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

Lac du Drennec

Lac du Drennec terrain map
Terrain map

110 ha lake in the Monts d'Arrée.

Fair · Trout
Caddis Emerger · 12-16
A respectable few hours, if you choose your moments
Good wave on — drift country. A useful wave. Work the productive shore.
46% confidence
limited data

Lac du Drennec is often best in spring through autumn.

What moved it
  • WindNE 12 km/hLight breeze
Today’s fly
CE
Caddis Emerger12-16
Dead-drift
Conditions on the water
Live gauge
Wind
Light breeze
NE 12 km/h
N
NE
from the north-east
Wave20 cm ripple
Water temp
Air temp18°C
CloudBroken
Pressure1017 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for trout
When
The great red sedge is on. Wind-blown Terrestrials 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.
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. In the ripple, a bushy searching dry (Hopper, Shipman's, Elk Hair Caddis) outperforms flush emergers — it stays visible and holds the surface tension.
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. In the ripple, a bushy searching dry (Hopper, Shipman's, Elk Hair Caddis) outperforms flush emergers — it stays visible and holds the surface tension.

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

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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Through the year
0–3 scale · July 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
Permits & access
Permit required — see local rules.
  • AAPPMA permits
  • Check local regulations.
What's coming
Plan ahead
5-day outlook
Condition match
79%
Cloud70%
Wind100%
Temp60%

A good match for Lac du Drennec — most conditions are close to what it fishes best in.

Other water nearby · 5
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
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Great Red Sedge is in its seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
  • Trout2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts