Freestone · Granite · Alpes-Maritimes / Mercantour

Vésubie

Vésubie venue image
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The Vésubie is a short, steep Mercantour river that rises at the Col de Fenestre on the Italian border and runs south through Saint-Martin-Vésubie, Roquebillière and Lantosque before joining the Var.

Marginal · Brown Trout
Small Perdigón · 16-20
Marginallive now
Slow going — pick your moments
River high but settled. Take your time — read the water before you cast.
80% confidence
What moved it
  • LevelProxyvia Arc (Bessans reach)
  • Water temp18.5°C
  • ClarityClear
Today’s fly
Small Perdigón
Small Perdigón16-20
Euro-nymph
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Arc (Bessans reach)
Water temp18.5°C
ClarityClear
Weather19°C
WindNE 4 km/h
Pressure1017 hPa
Rain · recent0.0 mm
Rain · ahead2.6 mm

No gauge on this water — conditions are inferred from Arc (Bessans reach). The trend transfers, the absolute level does not.

Water temperature for brown trout
Warm — slow
19°C est.ideal 1016°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.
Why this works
⚠️ Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Alpine RhithrogenaHatch
2
3
3
2
Sculpin / Baitfish (Rivers)Hatch
2
3
3
3
3
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
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
Permits & access
Permit required — see local rules.
  • AAPPMA Alpes-Maritimes
  • Storm Alex reconstruction ongoing — check access and parcours availability before travelling.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 19°C — probably warm enough to stress brown trout. These are likely cooler.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The Vésubie is a short, steep Mercantour river that rises at the Col de Fenestre on the Italian border and runs south through Saint-Martin-Vésubie, Roquebillière and Lantosque before joining the Var. It is the kind of high alpine trout water that looks like it should be somewhere much further north than Provence — pines, cold water, granite boulders, wild brown trout in the clean pockets. Storm Alex in October 2020 hit the Vésubie valley harder than anywhere else in the Mercantour. Saint-Martin-Vésubie, Roquebillière and the hamlets along the river were devastated; dozens of people died across the Tinée, Vésubie and Roya valleys that night; the reconstruction is still going on more than five years later. The river itself has largely recovered hydrologically, though some reaches were entirely rebuilt, and the trout populations have begun to come back. Fish the Vésubie with a sense of proportion. It is still beautiful and it is still productive, but the people who live in the valley have been through something most of us have not, and a bit of respect for that goes a long way. Late May onwards, short rod, careful wading. The best fishing is above Saint-Martin-Vésubie in the headwater valleys.

  • Granite
Water quality (WFD)
  • EcologyGood
  • ChemicalUnknown

WFD classification · FRDR80

The full read · show the working · for brown trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature47 × 28%13.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity62 × 12%7.4
Conditions total= 66
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Arc (Bessans reach)proxy
Prey activitysurvey-backed invertebrate datasurvey
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
  • Trout2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts