Freestone · Granite · Alpes-Maritimes / Italy border, FR

Roya

Roya — The Alien - Roya Valley - D6204/E74 road - Alpes-Maritimes - France
Poor · Brown Trout
Hare's Ear Nymph · 14-16
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Arc
  • Water temp14.6°C
  • ClarityClear
Today's fly
Hare's Ear Nymph
Hare's Ear Nymph14-16
Upstream
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Arc
Water temp14.6°C
ClarityClear
Weather20°C
WindSE 7 km/h
Pressure1025 hPa
Rain · recent0.0 mm
Rain · ahead0.1 mm

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

Water temperature for Brown Trout
Ideal
15°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open trout season — the Roya runs from the Italian border down to the Mediterranean. Spring through summer evenings; autumn small flies.
Where
Pool tails and pocket water through the Mercantour-bordering valley. Maritime-Alps freestone — clear water, fast pockets.
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.
Likely species
Stoneflies
Caddisflies
Hatch timeline · todayPeak at 14 Uhr

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Supporters see the full sub-surface read.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

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Evidence
Survey-backed · regionalHigh confidence

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

Through the year
0–3 scale · October 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
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
  • AAPPMA Alpes-Maritimes
  • Cross-border river — French carte on the French side; Italian permit required below the border at Ventimiglia.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Vésubie
22 km
0
Brown trout
Tinée
37 km
0
Brown trout
Gallery · 2
  1. Roya — The Alien - Roya Valley - D6204/E74 road - Alpes-Maritimes - France
    The Alien - Roya Valley - D6204/E74 road - Alpes-Maritimes - France
  2. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
What this classification means

WFD ecological status Moderate → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRDR74 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRDR74

The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity76 × 12%9.1
Conditions total= 86
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Arcproxy
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2. Saturday im March → 3. Sunday im September
Related guides
Pyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
Booking & contacts