Chalk · Normandy / Seine-Maritime

Risle

Risle — La Risle vue vers l'amont, prise de Saint-Samson-de-la-Roque
Poor · Brown Trout
Spent Spinner · 16-20
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
  • Level0.13 mLast reading 23 min ago
  • Water temp23.2°C
  • ClarityClear
Today's fly
Spent Spinner
Spent Spinner16-20
Upstream dry
Conditions on the water
Live gauge
Level
Steady
0.13 m
Last reading 23 min ago
Water temp23.2°C
ClarityClear
Weather35°C
WindE 5 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead0.4 mm

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

Water temperature for Brown Trout
Warm — slow
23°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. Iron Blue and CDC grannom in April; olives through May; sedges through summer evenings.
Where
Pool tails, weeded glides, and the ranunculus runs through the chalk-stream stretches. Watch under the alders for trout sipping in the cushion of slow 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 23.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
Survey-backed · regionalModerate confidence

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

Updated 19 hours ago

Through the year
0–3 scale · August 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
Brown SedgeHatch
2
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Blue Winged OliveHatch
2
3
3
3
3
2
Mayfly (Green Drake)Hatch
2
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Risle — La Risle vue vers l'amont, prise de Saint-Samson-de-la-Roque
    La Risle vue vers l'amont, prise de Saint-Samson-de-la-Roque
  2. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Failing to achieve good
What this classification means

WFD re-coded 2026-06-18: prior id FRHR2105 returned no row in EEA WISE. Re-mapped to FRHR268 'La Risle du confluent de la Charentonne au confluent de la Corbie' — the middle trout reach. Status: EEA WISE 2022 (3rd RBMP). Confidence: medium — VERIFY: the pack coordinate (49.50,0.72) sits low/near the maritime limit (FRHT07); if the venue is the lower river re-map accordingly. Source: discodata.eea.europa.eu.

WFD classification · FRHR268

The full read · show the working · for Brown Trout · confidence 90%
How the 2 is built — score × weight = contribution
Temperature1 × 28%0.3
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity44 × 12%5.3
Limiting factor: Water temperature (23.2°C) is outside Brown Trout's preferred range (10–16°C)= 54
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
  • Trout 2nd Saturday of March → 3rd Sunday of September
  • Grayling 3rd Saturday of May → 31 December

    France national rule: grayling opens 3rd Saturday of May in all waters. In 2nd category waters, grayling remains open until 31 December. Departmental regulations may impose earlier closing dates. Always check the relevant département's 2026 arrêté préfectoral.

Related guides
Chalkstream Playbookchalk stream tacticsGrayling Playbookgrayling tacticsPyrenees PlaybookFrench rivers
Booking & contacts