Spate · Slate · North West Wales / Gwynedd / Eryri

Dwyryd

No photos yet for this water.

Rainy mountainous country above Maentwrog and Blaenau Ffestiniog, draining to Tremadog Bay through the broad tidal flats below Penrhyndeudraeth.

Species

Marginal — persistence required

River steady at a fishable height. Cover the water properly, fish each lie once.

40% confidence — limited data
Water temperature for atlantic salmon
Cool — slow
10°C est.ideal 10–14°C
0°14°28°
Why this score · for atlantic salmon
  • Temperature9330% weight
  • Flow8025% weight
  • Clarity1520% weight
  • Feeding Time1015% weight
  • Pressure8510% weight
Conditions
Level
0.67 m
Water temp
9.7°C
Estimated
Clarity
Very coloured
Colouring up
Air temp
16°C
Wind
E 9 km/h
Light breeze
Pressure
1030 hPa
Rain · 24h
0.0 mm
No rain
Rain · ahead
0.0 mm
No meaningful rain · next 48h

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

How to fish it · for atlantic salmon
When
Mainly summer through autumn. Fish 6 to 12 hours into the drop after rain or a hydro release.
Where
Lower Dwyryd pools above the tide at Maentwrog and below.
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
Poor conditions. Temperature is favourable (93), Feeding time is weakest (10).
Through the year
0–3 scale · May 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
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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

Directions
Apple MapsGoogle Maps
About this water

Rainy mountainous country above Maentwrog and Blaenau Ffestiniog, draining to Tremadog Bay through the broad tidal flats below Penrhyndeudraeth. Slate, conifer, and hydro — the modern Dwyryd is what's left when an Eryri spate river spent the twentieth century being engineered around. The lower pools fish well after water; hydro releases shape the response as much as natural rainfall.

  • Slate
Seasons & zones
  • Salmon1 April → 17 October
  • Sea trout3 March → 17 October
  • Trout3 March → 30 September

Sea trout: Variable seasonal (2026) — Both salmon and sea trout classified at risk by NRW with a downward sewin trend. Hydroelectric flow modification, slate legacy and acid flushes from conifer plantation all shape the runs. Honest spate sport when the water is right.

Other water nearby · 5