Stoneflies
Caddisflies
Gammarids
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB111067052060
Rules at a glance
- Day tickets
Water temperature for Brown Trout
Ideal15°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 — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Caddisflies
- Net-spinning caddisMost likelyLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Large sedgesAlso possibleNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · tomorrowPeak at 12 Uhr
12 Uhr(now) — Heather Fly
Stage: Terrestrials on topApproach: Dry flyActivity: 52%
Also:Reed Smut46%Cinnamon Sedge27%Autumn Dun25%
Peak emergence window10 food groups active
Peak activity at 12 Uhr — Heather Fly (Heather Fly, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
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
2
1
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Daddy Long LegsHatch
2
3
2
CapererHatch
2
3
3
2
Hawthorn FlyHatch
2
2
GrannomHatch
2
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Brown Trout
Beats · 5 · 4 reaches
Llangollen & middle Dee — Llangollen Maelor AnglingAccess varies
The Welsh Dee around Llangollen is one of the finest grayling rivers in Europe, host to international championships and the annual Hanak Grayling Festival.
Visit official site ↗Upper Welsh Dee — Bala & District AAAccess varies
Bala & District Angling Association holds beats on the upper Welsh Dee above Llangollen, fishable on day or season ticket from local outlets.
Lower Welsh Dee — Bangor-on-Dee & private beatsAccess varies
The lower Welsh Dee is more salmon and sea trout water, much of it in private and syndicate hands.
Bala-area Dee tributaries · 2 beatsDay rods
River Tryweryn — Bala & District Angling Association, Llafar & Lliw — Bala & District Angling Association
The 2 beats
River Tryweryn — Bala & District Angling AssociationDay tickets
Bala & District Angling Association
Runs off Llyn Celyn reservoir down to join the Dee just below Bala, past the National Whitewater Centre. Dam releases (typically 9-11 cumecs, scheduled around whitewater events) cause rapid, sudden level rises — check the release schedule alongside any gauge reading. No spinning at any time; no fishing in the 27.4m stretch above Tryweryn weir.
Fly and worm only — no spinning, no maggots or ground bait (NRW byelaw). Season 1 March-28/29 February.
Visit official site ↗Llafar & Lliw — Bala & District Angling AssociationDay tickets
Bala & District Angling Association
Two small, narrow, overhung feeder streams into Llyn Tegid (Bala Lake) near Glanllyn — genuinely minor water, fished together on one club ticket. Fishes best in spate; club guidance uses the Dee-at-New-Inn gauge as a rough proxy, since neither stream is directly gauged.
Any legal method except maggots/ground bait (NRW byelaw). Note: there's a second, unrelated River Lliw near Swansea (Loughor system) — this is the Gwynedd one, at the head of Bala Lake.
Visit official site ↗What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 7
The River Dee (Afon Dyfrdwy) at Llangollen, Denbighshire 
River Dee at Llangollen 
River Dee below Bala Lake 
River Dee at Carrog 
The River Dee at Corwen 
River Dee and the Crogen estate Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 90%
How the 89 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity83 × 12%10.0
Conditions total= 89
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Salmon 20 March → 17 October
- Trout 3 March → 30 September
- Grayling 16 June → 14 March
Corwen & District AC lists grayling 16 June – 14 March inclusive. Methods change through the season: fly only 16 June – 17 October; fly or float-trotted worm 18 October – 2 March; fly only again 3–14 March. Check association rules for any additional local variations.
Prime sport 1 September → 31 December
- 16 Jun → 17 Oct · Fly only
- 18 Oct → 2 Mar · Fly or float-trotted worm
- 3 Mar → 14 Mar · Fly only
Sea trout: Variable seasonal (2026) — NRW At Risk classification. North Wales Dee sea trout are present but the river is primarily salmon and brown-trout focused. Stocks have declined alongside the wider Welsh sea trout crisis.
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 Welsh Dee (cross-border with England) has seen sustained salmon decline.
