Spate · Mixed · South West Wales / Pembrokeshire

Eastern Cleddau

Eastern Cleddau terrain map
Terrain map

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

Prime · Brown Trout
CDC Emerger · 16-18
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.
75% confidence
What moved it
  • Level0.67 m
  • Water temp15.5°C
  • ClarityClear
Today’s fly
CDC Emerger
CDC Emerger16-18
Upstream dry, in the film
Conditions on the water
Live gauge
Level
Steady
0.67 m
Water temp15.5°C
ClarityClear
Weather13°C
WindNW 15 km/h
Pressure1023 hPa
Rain · recent8.1 mm
Rain · ahead1.8 mm

Live readings — water temperature is an estimate where the gauge does not record it.

Water temperature for brown trout
Ideal
16°C est.ideal 1016°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 working for you, but time of day is the limiting factor today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · July 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
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
BB
Black Beetle
14-18 · Pattern
Upstream dry, on top
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.
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.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
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

  • Mixed
  • Partly confined
  • Pool riffle
Water quality (WFD)
  • EcologyModerate
  • ChemicalUnknown
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 75%
How the 80 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 activity52 × 12%6.2
Conditions total= 80
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
  • Salmon1 April → 17 October
  • Trout3 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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