Chalk · Pas-de-Calais / Boulogne-sur-Mer

Liane

Liane venue image
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The Liane runs about forty kilometres from its source near Quesques down through Samer to Boulogne-sur-Mer, a short coastal chalk stream that most fly anglers have never heard of.

Species

A proper day on the water

Low and clear — careful approach country. Stay small, stay accurate.

75% confidence in this read
Water temperature for brown trout
Cool — slow
9°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature8028% weight
  • Flow6022% weight
  • Clarity9518% weight
  • Feeding Time5013% weight
  • Pressure807% weight
  • Prey Activity4812% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
8.9°C
Estimated
Clarity
Clear
Air temp
10°C
Wind
SW 24 km/h
Moderate breeze
Pressure
1011 hPa
Rain · 48h
0.7 mm
No meaningful rain
Rain · ahead
4.6 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. Olives April through May; sedges through summer evenings.
Where
Pool tails and pocket water through the Boulogne valley. The Liane is small intimate chalk water.
Method
Upstream dry to spotted rising fish; long fine leader. The water reads clear — careful approach matters more than fly choice. Move slowly upstream, cast accurately, accept the result.
Kit
9 ft #4 — French karst-stream default. Floating line, 14 ft leader to 4 lb fluoro. Polarising glasses non-negotiable.
Why this works
Good conditions. Clarity is favourable (95), Prey activity is weakest (48).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Large Dark OliveHatch
1
2
2
1
March BrownHatch
1
2
1
Iron BlueHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1

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 access
  • Sea trout fishing concentrated on lower meadows below Hesdin-l'Abbé — verify permit coverage of the tidal sections.
Directions
Apple MapsGoogle Maps
About this water

The Liane runs about forty kilometres from its source near Quesques down through Samer to Boulogne-sur-Mer, a short coastal chalk stream that most fly anglers have never heard of. The upper half is proper brown trout water — clear, watercressed, rich with olives and sedges — and the lower half, below the tidal limit, gets a genuine sea trout run in late summer and autumn. It's not a famous river and it's not a large one, but it has the things that matter: stable water temperatures, proper fly life, wild fish. The AAPPMA beats around Hesdin-l'Abbé are good value for a day's fishing, and the sea trout fishing in the lower meadows in September, when the water drops and the fish come in on the bigger tides, is the kind of thing you remember.

  • Chalk
Seasons & zones
  • Trout2nd Saturday of March → 3rd Sunday of September
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