Spate · Slate · Mid Wales / Gwynedd

Dysynni

No photos yet for this water.

Compact upland-to-coast spate from the eastern flank of Cadair Idris through Tal-y-llyn to Tywyn and the bay.

Species

A good day — worth the effort

Low and clear — careful approach country. Small and bright, long leader, careful approach.

50% confidence in this read
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
  • Flow6025% weight
  • Clarity9520% weight
  • Feeding Time1015% weight
  • Pressure8510% weight
Conditions
Level
0.29 m
Water temp
9.7°C
Estimated
Clarity
Clear
Air temp
16°C
Wind
E 9 km/h
Light breeze
Pressure
1030 hPa
Rain · 48h
0.0 mm
No meaningful 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
Summer through autumn. Fish on the drop after rain — the Dysynni does not give up fish in low water.
Where
Lower Dysynni pools above the tidal limit at Bryncrug and Tywyn.
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 conditions. Clarity is favourable (95), 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
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About this water

Compact upland-to-coast spate from the eastern flank of Cadair Idris through Tal-y-llyn to Tywyn and the bay. Short overall but with proper character — moor water at the top, broader river through the valley, tidal flats at the bottom. Sewin and salmon both run, both classified at risk. The lower river fishes best after a rain pulse drops back into colour; summer low water is for trout and patient observation, not migratory work.

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

Sea trout: Variable seasonal (2026) — NRW At Risk classification. Compact spate river with poor water quality stretches and acid pressure. Honest small-river sport on the right pulse; nothing to fish in flat low summer water.

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