Freestone · Granite · Lozère, FR

Tarn (Upper)

Aerial view of the Tarn river winding through the deep limestone Gorges du Tarn, with a village and wooded slopes visible.

The upper Tarn rises on the Cévennes flank of Mont Lozère and runs south-west through granite and schist country before the famous limestone gorges take over further down.

Poor · Grayling
Pink Grayling Bug · Hook 16
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level1.27 mLast reading 3h ago
  • Water temp6.8°C
  • ClarityClear
Today's fly
Pink Grayling Bug
Pink Grayling BugHook 16
in season · all-rounder
Conditions on the water
Live gauge
Level
Steady
1.27 m
Last reading 3h ago
Water temp6.8°C
ClarityClear
Weather1°C
WindNE 10 km/h
Pressure1013 hPa
Rain · recent24.3 mm
Rain · ahead13.2 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 through November prime.
Where
Faster runs through the middle Lozère reaches.
Method
Euro-nymphing through the deeper pockets; switch to dries when sedges or olives come off in autumn afternoons.
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 5 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 3 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

More balanced than the mountain-river pack. French nymphing still matters, but there is more room for dries, spiders and general searching flies.

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season
Permits & access
Permit required — see local rules.
  • AAPPMA permits.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
  1. Aerial view of the Tarn river winding through the deep limestone Gorges du Tarn, with a village and wooded slopes visible.
    Gorges du Tarn, France
  2. Terrain map of the venue
    Terrain map
About this water

What most tourists think of as the Gorges du Tarn is the postcard section below Florac; the fishing is further up, in the headwater country above Les Vignes where wild brown trout and grayling share fast runs with the occasional deep holding pool. The grayling here are the real draw — good numbers, willing feeders, and educated enough to make you pay attention. Work upstream with a small olive or baetis imitation in spring, move to caddis in June, keep a brace of pheasant-tail nymphs for when nothing is showing. The gauge runs quickly after rainfall — which is often, because this is Cévennes weather — so plan with the trend in mind. A classic southern river in a landscape that will distract you from the fishing, which is its own kind of problem.

  • Granite
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

WFD ecological status Good → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRFR305 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRFR305

The full read · show the working · for Grayling · confidence 55%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time15 × 13%2.0
Pressure80 × 7%5.6
Insect activity27 × 12%3.2
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
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

Tarn (Upper) is a freestone river in Lozère, France. Its recorded elevation is about 871 m above sea level and the catchment geology is granite. The river is described as roughly 60 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: March–September. Core methods listed: Nymphing; dry fly. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as moderate. Access is recorded as day tickets through the local AAPPMA (angling association). Nearby waters in our listings include Chassezac at 23 km, Cèze at 33 km and Beaume at 40 km.