Spate · Slate Shale Snowdonia · Wales / Snowdonia (Mawddach catchment)

Afon Eden (Welsh)

The Afon Eden, a rocky Welsh river, flowing through woodland near Ganllwyd in Gwynedd

The Welsh Eden — not to be confused with the Cumbrian river of the same name — is a small Snowdonia tributary of the Mawddach, running mostly southerly from Trawsfynydd down to Y Ganllwyd.

Marginal · Brown Trout
Pheasant Tail Nymph · 14-16
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp19.2°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-16
Upstream, sub-surface
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp19.2°C
ClarityClear
Weather21°C
WindNW 14 km/h
Pressure1021 hPa
Rain · recent0.0 mm
Rain · ahead0.4 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Brown Trout
Warm — slow
19°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 19.2°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

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Sub-surface · on the nymphunder the surface

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Beyond the hatch · worth watchingambient prey

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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 · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2

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

Ranked for today
Brown Trout fly box
Beats · 1
Afon Eden — three Passport beats (Upper, Middle, Lower)Access varies
Three short day-ticket beats on the Welsh Eden — Upper (1¼ mile), Middle (½ mile), Lower — all bookable on the Fishing Passport at £10/day each.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. The Afon Eden, a rocky Welsh river, flowing through woodland near Ganllwyd in Gwynedd
    Afon Eden upstream of Pont ar Eden, near Ganllwyd, Gwynedd
  2. Terrain map of the venue
    Terrain map
About this water

The Welsh Eden — not to be confused with the Cumbrian river of the same name — is a small Snowdonia tributary of the Mawddach, running mostly southerly from Trawsfynydd down to Y Ganllwyd. Wild brown trout in spate-river water, three short Passport beats (Upper, Middle, Lower) at a tenner a day each. The kind of small water where a six-foot rod and a willingness to crawl are worth more than any amount of gear. Sea trout work up from the Mawddach but the Eden itself is a brown-trout river.

  • Slate shale snowdonia
The full read · show the working · for Brown Trout · confidence 80%
How the 33 is built — score × weight = contribution
Temperature36 × 28%10.1
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity57 × 12%6.8
Conditions total= 60
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout3 March → 30 September
Related guides
Yorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
Booking & contacts