet, gorgeous water that asks for a careful approach and a long leader. Below the valley the river drops into a canyon and turns into a different, brawnier animal. The green drake hatch up top is the event people plan around, and it's worth planning around.

  • Mixed
Water quality · US Clean Water Act
  • Aquatic life: Impaired
What this classification means

EPA ATTAINS assessment unit 'Teton River' (ID17040204SK017_04), 2022 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Temperature, Sediment, Habitat Alterations. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.

Status is for the Clean Water Act assessment unit covering this reach.

EPA ATTAINS (Clean Water Act) · ID17040204SK017_04

The full read · show the working · for Rainbow Trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature84 × 28%23.5
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time45 × 13%5.9
Pressure75 × 7%5.3
Insect activity62 × 12%7.4
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • TroutSaturday of Memorial Day weekend → 30 November
Related guides
Euro Nymphingsubsurface methods
Booking & contacts