- Ecology: Moderate
- Chemical: Unknown
WFD classification · FRDR555A
Rules at a glance
- Day tickets
Water temperature for Brown Trout
Ideal15°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open trout season — once snowmelt drops. Mont Blanc-fed glacial influence means the Arve runs cold and clear once meltwater eases. Best from late June into autumn close.
Where
Pool tails and pocket water through the Haute-Savoie valley. Glacial-fed water reads cold and clear.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet. Move slowly, cast accurately.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Why this works
Good — water temperature is working for you, but water clarity is the limiting factor today.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
See what else is on the menu with Pro.
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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Arve Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 75%
How the 71 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity40 × 18%7.2
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity49 × 12%5.9
Conditions total= 72
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Giffreproxy
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 2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts
Arve
Water temperature for Brown Trout
Ideal15°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open trout season — once snowmelt drops. Mont Blanc-fed glacial influence means the Arve runs cold and clear once meltwater eases. Best from late June into autumn close.
Where
Pool tails and pocket water through the Haute-Savoie valley. Glacial-fed water reads cold and clear.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet. Move slowly, cast accurately.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Why this works
Good — water temperature is working for you, but water clarity is the limiting factor today.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
See what else is on the menu with Pro.
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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Arve Terrain map
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · FRDR555A
The full read · show the working · for Brown Trout · confidence 75%
How the 71 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity40 × 18%7.2
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity49 × 12%5.9
Conditions total= 72
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Giffreproxy
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 2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts