Freestone · Limestone · Wallonia / Luxembourg Province, BE

Ourthe

Photo of Ourthe

Major Ardennes river flowing through La Roche-en-Ardenne and picturesque Durbuy.

Today · A side-water session, not the main event
Coch-y-bonddu
Forecast · Today
A side-water session, not the main event
A patient day. Fish the cover and stay with it.
45% projected
Today's fly
Coch-y-bonddu
Coch-y-bonddu
Conditions on the water · Today
Live gauge
Level
Rising
0.12 m
Lifting fast
Water temp14.0°C
ClarityVery coloured
Weather21°C
WindN 19 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead5.9 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Grayling
Ideal
14°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Caddisflies
Gammarids
Hatch timeline · todayPeak at 2pm

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 44%
Also:Heather Fly39%Pale Watery26%Cinnamon Sedge26%
Peak emergence window10 food groups active

Peak activity at 2pm — Autumn Dun (Autumn Dun, 12 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · September 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
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
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.

Ranked for today
Grayling fly box

A proper Ardennes river-trout pack for Wallonia, centred on clear to lightly coloured rivers with trout and some classic fly-fishing culture.

Small Perdigón
Small Perdigón
Hook 14–18 · Fly
in season · matches water height
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
Other water nearby · 5
Lesse
37 km
Brown trout · Grayling
Amblève
38 km
20
Brown trout · Grayling
Semois
44 km
Brown trout · Grayling
Warche
53 km
20
Brown trout · Grayling
Lake Robertville
55 km
Brown trout · Rainbow trout
Gallery · 2
  1. Photo of Ourthe
    Ourthe
  2. Terrain map of the venue
    Terrain map
About this water

Major Ardennes river flowing through La Roche-en-Ardenne and picturesque Durbuy. Limestone influence gives clearer water in sections and supports brown trout and grayling. Longer drifts and pools than the small spate streams—a river with character and scale. The lower Ourthe near Durbuy runs through scenery that rewards pausing between casts.

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

WFD classification · BERW06_OU06R

The full read · show the working · for Grayling · confidence 55%
How the 76 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity66 × 12%7.9
Conditions total= 76
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 3rd Saturday of March → 30 September
  • Grayling 1 June → 28 February
Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts