Rules at a glance
- Free fishing
- Fly only
Water temperature for Brown Trout
Welfare risk33.2°Cideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Spring and autumn keep the water honest. Summer afternoons turn the Dora Baltea milky with Mont Blanc and Monte Rosa snowmelt and the fish go off it — mornings hold up far better. The reserve runs 29 March to 14 October, closed Tuesdays and Fridays.
Where
Current seams over the sand-and-bedrock-sill bed, and the softer water tight against the bank where the flow eases. The Chambave-Verrayes reach has enough structure to hold fish along its full nine and a half kilometres.
Method
Barbless single hook, maximum three flies — nymph the seams, dry fly when things settle in the margins. Everything goes back regardless of size.
Kit
9 to 10 ft #4/5 for a bigger freestone river. Floating line, 12 ft leader to 5 lb fluoro.
Why this works
Water at 33.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Likely species
Mayflies
Mayflies- Blue-winged oliveMost likely#16–18 · DunDuns are up; a sherry spinner fall may follow.
- Large dark oliveAlso possible#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
Caddisflies
Caddisflies- Net-spinning caddis (S. Europe)Most likelyLower confidence#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Satin sedgeAlso possibleLower confidence#12–14 · Egg-layingSkitter it at dusk — this one's fished, not dead-drifted.
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.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
12-16 · Pattern
Upstream dry, on top
Permits & access
Permit required — see local rules.
- No-kill reserve — mandatory catch-and-release, barbless single hook, maximum three flies
- Daily no-kill permit required, purchased through the Consorzio Pesca Valle d'Aosta.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here at 33.2°C — too warm to fish Brown Trout safely. These are cooler.
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature0 × 28%0.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Limiting factor: Water temperature (33.2°C) is outside Brown Trout's preferred range (10–16°C)= 58
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 2026-03-29 → 2026-10-14
- Grayling 2026-03-29 → 2026-10-14
All grayling must be returned — retention is prohibited here.
- Marble trout 2026-03-29 → 2026-10-14
Related guides
Booking & contacts
Dora Baltea (No-Kill, Chambave-Verrayes)
Water temperature for Brown Trout
Welfare risk33.2°Cideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Spring and autumn keep the water honest. Summer afternoons turn the Dora Baltea milky with Mont Blanc and Monte Rosa snowmelt and the fish go off it — mornings hold up far better. The reserve runs 29 March to 14 October, closed Tuesdays and Fridays.
Where
Current seams over the sand-and-bedrock-sill bed, and the softer water tight against the bank where the flow eases. The Chambave-Verrayes reach has enough structure to hold fish along its full nine and a half kilometres.
Method
Barbless single hook, maximum three flies — nymph the seams, dry fly when things settle in the margins. Everything goes back regardless of size.
Kit
9 to 10 ft #4/5 for a bigger freestone river. Floating line, 12 ft leader to 5 lb fluoro.
Why this works
Water at 33.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Likely species
Mayflies
- Blue-winged oliveMost likely#16–18 · DunDuns are up; a sherry spinner fall may follow.
- Large dark oliveAlso possible#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
Caddisflies
- Net-spinning caddis (S. Europe)Most likelyLower confidence#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- Satin sedgeAlso possibleLower confidence#12–14 · Egg-layingSkitter it at dusk — this one's fished, not dead-drifted.
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.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
12-16 · Pattern
Upstream dry, on top
Permits & access
Permit required — see local rules.
- No-kill reserve — mandatory catch-and-release, barbless single hook, maximum three flies
- Daily no-kill permit required, purchased through the Consorzio Pesca Valle d'Aosta.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here at 33.2°C — too warm to fish Brown Trout safely. These are cooler.
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature0 × 28%0.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Limiting factor: Water temperature (33.2°C) is outside Brown Trout's preferred range (10–16°C)= 58
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 2026-03-29 → 2026-10-14
- Grayling 2026-03-29 → 2026-10-14
All grayling must be returned — retention is prohibited here.
- Marble trout 2026-03-29 → 2026-10-14
Related guides
Booking & contacts