Spate · Slate · Mid Wales / Gwynedd-Powys

Dovey (Dyfi)

The historic Pont Minllyn packhorse bridge across the River Dyfi at Dinas Mawddwy, water visible beneath the arch.
Contributor photo

River Dyfi at Pont Minllyn, Dinas Mawddwy

Tk420 - CC BY-SA 4.0

Mid Wales spate river flowing into Cardigan Bay — salmon (spring and strong late-season autumn runs) and sea trout from June onwards.

Good · Brown Trout
CDC Emerger · 16-18
Goodlive now
A proper day on the water
River steady at a fishable height. A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
75% confidence
What moved it
  • Level0.99 m
  • Water temp16.4°C
  • ClarityClear
Today’s fly
CDC Emerger
CDC Emerger16-18
Upstream dry, in the film
Conditions on the water
Live gauge
Level
Steady
0.99 m
Water temp16.4°C
ClarityClear
Weather15°C
WindW 8 km/h
Pressure1022 hPa
Rain · recent3.7 mm
Rain · ahead6.7 mm

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

Water temperature for brown trout
Warm — slow
16°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the open trout season. Spring olives April through May; sedges through summer; small dark flies into autumn close.
Where
Pool tails and pocket water through the Mid Wales valley. Cambrian Mountains freestone, intimate scale.
Method
Upstream dry to risers; dry-dropper through the riffles. North Country spider on the swing in cooler water. Spate-driven on falling water.
Kit
9 ft #4 — Welsh freestone default. Floating line, 9 to 12 ft leader to 4 to 5 lb fluoro. Studded boots — slate slabs run slick.
Why this works
Good — water clarity 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 7 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
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
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Dysynni
8.0 km
Brown trout · Salmon · Sea trout
Mawddach
18 km
Brown trout · Salmon · Sea trout
Rheidol
24 km
Brown trout · Salmon · Sea trout
Afon Eden (Welsh)
24 km
84
Brown trout
Ystwyth
28 km
Brown trout · Salmon · Sea trout
Gallery · 6
  1. The historic Pont Minllyn packhorse bridge across the River Dyfi at Dinas Mawddwy, water visible beneath the arch.
    River Dyfi at Pont Minllyn, Dinas Mawddwy
  2. The River Dovey seen from the A487 road in Ceredigion, Wales, in spring.
    River Dovey from the A487
  3. The River Dyfi flowing through the Machynlleth reach with the Cambrian railway line in the landscape.
    The River Dyfi, Machynlleth
  4. The River Dovey upstream of the Pont ar Ddyfi road bridge at Machynlleth in winter.
    River Dovey upstream of Pont ar Ddyfi
  5. The Afon Dyfi flowing past a bridge near Machynlleth with Welsh hills in the background.
    Afon Dyfi near Machynlleth
  6. Terrain map of the venue
    Terrain map
About this water

Mid Wales spate river flowing into Cardigan Bay — salmon (spring and strong late-season autumn runs) and sea trout from June onwards. Responsive in 5 hours; fish on the rise and drop. Good late-season salmon October–November. Fish sinking-tip with medium tubes in spring, smaller wets for summer sea trout. The Dovey estuary is a Special Area of Conservation. Estuary concentrates migratory fish. Slate and schist bedrock underlie this river. 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.

  • Slate
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

NRW (Wales) · UKGB110064048390

The full read · show the working · for brown trout · confidence 75%
How the 76 is built — score × weight = contribution
Temperature90 × 28%25.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity48 × 12%5.8
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
Apple MapsGoogle Maps
Seasons & zones
  • Salmon20 March → 17 October
  • Trout3 March → 30 September

Sea trout: Variable seasonal (2026) — NRW At Risk classification. Mid Wales sea trout river with runs from June but stocks have declined as part of the wider Welsh pattern. Condition-sensitive — post-rain windows are the reliable opportunity.

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 Dyfi (Dovey) salmon and sewin runs have both declined sharply.

Related guides
Yorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
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