Spate · Granite · Brittany / Côtes-d'Armor

Trieux

Trieux venue image
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Small Brittany stream with wild trout on Armorican granite.

Species

A side-water session, not the main event

Low and clear — careful approach country. Long leader, small flies, slower casts.

75% confidence in this read
Water temperature for brown trout
Cool — slow
7°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature5228% weight
  • Flow6022% weight
  • Clarity9518% weight
  • Feeding Time4513% weight
  • Pressure807% weight
  • Prey Activity3012% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
7.2°C
Estimated
Clarity
Clear
Air temp
10°C
Wind
W 14 km/h
Gentle breeze
Pressure
1012 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
4.4 mm
Light rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

How to fish it · for brown trout
When
Through the open trout season. Spring olives and grannom; sedges through summer evenings; small dark flies into autumn close.
Where
Pool tails and the seams behind boulders through the Côtes-d'Armor stretches. Breton spate freestone — fish 12 to 24 hours after rain. The Trieux is a typical Côtes-d'Armor spate — short, sharp, wadeable.
Method
Upstream dry to risers; dry-dropper through the riffles. Breton spate freestone — fish 12 to 24 hours after rain on the drop. Long leader, fine tippet.
Kit
9 ft #4 — Breton spate freestone. Floating line, 12 ft leader to 4 lb fluoro. Studded boots.
Why this works
Good conditions. Clarity is favourable (95), Prey activity is weakest (30).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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

Gallery · 1
  1. Terrain map of the venue
    Terrain map
Permits & access
Permit required — see local rules.
  • AAPPMA permits.
Directions
Apple MapsGoogle Maps
About this water

Small Brittany stream with wild trout on Armorican granite. Fly-fishing potential for those willing to seek out intimate water. Spring through early autumn. Not crowded — solitude and wild trout are part of the appeal. Check local AAPPMA for access details and any seasonal restrictions.

  • Granite
Seasons & zones
  • Salmon1 March → 15 September
  • Trout2nd Saturday of March → 3rd Sunday of September

Salmon: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Sea trout: Banned (2026) — Brittany 2026 order bans Atlantic salmon and sea trout on all Breton rivers.

Other water nearby · 3
Booking & contacts