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.

Marginal · Brown Trout
CDC Emerger · 16-18
New ruleReported 8 Aug 2026

Severe drought restrictions (crise) in force

The bassin du Tarn zone (Dept 48) is at crise — the second-highest French drought tier — under a préfectoral arrêté. Fishing itself is not named as prohibited, but water is severely restricted and flows are likely very low; fish with care and check locally.

Arrêté préfectoral n°37588

Temporary notices from official orders and recent fishery reports — they clear automatically once out of date. Always confirm locally before travelling.

Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level0.48 mLast reading 2h ago
  • Water temp18.5°C
  • ClarityClear
Today's fly
CDC Emerger
CDC Emerger16-18
Dead-drift
Conditions on the water
Live gauge
Level
Steady
0.48 m
Last reading 2h ago
Water temp18.5°C
ClarityClear
Weather19°C
WindN 5 km/h
Pressure1018 hPa
Rain · recent18.8 mm
Rain · ahead1.8 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
19°C est.ideal 1016°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 close.
Where
Pool tails and pocket water through the Lozère gorge stretches. Cévennes freestone — clear water, intimate scale.
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 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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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 · August 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

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

Permits & access
Permit required — see local rules.
  • AAPPMA permits.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
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

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. 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)
  • EcologyModerate
  • ChemicalUnknown
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 Brown Trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature47 × 28%13.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 69
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
Seasons & zones
  • Trout 2nd Saturday of March3rd Sunday of September
  • Grayling 3rd Saturday of May3rd 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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