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.

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

Tomorrow · A proper day on the water
Elk Hair Caddis
Forecast · Tomorrow
A proper day on the water
A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
55% projected
Today's fly
Elk Hair Caddis
Elk Hair Caddis
Conditions on the water · Tomorrow
Live gauge
Level
Steady
0.23 m
Water temp12.0°C
ClarityClear
Weather11°C
WindN 23 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Grayling
Ideal
12°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Hatch timeline · tomorrowPeak at 6pm

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 72%
Also:Autumn Olive46%Daddy Long Legs36%
Peak emergence window8 food groups active

Peak activity at 6pm — Caperer (Caperer, 10 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 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
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
Grayling fly box

Traditional wild-trout llyn fishing. Wet flies and dabblers stay central, with buzzer, caddis, terrestrials and occasional small fry patterns becoming important as the season warms.

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.
Visit official site ↗
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.
Visit official site ↗
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.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
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 Grayling · confidence 55%
How the 76 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 76
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
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.

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