Spate · Mixed · South West Wales / Pembrokeshire, GB-WLS

Eastern Cleddau

The Eastern Cleddau river seen from Llawhaden Bridge, Pembrokeshire, Wales

Small Pembrokeshire spate river (4-hour response) with summer sea trout focus.

Prime · Brown Trout
Hare's Ear Nymph · 12-16
Primelive now
About as good as it gets
River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% confidence
What moved it
  • Level0.63 m
  • Water temp15.3°C
  • ClarityClear
Today's fly
Hare's Ear Nymph
Hare's Ear Nymph12-16
Upstream, sub-surface
Conditions on the water
Live gauge
Level
Steady
0.63 m
Water temp15.3°C
ClarityClear
Weather18°C
WindSE 39 km/h
Pressure1008 hPa
Rain · recent5.3 mm
Rain · ahead26.3 mm

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

Water temperature for Brown Trout
Ideal
15°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
Excellent — water temperature is right today, though time of day could be better.
Likely species
Hatch timeline · todayPeak at 11am

Hatch predictions

Today's headline hatch shown — see all 12 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 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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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
Salmon runRun
1
2
2
2
2
2
1
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

Shrimp fly theme — fished swing, wet_fly_swing

Beats · 2
Pembrokeshire AA — Eastern & Western Cleddau, day ticket via Fishing PassportAccess varies
Fifteen miles of prime fishing on the Western Cleddau and its tributaries, plus beats on the Eastern Cleddau — held by the long-established Pembrokeshire Anglers Association.
Visit official site ↗
The Bont — day ticket via Fishing PassportAccess varies
Three quarters of a mile on the Eastern Cleddau — single-bank fishing for sewin, salmon and brown trout, with twenty-two named lies and pools.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
  1. The Eastern Cleddau river seen from Llawhaden Bridge, Pembrokeshire, Wales
    Eastern Cleddau at Llawhaden
  2. Terrain map of the venue
    Terrain map
About this water

Small Pembrokeshire spate river (4-hour response) with summer sea trout focus. Night fishing for sewin (sea trout) productive in summer. Less well known than big West Wales rivers but productive when conditions are right. Fish sinking-tip with small wets for night fishing. Tight window; wait for suitable water and be ready. Atlantic salmon are under serious conservation pressure — Natural Resources Wales mandates catch-and-release for salmon on all rivers, so all fish must be returned.

Under the surface

The Eastern Cleddau rises in the foothills of the Preseli hills and runs some twenty-two miles south-west through the Pembrokeshire countryside — the last four of them tidal — before it joins its western twin to form the great drowned valley of the Daugleddau. The name comes from the Welsh for sword, for the way the two rivers have cut their channels through west Wales. It is a fast, natural, fly-fisher's river: clear water tumbling over rock and gravel through wooded and farmed country, quick to rise and fall with the rain off the Preselis. The Cleddau is sewin water above all — a strong run of sea trout from mid-May, the larger fish early, with an autumn run of salmon behind them. A Special Area of Conservation along its length, it holds lamprey, otter and water-crowfoot. Wading is steady on rock and gravel beneath wooded banks.

Wading: Wooded banks over uneven rock

Sea trout here

Summer-autumn runs (June–September), primarily nocturnal

  • Mixed
  • Partly confined
  • Pool riffle
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

NRW WFD Cycle 3 — Eastern Cleddau (conf with Syfynwy to tidal limit): Moderate ecological status; The Bont/Llawhaden beats. Corrected 2026-06-18 from a Western-Cleddau tributary tag (Cartlett Brook). NB the stored coordinates sit in the Western Cleddau cluster and should be moved to the Eastern Cleddau beats. Source: NRW DataMapWales WFD Cycle 3 classification layer.

NRW (Wales) · GB110061030670

The full read · show the working · for Brown Trout · confidence 90%
How the 85 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity73 × 12%8.8
Conditions total= 85
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 1 April → 17 October
  • Trout 3 March → 30 September

Sea trout: Variable seasonal (2026) — NRW At Risk classification. Small Pembrokeshire spate river. Sea trout present in summer but stocks are marginal; classified At Risk. Night fishing after summer spates is the productive approach.

Salmon: Negligible (2026) — NRW / EA 2024 Salmon Stocks Assessment classifies this Welsh principal salmon river 'at risk' — egg deposition below Conservation Limit. All Wales byelaws (in force 2020-2030) make catch & release mandatory. Conservation priority; not a salmon fishing destination. The Cleddau (Eastern + Western) is at risk; salmon now scarce.

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