Freestone · Granite · Normandy / Manche (post-dam-removal)

Sélune

Sélune — Ducey LaManche France Old-Bridge-over-Selune-River-02
Contributor photo

Ducey LaManche France Old-Bridge-over-Selune-River-02

CEphoto, Uwe Aranas (https://commons.wikimedia.org/wiki/User:Cccefalon) - CC BY-SA

The Sélune is the most important river restoration project in European history.

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.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.8°C
  • ClarityClear
Today’s fly
CDC Emerger
CDC Emerger16-18
Dead-drift
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.8°C
ClarityClear
Weather28°C
WindNE 21 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead12.0 mm

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

Water temperature for brown trout
Warm — slow
23°C est.ideal 1016°C
0°14°28°
How to fish it · for brown trout
When
Through the open trout season. Spring olives April through May; sedges through summer; small dark flies into late September.
Where
Normandy character — pool tails, weeded glides, the cushion behind alder roots. The Sélune flows through small intimate water.
Method
Upstream dry to spotted rising fish; long leader, fine tippet. Move slowly, cast accurately. The Sélune is small water and rewards careful approach.
Kit
9 ft #4 — Normandy default. Floating line, 14 ft leader to 4 lb fluoro. Polarising glasses non-negotiable.
Why this works
⛔ Water at 22.8°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
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
1
Sea trout runRun
1
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
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
Permits & access
Permit required — see local rules.
  • AAPPMA Sélune
  • TAC quotas
  • Mandatory C&R strongly encouraged on all salmon given the restoration context.
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Sélune — Ducey LaManche France Old-Bridge-over-Selune-River-02
    Ducey LaManche France Old-Bridge-over-Selune-River-02
  2. Terrain map of the venue
    Terrain map
About this water

The Sélune is the most important river restoration project in European history. In 2021 and 2022, the Vezins and La Roche-qui-Boit dams were removed — the largest dam demolition ever undertaken on the continent — and roughly 90 kilometres of salmon habitat that had been locked away for over a century was opened again to the Atlantic. The scientific monitoring is ongoing and will continue for decades, but the early results are remarkable. Smolts emigrated from reaches that had not seen a salmon in 100 years within months of the reservoirs being drained. Adult fish followed. The fishing is still finding its shape. The lower and middle river below the old dam sites are gradually rewilding — the bed is readjusting, gravel bars are forming, the thermal regime is stabilising — and the salmon are returning in counts that build year by year. Fish the Sélune in the spring window with floating line and long leader for the lower beats, small tubes in coloured water. The upper beats above Ducey are increasingly productive for wild brown trout on a river that is still, in a real sense, being born. Treat the place with the respect the restoration deserves: catch-and-release on every salmon, disinfect your gear, and remember that every fish you meet is proof that a river can come back.

  • Granite
Water quality (WFD)
  • EcologyGood
  • ChemicalUnknown

WFD classification · FRHR351

The full read · show the working · for brown trout · confidence 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity52 × 12%6.2
Limiting factor: Water temperature (22.8°C) is outside Brown Trout's preferred range (10–16°C)= 53
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.
Directions
Seasons & zones
  • Salmon11 March → 31 July
  • Sea trout11 March → 31 October
  • Trout2nd Saturday of March → 3rd Sunday of September

Salmon: Banned (2026) — Atlantic salmon fishing banned across the Seine-Normandie basin in 2026.

Sea trout: Negligible (2026) — 3 declared sea trout in 2024. Biologically present but rod catches negligible.

Related guides
Booking & contacts