Spate · Upland · North West Wales / Gwynedd / Eifionydd, GB-WLS

Dwyfor / Dwyfach

The Afon Dwyfor river flowing below the bridge at Llanystumdwy, Gwynedd, Wales, lined with trees.

Upland headwaters define this river.

Tomorrow · Slow going — better windows ahead
Elk Hair Caddis
Forecast · Tomorrow
Slow going — better windows ahead
Little in your favour today. Fish the certain lies, or leave it for a better one.
40% projected
Today's fly
Elk Hair Caddis
Elk Hair Caddis
Conditions on the water · Tomorrow
Live gauge
Level
Rising
0.35 m
Lifting fast
Water temp11.6°C
ClarityUnfishable
Weather12°C
WindN 18 km/h
Pressure1024 hPa
Rain · recent0.4 mm
Rain · ahead18.9 mm

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

Water temperature for Atlantic Salmon
Ideal
12°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly autumn. Fish on the drop after rain — 12 to 24 hours into a falling spate.
Where
Lower Dwyfor pools above the tidal limit near Llanystumdwy.
Method
Small doubles 10 to 12 across-and-down on a floating line; small tubes on a sink-tip in spring or coloured water. Fish the named lies in each pool, working systematically before moving on. Mandatory catch-and-release under NRW byelaw — every salmon goes back.
Kit
10 ft #7/8 single-hander or 11 ft switch — small spate scale; double-handers are wasted on these rivers. Floating line plus light sink-tip. 10 to 12 lb fluoro tippet.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Stoneflies
Gammarids
Hatch timeline · tomorrowPeak at 6pm

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 43%
Also:Black Gnat37%Autumn Olive28%
Peak emergence windowWeather boost7 food groups active

Peak activity at 6pm — Caperer (Caperer, Weather boost)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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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 · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Sea trout runRun
1
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2

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

Ranked for today
Atlantic Salmon fly box

Wild-river first principles. Early-season nymphs and practical searching, then dry flies, emergers and spiders as hatches and surface activity improve.

What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Glaslyn
14 km
Brown trout · Salmon · Sea trout
Artro
14 km
Brown trout · Salmon · Sea trout
Dwyryd
19 km
12
Brown trout · Salmon · Sea trout
Afon Prysor
22 km
Brown trout
Seiont
25 km
Brown trout · Salmon · Sea trout
Gallery · 2
  1. The Afon Dwyfor river flowing below the bridge at Llanystumdwy, Gwynedd, Wales, lined with trees.
    Afon Dwyfor below Pont Llanystumdwy, Gwynedd, Wales.
  2. Terrain map of the venue
    Terrain map
About this water

Upland headwaters define this river. Atlantic salmon are under serious conservation pressure — Natural Resources Wales mandates catch-and-release for salmon on all rivers, so all fish must be returned. The Dwyfor drops out of Cwm Pennant under Cnicht and the Moelwynion and runs to Cardigan Bay near Cricieth; the Dwyfach joins from the north-east before the tidal stretch. Mountain and moorland country, rain-fed and acidic in its upper reaches. NRW's catchment work has been blunt about the pressures — abstraction, acid flushes, mine legacy — and the sewin trend is downward. Honest sport in the right water; not a guarantee.

Sea trout here

Summer-autumn runs (June–September), primarily nocturnal

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

NRW (Wales) · UKGB110065053730

Why this score · for Atlantic Salmon
  • Temperature10030% weight
  • Flow6025% weight
  • Clarity9520% weight
  • Feeding Time2515% weight
  • Pressure8510% weight
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon 1 April → 17 October
  • Sea trout 3 March → 17 October
  • Trout 3 March → 30 September

Sea trout: Variable seasonal (2026) — NRW 2024 catchment summary classifies sea trout as at risk with a downward trend. Acid flushes, abstraction regulation, and small-catchment volatility all bear on the runs. Honest small-river sport when conditions align — not a destination.

Related guides
Atlantic Salmonsalmon tacticsYorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
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