Spate · Granite · Corsica / Corse-du-Sud (Ajaccio hinterland)

Gravona

Gravona venue image
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Mediterranean torrent flowing from central Corsican mountains to the west coast, steep, technical river where light bounces off white rock and the air carries salt.

Marginal · Brown Trout
CDC Emerger · 16-18
Marginallive now
Slow going — pick your moments
River steady at a fishable height. Take your time — read the water before you cast.
90% confidence
What moved it
  • Level0.61 mLast reading 6h ago
  • Water temp18.2°C
  • ClarityClear
Today’s fly
CDC Emerger
CDC Emerger16-18
Dead-drift
Conditions on the water
Live gauge
Level
Steady
0.61 m
Last reading 6h ago
Water temp18.2°C
ClarityClear
Weather21°C
WindE 4 km/h
Pressure1019 hPa
Rain · recent1.3 mm
Rain · ahead12.3 mm

Live readings — water temperature is an estimate where the gauge does not record it.

Water temperature for brown trout
Warm — slow
18°C est.ideal 10–16°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 18.2°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 8 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
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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.
  • Corse-du-Sud regulations
  • Carte de pêche required
  • No-kill development active.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 18°C — probably warm enough to stress brown trout. These are likely cooler.
Restonica
25 km
~18°C
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Mediterranean torrent flowing from central Corsican mountains to the west coast, steep, technical river where light bounces off white rock and the air carries salt. Tight, cascading pocket water requiring short-line nymphing and small dry flies. Endemic Corsican trout (macrostigma lineage) in cold, oxygenated flows. Clear water, conservative fish, ethics-heavy approach. No-kill conservation developing. Check Corse-du-Sud regulations.

  • Granite
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · FRER39

The full read · show the working · for brown trout · confidence 90%
How the 39 is built — score × weight = contribution
Temperature53 × 28%14.8
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 70
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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
Apple MapsGoogle Maps
Seasons & zones
  • Trout2nd Saturday of March → 3rd Sunday of September
Related guides
Pyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
Booking & contacts