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

Lac du Drennec

Lac du Drennec venue image

110 ha lake in the Monts d'Arrée.

Marginal · Trout
Small Damsel · 8-12
New ruleReported 7 Aug 2026

Severe drought restrictions (crise) in force

The ELORN zone (Dept 29) 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°37652

Temporary notices from official orders and recent fishery reports — they clear automatically once out of date.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

A patient day, if you fancy it
Good wave on — drift country. Slow going — pick your moments and do not force it.
38% confidence
limited data

Lac du Drennec is often best in spring through autumn.

What moved it
  • WindN 17 km/hGentle breeze
Today's fly
SD
Small Damsel8-12
Retrieve
Conditions on the water
Live gauge
Wind
Gentle breeze
N 17 km/h
N
N
from the north
Wave20 cm ripple
Water temp
Air temp19°C
CloudClear
Pressure1018 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
The sedge is on. Murrough may also come into play as the day warms. The ripple is helpful — fish should move onto the feed and a slow-drifted team or single wet will cover water well. The breeze will be blowing terrestrial insects onto the water — check the wind lanes and downwind margins for rising fish.
Where
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Set up a broadside drift and cover the water systematically. 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

Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.

Boat — drift

A gentle ripple is ideal for drifting — broadside drift covering the wind lanes should be productive.

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 5 with Pro.

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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
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.

SD
Small Damsel
8-12 · Pattern
Retrieve
Permits & access
Permit required — see local rules.
  • AAPPMA permits
  • Check local regulations.
What's coming
Plan ahead
5-day outlook
Condition match
52%
Cloud25%
Wind65%
Temp60%

A reasonable day here, though cloud isn't quite in the sweet spot.

Other water nearby · 5
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)
  • EcologyGood
  • ChemicalUnknown

WFD classification · FRGR0069B

Why this score
  • Sedge is in its seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
  • Trout 2nd Saturday of March3rd Sunday of September
Related guides
Booking & contacts