Rules at a glance
- Free fishing
- Fly only
Water temperature for Brown Trout
Warm — slow18.0°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 18°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
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- Satin sedgeMost likelyLower confidence#12–14 · Egg-layingSkitter it at dusk — this one's fished, not dead-drifted.
- Net-spinning caddis (S. Europe)Also possibleLower confidence#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
Hatch timeline · todayPeak at 6pm
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 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
Water here at 18.0°C. Nothing cooler within range.
The full read · show the working · for Brown Trout · confidence 80%
How the 40 is built — score × weight = contribution
Temperature56 × 28%15.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Conditions total= 70
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.
The dawn and dusk windows score higher than the midday lull.
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
Warm — slow18.0°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 18°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
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
- Satin sedgeMost likelyLower confidence#12–14 · Egg-layingSkitter it at dusk — this one's fished, not dead-drifted.
- Net-spinning caddis (S. Europe)Also possibleLower confidence#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
Hatch timeline · todayPeak at 6pm
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 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
Water here at 18.0°C. Nothing cooler within range.
The full read · show the working · for Brown Trout · confidence 80%
How the 40 is built — score × weight = contribution
Temperature56 × 28%15.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Conditions total= 70
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.
The dawn and dusk windows score higher than the midday lull.
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