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.
Marginal · Brown Trout
Coch-y-Bonddu Beetle · 10-14
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp19.3°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 temp19.3°C
ClarityClear
Weather20°C
WindW 13 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead1.4 mm

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

Water temperature for Brown Trout
Warm — slow
19°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 19.3°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

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 · August 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
Cooler water nearby · 1
Water here around 19°C — probably warm enough to stress Brown Trout . These are likely cooler.
Vyrnwy
8.0 km
~11°C
Brown trout · Grayling · Salmon
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
The full read · show the working · for Brown Trout · confidence 80%
How the 32 is built — score × weight = contribution
Temperature35 × 28%9.8
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity56 × 12%6.7
Conditions total= 58
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
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
Casting instructors near here
Booking & contacts