Freestone · Granite · Massif Central / Puy-de-Dôme

Sioule

A wooded river gorge with a stone bridge crossing the Sioule river, Puy-de-Dôme, France.
Contributor photo

Gorges de la Sioule, Puy-de-Dôme

Olive Titus - CC BY 2.0

The Sioule flows through volcanic Auvergne terrain where basalt and granite create a river of character — clear, responsive to rainfall, with strong populations of wild brown trout and grayling.

Poor · Brown Trout
Small Perdigón · 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
  • LevelDry recentlyNo gauge reading
  • Water temp23.3°C
  • ClarityClear
Today’s fly
Small Perdigón
Small Perdigón16-20
Euro-nymph
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp23.3°C
ClarityClear
Weather32°C
WindNE 5 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead9.3 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

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. Spring olives April through May; sedges through summer evenings; small dark flies into autumn.
Where
Pool tails and pocket water through the Puy-de-Dôme valley. The Sioule runs intimate Auvergne freestone.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet. Move slowly, cast accurately.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Why this works
⛔ Water at 23.3°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
1
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
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.
  • Carte de pêche AAPPMA
  • Réglementation d'Auvergne.
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. A wooded river gorge with a stone bridge crossing the Sioule river, Puy-de-Dôme, France.
    Gorges de la Sioule, Puy-de-Dôme
  2. Terrain map of the venue
    Terrain map
About this water

The Sioule flows through volcanic Auvergne terrain where basalt and granite create a river of character — clear, responsive to rainfall, with strong populations of wild brown trout and grayling. Excellent Baetis, caddis, and stonefly hatches. Multiple tributaries offer variety. Freestone fishing: fast water, pocket trout, responsive to insect activity. Spring through early summer best. Check AAPPMA.

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

WFD classification · FRGR1338

The full read · show the working · for brown trout · confidence 90%
How the 2 is built — score × weight = contribution
Temperature1 × 28%0.3
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Limiting factor: Water temperature (23.3°C) is outside Brown Trout's preferred range (10–16°C)= 49
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 → 3rd Sunday of September

    France national rule: grayling opens 3rd Saturday of May in all waters. In 1st category (salmonid) rivers, grayling closes with the trout season on the 3rd Sunday of September. Departmental regulations may impose additional restrictions. Always check the relevant département's 2026 arrêté préfectoral.

Related guides
Grayling Playbookgrayling tacticsPyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
Booking & contacts