Spate · Mixed · Mid Wales / Powys-Shropshire border (Tanat Valley, Severn/Vyrnwy tributary)

Tanat

A small clear Welsh river flowing over rocks beneath overhanging trees, River Tanat, mid-Wales.
Contributor photo

The river Tanat, mid-Wales

Steve Knight - CC BY 2.0

A remote Berwyn spate stream running off Cyrniau Nod down through Llangynog, Llanrhaeadr-ym-Mochnant and Llangedwyn to join the Vyrnwy near Llansantffraid.

Poor · Brown Trout
Coch-y-Bonddu Beetle · 10-14
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.1°C
  • ClarityClear
Today’s fly
CY
Coch-y-Bonddu Beetle10-14
Upstream dry, on top
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.1°C
ClarityClear
Weather27°C
WindSW 10 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
22°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
⛔ Water at 22.1°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 12pm

Hatch predictions

Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.

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Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Daddy Long LegsHatch
2
3
2
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2

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

Ranked for today
Brown Trout fly box
Beats · 5 · 1 reaches

Only the Horseshoe Inn and Green Inn stretches take casual day tickets; the rest of the river is club water (Upper Tanat FC, Gamefishers' Club, Vale of Clwyd AC), all membership-only.

Tanat day-ticket water · 5 beatsMixed
Upper Tanat Fishing Club, Horseshoe Inn, Llanyblodwel, Green Inn, Llangedwyn, The Gamefishers' Club…
The 5 beats
Upper Tanat Fishing ClubMembers
Upper Tanat Fishing Club
15 named beats on the Tanat (plus 5 on the Vyrnwy) — a members' club running since 1904 with a strong catch-and-release ethic. Classic Berwyn upland spate-stream fishing: remote, fast, and unstocked-feeling, though the club did historically stock some beats. Grayling here were reintroduced rather than a long-established native population.
Full members only — 6 guest tickets/year per member, must be accompanied. 2026 annual subscription £285, no joining fee, waiting list for membership.
Horseshoe Inn, LlanyblodwelDay tickets
Horseshoe Inn, Llanyblodwel
About a mile of day-ticket water at Llanyblodwel, near the England border end of the river — the most accessible stretch for a visiting angler without a club connection.
Day ticket via the pub — confirm current availability by phone.
Green Inn, LlangedwynDay tickets
Green Inn, Llangedwyn
A stretch of the Tanat at Llangedwyn, further upstream than the Horseshoe Inn water.
Day ticket via the pub — confirm current availability by phone.
The Gamefishers' ClubMembers
The Gamefishers' Club
About a mile, mostly double bank, near Llanyblodwel close to the Shropshire border.
Members only.
Vale of Clwyd Angling Club ("Monday Club")Members
Vale of Clwyd Angling Club
Just under a mile from The Mill at Penybontfawr upstream to Glanhafon-fawr near Llangedwyn — the furthest-upstream, closest-to-source club water on the river.
Members only.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. A small clear Welsh river flowing over rocks beneath overhanging trees, River Tanat, mid-Wales.
    The river Tanat, mid-Wales
  2. Terrain map of the venue
    Terrain map
About this water

A remote Berwyn spate stream running off Cyrniau Nod down through Llangynog, Llanrhaeadr-ym-Mochnant and Llangedwyn to join the Vyrnwy near Llansantffraid. Wild brown trout and (reintroduced, now established) grayling are the real fishery here; salmon are a historic spawning presence rather than a current target. Flashy and remote — exactly what you'd expect of an upland Berwyn river.

  • Mixed
The full read · show the working · for brown trout · confidence 90%
How the 12 is built — score × weight = contribution
Temperature6 × 28%1.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity62 × 12%7.4
Limiting factor: Water temperature (22.1°C) is outside Brown Trout's preferred range (10–16°C)= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones

Salmon: Negligible (2026) — A 2005 Wild Trout Trust survey called the club's Tanat holding a major Severn-catchment salmon spawning area (200+ redds counted) and an EA indicator river for the Salmon Action Plan. That's a two-decade-old snapshot; the wider Severn system has since seen an emergency 2019 byelaw and continued stock decline, with Welsh principal salmon rivers broadly classed at risk. Treat the Tanat as a historic spawning tributary, not an active rod fishery.

Related guides
Grayling Playbookgrayling tacticsYorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
Booking & contacts