Stillwater · Granite · Brittany / Finistère (Monts d'Arrée), FR

Lac du Drennec

Lac du Drennec venue image

110 ha lake in the Monts d'Arrée.

Fair · Trout
Diawl Bach · 12-14
New ruleReported 7 Aug 2026

Severe drought restrictions (crise) in force

VigiEau lists this venue's surface-water zone (ELORN, dépt 29) at crise, under an official préfectoral drought arrêté. Fishing is not itself banned by it, but water levels are low — go gently on stressed fish.

Arrêté préfectoral n°37652 ↗

Temporary notices from official orders and recent fishery reports — they clear automatically once out of date.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

Fairlive now
Good drifting conditions on Lac du Drennec
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.
56% confidence

Lac du Drennec is often best in spring through autumn.

What moved it
  • WindS 32 km/hFresh breeze
Today's fly
Diawl Bach
Diawl Bach12-14
Retrieve
Conditions on the water
Estimate
Wind
Fresh breeze
S 32 km/h
N
S
from the south
Wave60 cm wave
Water temp20.2°C
Air temp22°C
CloudOvercast
Pressure1009 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
The daddy longlegs are on. Wind-blown Terrestrials may also come into play as the day warms. The breeze will be blowing terrestrial insects onto the water — check the wind lanes and downwind margins for rising fish.
Where
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.

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.

Boat — at anchor

Windy conditions suit anchoring in productive areas rather than open-water drifting.

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
1
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1

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

Ranked for today
Trout fly box

Closer to wild-lake trout fishing than to competition réservoirs. More room for naturals, caddis, buzzer, terrestrial and modest lure use.

Permits & access
Permit required — see local rules.
  • AAPPMA permits
  • Check local regulations.
What's coming
Plan ahead
5-day outlook
Condition match
35%
Cloud50%
Wind30%
Temp25%

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

Cooler water nearby · 1
Water here around 20°C — probably warm enough to stress Trout . These are likely cooler.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

110 ha lake in the Monts d'Arrée. Feral rainbow and wild brown trout. Best spring through early autumn fishing. Fly-fishing opportunity on this substantial lake. Check Finistère regulations for permits and daily catch limits. Car-accessible lake fishing with good potential.

  • Lake
  • Granite
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · FRGR0069B

Why this score
  • Wind conditions (windy) are not ideal for this water.
  • Daddy longlegs are in their seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
  • Trout 2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts