Stillwater · Limestone · Savoie / Prealpes, FR

Lac du Bourget

Lac du Bourget — Lac du Bourget, France

The Bourget is the largest natural lake in France and quite possibly the coldest at depth, which is why the Arctic char have held on here through every warming summer the Alps have thrown at them.

Fair · Trout
Hare's Ear Nymph · 14-16
Fairlive now
Buzzer expected on Lac du Bourget
Water temperature is the limiting factor today, not the wave. Fish dawn or dusk if you go at all, and handle everything with extra care.
59% confidence

Lac du Bourget is often best in spring through autumn.

What moved it
  • WindW 3 km/hCalm
Today's fly
Hare's Ear Nymph
Hare's Ear Nymph14-16
Upstream
Conditions on the water
Estimate
Wind
Calm
W 3 km/h
N
W
from the west
WaveFlat calm
Water temp18.0°C
Air temp23°C
CloudOvercast
Pressure1020 hPa
Rain · recent0.0 mm

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

How to fish it · for Trout
When
April–June and September–October
Where
With limited drift, anchor or fish static from sheltered positions. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point. In the calm, a single dry fly or a slowly-fished nymph tends to out-fish an active retrieve.
The plan
Plan A

With limited drift, anchor or fish static from sheltered positions. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point. In the calm, a single dry fly or a slowly-fished nymph tends to out-fish an active retrieve.

Plan B

If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.

Watch for

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

Either bank or boat

Calm evenings can fish well from bank or boat — target rising fish wherever you find them.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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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
2
2
2
2
2
1
CaenisHatch
2
3
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Silverhorns & LonghornsHatch
2
3
3
3
2
Daddy Long LegsHatch
2
3
2

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

Ranked for today
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 Lac du Bourget + boat fishing supplement
  • Depth restrictions apply to certain char techniques
  • Check Savoie prefectoral order for current rules.
What's coming
Plan ahead
5-day outlook
Condition match
49%
Cloud50%
Wind65%
Temp25%

Conditions are away from Lac du Bourget's sweet spot — it usually fishes best in ripple wind with cloud skies.

Cooler water nearby · 1
Water here around 18°C — probably warm enough to stress Trout . These are likely cooler.
Gallery · 2
  1. Lac du Bourget — Lac du Bourget, France
    Lac du Bourget, France
  2. Terrain map of the venue
    Terrain map
About this water

The Bourget is the largest natural lake in France and quite possibly the coldest at depth, which is why the Arctic char have held on here through every warming summer the Alps have thrown at them. It is a long, deep limestone trench — the sort of water that looks indifferent to you from the shore because it more or less is. Most of the char fishing happens vertically from a boat at thirty to fifty metres with weighted nymphs, which is how the locals have always done it and how the fish have always been caught. There are trout along the quieter edges in April and May if you can find them, and the féra run through the mid-depths in numbers that would surprise anyone who only knows the lake from the motorway. It is not quick water, and it is not water that rewards impatience, but it is good water and it deserves the time.

  • Lake
  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Good
What this classification means

WFD ecological status Moderate → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRDL60 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRDL60

Why this score
  • Sedge is in its seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
  • Trout Last Saturday of January → End of December
  • Char varies_by_lake → varies_by_lake

    French lake char (omble chevalier / omble de fontaine) — seasons and retention rules are set by departmental regulations and local fishing associations (AAPPMA). French char lakes are often managed with strict rules. Check the local AAPPMA or departmental fishing regulations before targeting char.

Related guides
Booking & contacts