Mayflies
Stoneflies
Caddisflies
Damselflies & dragonflies
Gammarids
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
Rules at a glance
- Permit required
Water temperature for Brown Trout
Ideal14°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
- Large sedgesMost likelyNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Damselflies & dragonflies
Hatch timeline · todayPeak at 2pm
12pm(now) — Reed Smut
Stage: On emergersApproach: Emerger or dryActivity: 46%
Also:Autumn Dun35%Cinnamon Sedge30%Heather Fly21%
Peak emergence window10 food groups active
Peak activity at 2pm — Autumn Dun (Autumn Dun, 12 food groups active)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
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 · September 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
Brown Trout fly box
A compact but high-quality Swiss box covering alpine streams, mountain lakes, and Jura salmonid rivers such as the Doubs.
Permits & access
Permit required — see local rules.
- Valais Alpine headwaters
- Patent (Valais) + fishing permit required
- Remote access.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Gallery · 2
Terrain map
About this water
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity40 × 18%7.2
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity39 × 12%4.7
Conditions total= 69
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
Upper Rhône in Valais flowing from the Rhône glacier, glacially-influenced water turning milky in peak summer melt.
Water temperature for Brown Trout
Ideal14°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
- Large sedgesMost likelyNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Damselflies & dragonflies
Hatch timeline · todayPeak at 2pm
12pm(now) — Reed Smut
Stage: On emergersApproach: Emerger or dryActivity: 46%
Also:Autumn Dun35%Cinnamon Sedge30%Heather Fly21%
Peak emergence window10 food groups active
Peak activity at 2pm — Autumn Dun (Autumn Dun, 12 food groups active)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
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 · September 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
Brown Trout fly box
A compact but high-quality Swiss box covering alpine streams, mountain lakes, and Jura salmonid rivers such as the Doubs.
Permits & access
Permit required — see local rules.
- Valais Alpine headwaters
- Patent (Valais) + fishing permit required
- Remote access.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Gallery · 2
Terrain map
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 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity40 × 18%7.2
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity39 × 12%4.7
Conditions total= 69
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