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.

Poor · Brown Trout
Pheasant Tail Nymph · 14-16
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • LevelProxyvia Dovey (Dyfi)
  • Water temp23.0°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-16
Upstream, sub-surface
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Dovey (Dyfi)
Water temp23.0°C
ClarityClear
Weather22°C
WindW 14 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from Dovey (Dyfi). The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Warm — slow
23°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 23°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 6 active hatches hour by hour with Pro.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Survey-backed · regionalHigh confidence

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

Through the year
0–3 scale · August 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

Spider-heavy and practical. Strong tradition of North Country soft hackles, useful nymphing, and simple dry flies when fish rise properly.

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.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 4
Probably above the Brown Trout safety line — these are likely cooler, but carry a thermometer.
Llyn Eiddew Mawr
11 km
~15°C
Brown trout
Mawddach
5.0 km
~17°C
Brown trout · Salmon · Sea trout
Llyn Cwm Nantcol
11 km
~19°C
Brown trout · Rainbow trout
Llyn Trawsfynydd Reservoir
12 km
~22°C
Brown trout · Rainbow trout
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 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity57 × 12%6.8
Limiting factor: Water temperature (23°C) is outside Brown Trout's preferred range (10–16°C)= 56
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Dovey (Dyfi)proxy
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
  • Trout 3 March → 30 September
Related guides
Yorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts