Upper Rhône in Valais flowing from the Rhône glacier, glacially-influenced water turning milky in peak summer melt. Best in early season and autumn when the glacier calms. Wild brown trout in high alpine water.
- Granite
Water temperature for brown trout
Warm — slow17°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown 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
Very poor — river flow is working for you, but water clarity is the limiting factor today.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
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
Trout seasonSeason
1
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- Têtes de bassin alpines du Valais
- Patente (Valais) + permis de pêche requis
- Accès isolé.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
About this water
The full read · show the working · for brown trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow80 × 22%17.6
Clarity0 × 18%0.0
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity45 × 12%5.4
Limiting factor: Water is unfishable — too coloured for Brown Trout= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- TroutJune → 30 September
Related guides
Booking & contacts
Rhône Headwaters
Terrain map
Upper Rhône in Valais flowing from the Rhône glacier, glacially-influenced water turning milky in peak summer melt.
Water temperature for brown trout
Warm — slow17°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown 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
Very poor — river flow is working for you, but water clarity is the limiting factor today.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
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
Trout seasonSeason
1
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- Têtes de bassin alpines du Valais
- Patente (Valais) + permis de pêche requis
- Accès isolé.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
About this water
Upper Rhône in Valais flowing from the Rhône glacier, glacially-influenced water turning milky in peak summer melt. Best in early season and autumn when the glacier calms. Wild brown trout in high alpine water.
- Granite
The full read · show the working · for brown trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow80 × 22%17.6
Clarity0 × 18%0.0
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity45 × 12%5.4
Limiting factor: Water is unfishable — too coloured for Brown Trout= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- TroutJune → 30 September
Related guides
Booking & contacts