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
Poor · Brown Trout
Partridge and Orange · 14-16
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Cothi
  • Water temp10.6°C
  • ClarityClear
Today's fly
Partridge and Orange
Partridge and Orange14-16
Upstream, in the film
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Cothi
Water temp10.6°C
ClarityClear
Weather6°C
WindN 9 km/h
Pressure1033 hPa
Rain · recent16.5 mm
Rain · ahead2.4 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
11°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.
Likely species
Stoneflies
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 9 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 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
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
Fly box · Brown Trout
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.
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What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Neath
10 km
0
Brown trout · Salmon · Sea trout
Tawe
11 km
0
Brown trout · Salmon · Sea trout
Amman
12 km
0
Brown trout · Sea trout · Salmon
Brynhenllys Fishery
3.0 km
Brown trout
Llyn y Fan Fach
10 km
Brown 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
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Cothiproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
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
Boards & regulators