Related guides
Casting instructors near here
Booking & contacts
Clubs & associations
Boards & regulators
Dee (Welsh)
Water temperature for Brown Trout
Ideal15°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 — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Caddisflies
- Net-spinning caddisMost likelyLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
- CapererAlso possibleLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Large sedgesAlso possibleNearest relative#8–10 · AdultBig waked sedge in the last light and after dark.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
Hatch timeline · tomorrowPeak at 12 Uhr
12 Uhr(now) — Heather Fly
Stage: Terrestrials on topApproach: Dry flyActivity: 52%
Also:Reed Smut46%Cinnamon Sedge27%Autumn Dun25%
Peak emergence window10 food groups active
Peak activity at 12 Uhr — Heather Fly (Heather Fly, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
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
2
1
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Daddy Long LegsHatch
2
3
2
CapererHatch
2
3
3
2
Hawthorn FlyHatch
2
2
GrannomHatch
2
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Brown Trout
Beats · 5 · 4 reaches
Llangollen & middle Dee — Llangollen Maelor AnglingAccess varies
The Welsh Dee around Llangollen is one of the finest grayling rivers in Europe, host to international championships and the annual Hanak Grayling Festival.
Visit official site ↗Upper Welsh Dee — Bala & District AAAccess varies
Bala & District Angling Association holds beats on the upper Welsh Dee above Llangollen, fishable on day or season ticket from local outlets.
Lower Welsh Dee — Bangor-on-Dee & private beatsAccess varies
The lower Welsh Dee is more salmon and sea trout water, much of it in private and syndicate hands.
Bala-area Dee tributaries · 2 beatsDay rods
River Tryweryn — Bala & District Angling Association, Llafar & Lliw — Bala & District Angling Association
The 2 beats
River Tryweryn — Bala & District Angling AssociationDay tickets
Bala & District Angling Association
Runs off Llyn Celyn reservoir down to join the Dee just below Bala, past the National Whitewater Centre. Dam releases (typically 9-11 cumecs, scheduled around whitewater events) cause rapid, sudden level rises — check the release schedule alongside any gauge reading. No spinning at any time; no fishing in the 27.4m stretch above Tryweryn weir.
Fly and worm only — no spinning, no maggots or ground bait (NRW byelaw). Season 1 March-28/29 February.
Visit official site ↗Llafar & Lliw — Bala & District Angling AssociationDay tickets
Bala & District Angling Association
Two small, narrow, overhung feeder streams into Llyn Tegid (Bala Lake) near Glanllyn — genuinely minor water, fished together on one club ticket. Fishes best in spate; club guidance uses the Dee-at-New-Inn gauge as a rough proxy, since neither stream is directly gauged.
Any legal method except maggots/ground bait (NRW byelaw). Note: there's a second, unrelated River Lliw near Swansea (Loughor system) — this is the Gwynedd one, at the head of Bala Lake.
Visit official site ↗What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 7
The River Dee (Afon Dyfrdwy) at Llangollen, Denbighshire River Dee at Llangollen River Dee below Bala Lake River Dee at Carrog The River Dee at Corwen River Dee and the Crogen estate Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB111067052060
The full read · show the working · for Brown Trout · confidence 90%
How the 89 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity83 × 12%10.0
Conditions total= 89
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Salmon 20 March → 17 October
- Trout 3 March → 30 September
- Grayling 16 June → 14 March
Corwen & District AC lists grayling 16 June – 14 March inclusive. Methods change through the season: fly only 16 June – 17 October; fly or float-trotted worm 18 October – 2 March; fly only again 3–14 March. Check association rules for any additional local variations.
Prime sport 1 September → 31 December
- 16 Jun → 17 Oct · Fly only
- 18 Oct → 2 Mar · Fly or float-trotted worm
- 3 Mar → 14 Mar · Fly only
Sea trout: Variable seasonal (2026) — NRW At Risk classification. North Wales Dee sea trout are present but the river is primarily salmon and brown-trout focused. Stocks have declined alongside the wider Welsh sea trout crisis.
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 Welsh Dee (cross-border with England) has seen sustained salmon decline.
Related guides
Casting instructors near here
Booking & contacts
Clubs & associations
Boards & regulators