Freestone · Limestone · Wallonia / Namur Province

Lesse

Lesse venue image
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Ardennes river famous for the caves at Han-sur-Lesse where the river disappears underground.

Marginal · Brown Trout
Pheasant Tail Nymph · 14-18
Marginallive now
Slow going — pick your moments
River steady at a fishable height. Take your time — read the water before you cast.
90% confidence
What moved it
  • Level0.84 mLast reading 12h ago
  • Water temp18.3°C
  • ClarityClear
Today’s fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
Upstream
Conditions on the water
Live gauge
Level
Steady
0.84 m
Last reading 12h ago
Water temp18.3°C
ClarityClear
Weather23°C
WindN 11 km/h
Pressure1021 hPa
Rain · recent0.0 mm
Rain · ahead1.1 mm

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

Water temperature for brown trout
Warm — slow
18°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
⚠️ Water at 18.3°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

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
Grayling seasonSeason
2
1
1
2
2
2
2
2
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

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

Ranked for today
Brown Trout fly box
SB
Small Black Beetle
14-18 · Pattern
Upstream dry
Permits & access
Permit required — see local rules.
  • Permis de pêche (Wallonia) / Visverlof (Flanders)
  • Foreign anglers can purchase a Walloon fishing permit (permis de pêche) online or at post offices without residency requirements
  • For Flemish waters, the visverlof is similarly available
  • No prior fishing exam required in either region.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 18°C — probably warm enough to stress brown trout. These are likely cooler.
Ourthe
37 km
~15°C
Brown trout · Grayling
Semois
27 km
~15°C
Brown trout · Grayling
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Ardennes river famous for the caves at Han-sur-Lesse where the river disappears underground. Brown trout and grayling in limestone-rich water with good hatches. Some sections experience kayak traffic in summer—fish early or late. Club permits required.

  • Limestone
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown

WFD classification · BERW06_LE07R

The full read · show the working · for brown trout · confidence 90%
How the 38 is built — score × weight = contribution
Temperature51 × 28%14.3
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Conditions total= 71
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout3rd Saturday of March → 30 September
  • Grayling1 June → 28 February
Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts