Rules at a glance
- Permit required
Water temperature for Brown Trout
Cool — slow8°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.
Likely species
Mayflies
Stoneflies
Caddisflies
Caddisflies
Damselflies & dragonflies
Hatch timeline · tomorrowPeak at 11h
12h(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 95%
Also:Autumn Olive57%Black Midge48%
Peak emergence windowWeather boost8 food groups active
Peak activity at 11h — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Supporters see what else is on the menu.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
1
Autumn DunHatch
2
3
2
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Brown Trout
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
Gallery · 2
Terrain map
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature78 × 28%21.8
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity66 × 12%7.9
Conditions total= 78
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout June → 30 September
Related guides
Booking & contacts
Rhône Headwaters
Water temperature for Brown Trout
Cool — slow8°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.
Likely species
Caddisflies
Hatch timeline · tomorrowPeak at 11h
12h(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 95%
Also:Autumn Olive57%Black Midge48%
Peak emergence windowWeather boost8 food groups active
Peak activity at 11h — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Supporters see what else is on the menu.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
1
Autumn DunHatch
2
3
2
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Brown Trout
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
Gallery · 2
Terrain map
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature78 × 28%21.8
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity66 × 12%7.9
Conditions total= 78
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout June → 30 September
Related guides
Booking & contacts