Freestone · Granite · Lozère / Haute-Loire, FR

Allier (Upper, Langogne–Langeac)

FR-48-Allier Valley2

Above Langeac the Allier becomes a different river.

Poor · Grayling
Pink Grayling Bug · Hook 16
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level1.35 mDropping after lift
  • Water temp7.0°C
  • ClaritySlightly colouredClearing
Today's fly
Pink Grayling Bug
Pink Grayling BugHook 16
in season · all-rounder
Conditions on the water
Live gauge
Level
Steady
1.35 m
Dropping after lift
Water temp7.0°C
ClaritySlightly coloured
Weather3°C
WindN 23 km/h
Pressure1007 hPa
Rain · recent16.4 mm
Rain · ahead1.4 mm

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

Water temperature for Grayling
Ideal
7°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn into late autumn — September through November prime. The upper Allier's grayling water above Vichy is some of the best in central France.
Where
Faster gravel runs and the heads of riffles through the Auvergne headwaters. Deeper glide tails as autumn cold pushes fish deeper.
Method
Euro-nymphing through the deeper pockets is the daily default. Switch to dries on autumn afternoons when sedges and olives come off.
Kit
10 ft #3 nymphing rod for the deep pockets; 9 ft #4 for dries. 4 to 5 lb fluoro tippet, 12 ft leader.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 6 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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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · November 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
Grayling fly box

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

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season
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
Other water nearby · 5
Gallery · 2
  1. FR-48-Allier Valley2
  2. Terrain map of the venue
    Terrain map
About this water

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)
  • Ecology: Good
  • Chemical: Failing 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 Grayling · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity90 × 18%16.2
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity44 × 12%5.3
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
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 → 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
Booking & contacts
At a glance

Allier (Upper, Langogne–Langeac) is a freestone river in Lozère / Haute-Loire, France. Its recorded elevation is about 957 m above sea level and the catchment geology is granite. The river is described as roughly 95 km long. Our data lists brown trout and grayling here. The trout season is recorded as running from 2nd Saturday of March to 3rd Sunday of September. The grayling season is recorded as running from 3rd Saturday of May to 3rd Sunday of September. Best window recorded for anglers: April–September — best dry fly June–August. Core methods listed: Czech nymphing; dry fly; upstream nymphing. Level and flow data for this water is linked from 1 gauge. Its recorded parent river is the Allier. Its Water Framework Directive ecological status is recorded as good. Access is recorded as day tickets through the local AAPPMA (angling association). Nearby waters in our listings include Lac de Naussac at 4.0 km, Loire (Upper) at 24 km and Chassezac at 33 km.