Spate · Granite · Brittany / Morbihan

Scorff

Photo of Scorff
Contributor photo

Scorff — image via Wikipedia (Scorff)

Personnel <CC BY-SA 3.0>, via Wikimedia Commons

Atlantic salmon river on granitic Armorican bedrock in southern Brittany.

Poor · Brown Trout
CDC Emerger · 16-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
80% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp21.0°C
  • ClarityClear
Today’s fly
CDC Emerger
CDC Emerger16-18
Dead-drift
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp21.0°C
ClarityClear
Weather20°C
WindNE 9 km/h
Pressure1017 hPa
Rain · recent1.4 mm
Rain · ahead24.8 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
21°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the open trout season — 2nd Saturday of March through 3rd Sunday of September. Spring olives April through May; sedges through summer; spate-driven on falling water.
Where
Pool tails, riffle heads, and the seams behind boulders through the Morbihan beats. The Scorff is medium-scale Breton spate freestone.
Method
Upstream dry to risers; dry-dropper through the riffles. Breton spate freestone — fish 12 to 24 hours after rain on the drop. Long leader, fine tippet.
Kit
9 ft #4 — Breton spate freestone. Floating line, 12 ft leader to 4 lb fluoro. Studded boots.
Why this works
⚠️ Water at 21°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.
Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
Salmon runRun
1
2
2
2
2
2
1
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.
  • Breton AAPPMA permits
  • Mandatory catch-and-release for salmon common.
What's coming
Plan ahead
5-day outlook
Water here around 21°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Photo of Scorff
    Scorff — image via Wikipedia (Scorff)
  2. Terrain map of the venue
    Terrain map
About this water

Atlantic salmon river on granitic Armorican bedrock in southern Brittany. Spring salmon runs March–May peak. Fish rising water after Atlantic rainfall when fresh flow brings fish upstream. Clear water between spates thanks to granite drainage. Standard tactics: tubes 1–1.5 inch in flood, dries as water drops. Sea trout present. Check Morbihan arrêté for season and regulations.

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

WFD classification · FRGR0094

The full read · show the working · for brown trout · confidence 80%
How the 21 is built — score × weight = contribution
Temperature14 × 28%3.9
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity39 × 12%4.7
Limiting factor: Water temperature (21°C) is outside Brown Trout's preferred range (10–16°C)= 50
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
  • Salmon1 March → 15 September
  • Trout2nd Saturday of March → 3rd Sunday of September

Salmon: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Sea trout: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Related guides
Pyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
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