Chalk · Normandy / Seine-Maritime (Dieppe area), FR

Scie

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Small Normandy chalk stream flowing toward the Seine estuary where spring water keeps temperature stable and trout selective.

Today · Not the day for it
Peute
Forecast · Today
Not the day for it
Not much stacked in your favour today. Worth an hour if you are nearby, not worth the special trip.
80% projected
Today's fly
Peute
Peute
Conditions on the water · Today
Live gauge
Level
Rising
0.69 m
Lifting fast
Water temp17.2°C
ClarityUnfishable
Weather19°C
WindN 19 km/h
Pressure1015 hPa
Rain · recent16.0 mm
Rain · ahead0.6 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Grayling
Warm — slow
17°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Water at 17.1°C — above the grayling caution line (17°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Caddisflies
Gammarids
Hatch timeline · todayPeak at 5pm

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 36%
Also:Cinnamon Sedge22%
Peak emergence windowWeather boost8 food groups active

Peak activity at 5pm — Summer River Midge (Summer River Midge, Weather boost)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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Evidence
Survey-backed · regionalHigh confidence

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

Through the year
0–3 scale · September 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
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Mayfly (Green Drake)Hatch
2
2
Brown SedgeHatch
2
3
3
3
2
Small SpurwingHatch
2
3
3
3
2

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

Ranked for today
Grayling fly box

Classic French chalkstream fishing. Gin-clear, weed-rich, slow to moderate flow. Dry fly and sight nymphing dominate. Stronger sedge hatches than English equivalents. French tradition favours flush-sitting dries (comparaduns, CDC patterns) and upstream presentation.

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
  • AAPPMA permits.
What's coming
Plan ahead
5-day outlook
Water here around 17°C. Nothing cooler within range — carry a thermometer.
About this water

Small Normandy chalk stream flowing toward the Seine estuary where spring water keeps temperature stable and trout selective. Wild brown trout and grayling. Classic patterns: small olives and ephemeralids (16–18), sedges (14–16) evening. Pocket water where reading current and understanding trout lies matters more than distance casting. Some access restricted; check AAPPMA.

Hatches & food

In chalk-spring and karst trout systems, generally stable temperatures broaden olive and other mayfly activity from early spring into autumn, with strong evening caddis, steady subsurface scuds and buzzers where clear groundwater and weedbeds develop, and terrestrials from meadow and woodland banks rounding out the food calendar, depending on how fast each river drops and clears after rain.

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

WFD classification · FRHR167

The full read · show the working · for Grayling · confidence 80%
How the 22 is built — score × weight = contribution
Temperature11 × 28%3.1
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
Limiting factor: Water temperature (17.1°C) is outside Grayling's preferred range (4–14°C)= 51
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 4–14 °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