Freestone · Granite · Lozère / Haute-Loire

Allier (Upper, Langogne–Langeac)

Langogne venue image
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Above Langeac the Allier becomes a different river.

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 temp22.1°C
  • ClarityClear
Today’s fly
Small Perdigón
Small Perdigón16-20
Euro-nymph
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.1°C
ClarityClear
Weather27°C
WindN 8 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead1.3 mm

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

Water temperature for brown trout
Warm — slow
22°C est.ideal 1016°C
0°14°28°
How to fish it · for brown trout
When
Through the open trout season — March through September. Spring olives; sedges in summer; the upper Allier holds wild browns above the dam at Vichy.
Where
Pool tails, riffle heads, and the cushion behind boulders through the Massif Central headwaters. Above Vichy is wild trout-and-grayling water — no migratories pass the dam.
Method
Upstream dry to risers; nymph the deeper pockets between hatches. The headwater Allier is intimate — short casts, careful approach.
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 22.1°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.
  • AAPPMA Haute-Loire
  • Fly-only parcours in several reaches — verify locally.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Above Langeac the Allier becomes a different river. The gorge work starts — proper basalt-and-granite gorge, cut deep, with long pools and pocket water between them — and the salmon water gives way to trout and grayling country. This is the Haute-Loire reach, running up through Monistrol and Brioude and then up into the volcanic highlands of the Lozère, where the river is clear, cold, and stony, and the crowds of the Brioude salmon beats are a memory. The wild brown trout here are honest fish — six to twelve inches the general run, with the occasional surprise in the gorge pools that makes you pay attention. The grayling are steady and rise well to small olives from May onwards. The hatches are proper freestone work: Baetis through spring, building caddis from May, good stoneflies in the rough water, and enough March Brown action in the lower sections to remind you that this is still a significant river even when it is behaving like a small one. Fish it with nymph through April and the first half of May, shift to dry fly once the caddis are out, and accept that the best water takes commitment to reach. The Haute-Loire landscape is part of the bargain.

  • Granite
Water quality (WFD)
  • EcologyGood
  • ChemicalFailing to achieve good
What this classification means

WFD chemical status Good → Failing to achieve good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRGR0141A (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRGR0141A

The full read · show the working · for brown trout · confidence 90%
How the 12 is built — score × weight = contribution
Temperature6 × 28%1.7
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity43 × 12%5.2
Limiting factor: Water temperature (22.1°C) is outside Brown Trout's preferred range (10–16°C)= 52
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
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.

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