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

Lac du Drennec

Lac du Drennec venue image
Fair · Trout
Diawl Bach · 12-14
New ruleReported 7 Aug 2026

Severe drought restrictions (crise) in force

A préfectoral drought order places this catchment's surface water at crise, the highest of France's four restriction tiers. Fishing itself is not named in the order, but flows are low and water-use restrictions are in force. Zone: ELORN (dépt 29).

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Temporary notices from official orders and recent fishery reports — they clear automatically once out of date.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
Useful ripple, fishable wave. Worth a session if the wind holds.
57% confidence

Lac du Drennec is often best in spring through autumn.

What moved it
  • WindSW 31 km/hFresh breeze
Today's fly
Diawl Bach
Diawl Bach12-14
Retrieve
Conditions on the water
Estimate
Wind
Fresh breeze
SW 31 km/h
N
SW
from the south-west
Wave60 cm wave
Water temp18.1°C
Air temp17°C
CloudOvercast
Pressure1006 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

Sedge should come on through the afternoon as the water warms.

Boat — at anchor

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

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 with Pro.

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14-day free trial. Cancel anytime.

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
Permits & access
Permit required — see local rules.
  • AAPPMA permits
  • Check local regulations.
What's coming
Plan ahead
5-day outlook
Condition match
57%
Cloud50%
Wind30%
Temp100%

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

Fishing better nearby · 5
Gallery · 1
  1. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • EcologyGood
  • ChemicalUnknown

WFD classification · FRGR0069B

Why this score
  • Wind conditions (windy) are not ideal for this water.
  • Temperature (cool) is in the sweet spot for summer fishing.
  • Daddy longlegs are in their seasonal window, boosting the chance of targeted feeding.
Directions
Seasons & zones
  • Trout 2nd Saturday of March3rd Sunday of September
Related guides
Booking & contacts