Chalk · Normandy / Seine-Maritime, FR

Risle

Risle fishing venue photo
Fair · Grayling
Pink Grayling Bug · Hook 16
Fairlive now
A side-water session, not the main event
River dropping into shape after a lift. Worth a few hours before it drops away.
75% confidence
What moved it
  • Level0.16 mDropping after lift
  • Water temp15.6°C
  • ClarityClear
Today's fly
Pink Grayling Bug
Pink Grayling BugHook 16
in season · matches water height · all-rounder
Conditions on the water
Live gauge
Level
Steady
0.16 m
Dropping after lift
Water temp15.6°C
ClarityClear
Weather13°C
WindSE 12 km/h
Pressure1017 hPa
Rain · recent0.0 mm
Rain · ahead9.2 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
16°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn through November prime. The Risle's grayling fish well in cool chalk water.
Where
Faster gravel runs and the heads of riffles through the middle and lower river. Deeper glide tails into autumn.
Method
Euro-nymphing through the deeper pockets is the daily default; switch to dries on autumn afternoons when sedges and small olives come off. Long fine tippet for the clear water.
Kit
10 ft #3 nymphing rod for the deep pockets; 9 ft #4 for dries. 4 to 5 lb fluoro tippet, 12 ft leader.
Why this works
Good — water clarity is working for you, but time of day is the limiting factor today.
Likely species
Caddisflies
Hatch timeline · todayPeak at 16 Uhr

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.

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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
Fly box · Grayling
Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Pisciculture la Fontaine à Roger
11 km
Rainbow trout
Charentonne
13 km
Brown trout
Pisciculture de Bernay
13 km
Brown trout · Rainbow trout
Pisciculture du Claireau
19 km
Rainbow trout · Brown trout · Char
Calonne (Trout Farm)
23 km
Rainbow trout
Gallery · 4
  1. Pont sur la Risle à Grosley-sur-Risle
    Pont sur la Risle à Grosley-sur-Risle
  2. 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
  3. Ajou
    Ajou
  4. 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 Grayling · confidence 75%
How the 60 is built — score × weight = contribution
Temperature39 × 28%10.9
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time25 × 13%3.3
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 60
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 2. Saturday im March → 3. Sunday im September
  • Grayling 3. Saturday im 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