Chalk · Normandy / Seine-Maritime, FR

Risle

Risle fishing venue photo

The Risle was Charles Ritz's own water — his stretch was at Aclou, on the middle river — and it is the largest of the Normandy chalk streams.

Today · Not the day for it
Coch-y-bonddu
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
Coch-y-bonddu
Coch-y-bonddu
Conditions on the water · Today
Live gauge
Level
Rising
0.18 m
Lifting fast
Water temp17.5°C
ClarityVery coloured
Weather19°C
WindN 17 km/h
Pressure1015 hPa
Rain · recent10.9 mm
Rain · ahead0.0 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
18°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
Water at 17.7°C — above the grayling caution line (17°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Hatch timeline · todayPeak at 5pm

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 33%
Also:Cinnamon Sedge21%
Peak emergence windowWeather boost7 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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14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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14-day free trial. Cancel anytime.

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
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
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
About this water

The Risle was Charles Ritz's own water — his stretch was at Aclou, on the middle river — and it is the largest of the Normandy chalk streams. It enters the Eure a modest ten metres across and, once the Charentonne and the Bave are in it, can run to thirty between Brionne and Corneville. That range is the point: the same river asks a different question of the angler every few miles. The lower river is big riffles and long glides over gravel, and its advantage to the fly fisher is that such water can be read from the bank before a line is put on it. Wild brown trout share it with barbel, dace and chub, so a rise is worth identifying before it is covered. Fish the seams where the current concentrates, and do not be shy of a heavier line than the small reaches need — a nine-foot five-weight is not over-gunned here. Upstream dry fly remains the sport, on olives through spring, the danica mayfly at the turn of May, and sedge into the evening. The upper reaches cross less permeable ground and respond faster to rain; the lower river is chalk and fines down quickly. There is no-kill fly water at Corneville-sur-Risle, Appeville-Annebault and Saint-Philibert, held by the Pont-Audemer association and included in its day and week permits.

  • Chalk
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 80%
How the 12 is built — score × weight = contribution
Temperature6 × 28%1.7
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity71 × 12%8.5
Limiting factor: Water temperature (17.7°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
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
Booking & contacts