Chalk · Normandy / Eure (Seine tributary)

Andelle

Andelle venue image
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The Andelle emerges from Normandy chalk moving with the precision of water that knows exactly where it came from.

Marginal · Brown Trout
Spent Spinner · 16-20
Marginallive now
Slow going — pick your moments
River steady at a fishable height. Take your time — read the water before you cast.
80% confidence
What moved it
  • Level0.50 mLast reading 10h ago
  • Water temp18.6°C
  • ClarityClear
Today’s fly
Spent Spinner
Spent Spinner16-20
Upstream dry
Conditions on the water
Live gauge
Level
Steady
0.50 m
Last reading 10h ago
Water temp18.6°C
ClarityClear
Weather23°C
WindNW 8 km/h
Pressure1022 hPa
Rain · recent0.2 mm
Rain · ahead1.1 mm

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

Water temperature for brown trout
Warm — slow
19°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the open trout season. Iron Blue and CDC grannom in April; olives through May; sedges through summer evenings; small dark flies into autumn.
Where
Pool tails and weeded glides through the Eure chalk-stream stretches. The Andelle is intimate Seine-tributary water.
Method
Upstream dry to spotted rising fish; long fine leader. The water reads clear — careful approach matters more than fly choice. Move slowly upstream, cast accurately, accept the result.
Kit
9 ft #4 — French karst-stream default. Floating line, 14 ft leader to 4 lb fluoro. Polarising glasses non-negotiable.
Why this works
⚠️ Water at 18.6°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 9 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
Grayling seasonSeason
1
2
2
2
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
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 permits
  • Some beats are private/estate water — verify access.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 19°C — probably warm enough to stress brown trout. These are likely cooler.
Arques
22 km
~15°C
Brown trout · Grayling · Sea trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The Andelle emerges from Normandy chalk moving with the precision of water that knows exactly where it came from. Classic chalk-stream character — clear, stable temperature, rich fly life. Wild brown trout and grayling. Selective fishing required: small, precise presentations to individual rising fish during mayfly, olive, and sedge hatches (April–June). Some beats private; check access before visiting.

  • Chalk
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

WFD ecological status Good → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRHR241 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRHR241

The full read · show the working · for brown trout · confidence 80%
How the 36 is built — score × weight = contribution
Temperature46 × 28%12.9
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity58 × 12%7.0
Conditions total= 69
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
  • Grayling3rd Saturday of May → 31 December
Related guides
Chalkstream Playbookchalk stream tacticsGrayling Playbookgrayling tacticsPyrenees PlaybookFrench rivers
Booking & contacts