Spate · Slate Shale Snowdonia · Wales / Snowdonia (Trawsfynydd)

Afon Prysor

Prysor is a small Snowdonia spate river above Trawsfynydd Lake — narrow water with a good head of wild brown trout to a pound and a half, two short Passport beats, mostly double bank.

Species

A proper day on the water

Low and clear — careful approach country. Stay small, stay accurate.

90% confidence in this read
Water temperature for brown trout
Cool — slow
9°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature8028% weight
  • Flow6022% weight
  • Clarity9518% weight
  • Feeding Time7013% weight
  • Pressure807% weight
  • Insect activity5312% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
8.9°C
Estimated
Clarity
Clear
Air temp
10°C
Wind
SW 36 km/h
Fresh breeze
Pressure
992 hPa
Rain · 48h
1.9 mm
No meaningful rain
Rain · ahead
28.7 mm
Heavy rain · next 48h

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

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
Good — water clarity is right today, though insect activity could be better.
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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.

Beats & Access · 1
Check the current rules, permits and access before travelling.
Afon Prysor — Beats 1 & 2 via Fishing PassportMultiple landowners (via Fishing Passport)
Wild brown troutFlyUpstream dry and nymph
Two short day-ticket beats on the Prysor above Trawsfynydd — Beat 1 (1 mile, double bank) and Beat 2 (1½ miles, double bank), £10/day each. Wild brown trout to 1.5 lb. Small-water tactics — short rod, small flies, slow approach.
Day £10 per beat. EA/NRW rod licence required. All-Wales trout byelaw.
Arrange access →
Directions
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About this water

Prysor is a small Snowdonia spate river above Trawsfynydd Lake — narrow water with a good head of wild brown trout to a pound and a half, two short Passport beats, mostly double bank. Properly small fishing on rocks and pockets; six-foot rod, dry-dropper, and a willingness to fish slowly. The kind of river you fish on the way somewhere else and remember after.

  • Slate shale snowdonia
Seasons & zones
  • Trout3 March → 30 September
Other water nearby · 5