Spate · Old Red Sandstone · Wales / Brecon Beacons (Tawe tributary), GB-WLS

Afon Twrch

The Afon Twrch, a small upland river, winding through a moorland valley in the Brecon Beacons

The Twrch is the main tributary of the Tawe — small, double-bank, and known to those who know it as one of the best-kept brown trout secrets in south Wales.

Today · Not the day for it
Gold-Ribbed Hare's Ear
Forecast · Today
Not the day for it
Not much stacked in your favour today. Worth an hour if you are nearby, not worth the special trip.
45% projected
Today's fly
Gold-Ribbed Hare's Ear
Gold-Ribbed Hare's Ear
Conditions on the water · Today
Proxy gauge
Level
Rising
Proxy
via Cothi
Water temp13.3°C
ClarityUnfishable
Weather16°C
WindN 26 km/h
Pressure1016 hPa
Rain · recent2.6 mm
Rain · ahead8.4 mm

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

Water temperature for Brown Trout
Ideal
13°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
Very poor — water temperature is working for you, but water clarity is the limiting factor today.
Hatch timeline · todayPeak at 2pm

12pm(now) — Heather Fly

Stage: Terrestrials on topApproach: Dry flyActivity: 63%
Also:Daddy Long Legs52%Autumn Dun34%Cinnamon Sedge23%
Peak emergence window12 food groups active

Peak activity at 2pm — Autumn Dun (Autumn Dun, 12 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 with Pro.

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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 · September 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
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
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 Twrch — Beats 1 & 2 via Fishing PassportAccess varies
Two short day-ticket beats on the Twrch — Beat 1 (¾ mile) and Beat 2 (½ mile) — both double bank.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Llyn y Fan Fach
10 km
Brown trout
Neath
10 km
Brown trout · Salmon · Sea trout
Tawe
11 km
Brown trout · Salmon · Sea trout
Amman
12 km
Brown trout · Sea trout · Salmon
Abernant Farm Fishery
16 km
Brown trout · Rainbow trout
Gallery · 3
  1. The Afon Twrch, a small upland river, winding through a moorland valley in the Brecon Beacons
    The Afon Twrch winding through moorland above Ystradgynlais
  2. River Twrch looking south downstream from the side of Pen yr Helyg
    River Twrch looking south downstream from the side of Pen yr Helyg
  3. Terrain map of the venue
    Terrain map
About this water

The Twrch is the main tributary of the Tawe — small, double-bank, and known to those who know it as one of the best-kept brown trout secrets in south Wales. Two short Passport beats (¾ mile and ½ mile), seventeen quid a day, five for juniors. The kind of small Brecon Beacons spate water that rewards quiet wading and small flies. The Tawe gets the headlines; the Twrch quietly fishes.

  • Old red sandstone
The full read · show the working · for Brown Trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow95 × 22%20.9
Clarity0 × 18%0.0
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity44 × 12%5.3
Limiting factor: Water is unfishable — too coloured for Brown Trout= 67
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Cothiproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
A drop and clear would lift the flow and clarity scores.
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
Clubs & associations