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

Sioule

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

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.

Today · Closed season
Coch-y-bonddu
Forecast · Today
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Coch-y-bonddu
Coch-y-bonddu
Conditions on the water · Today
Live gauge
Flow
Rising
5.1 m³/s
Lifting fast
Water temp17.6°C
ClarityUnfishable
Weather21°C
WindN 17 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead17.5 mm

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

Water temperature for Brown Trout
Warm — slow
18°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 18°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Caddisflies
Hatch timeline · todayPeak at 5pm

12pm(now) — Heather Fly

Stage: Terrestrials on topApproach: Dry flyActivity: 41%
Also:Reed Smut29%Cinnamon Sedge23%
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

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 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
1
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1

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

Ranked for today
Brown Trout fly box

French nymph-first water. Fast current, technical presentation, weighted nymphs and emergers, with dry flies when fish rise.

Permits & access
Permit required — see local rules.
  • AAPPMA permits
  • Auvergne regulations.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 18°C — probably warm enough to stress Brown Trout . These are likely cooler.
Pisciculture Bône
24 km
~16°C
Rainbow trout
Lac d'Aydat
41 km
~17°C
Brown trout · Pike
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.

Hatches & food

In freestone rivers of the Massif Central, resident brown trout feed through a spring build-up of olives and stoneflies into a long summer of caddis and small buzzers, with terrestrials becoming important from early summer; higher volcanic plateaux and colder headwaters tend to run later than the lower freestones.

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

WFD classification · FRGR1338

The full read · show the working · for Brown Trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature42 × 28%11.8
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity71 × 12%8.5
Conditions total= 72
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2nd Saturday of March → 3rd Sunday of September
  • Grayling 3rd 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
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