- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110065053520
Rules at a glance
- Free fishing
- Fly only
Water temperature for Atlantic Salmon
Warm — slow21°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly summer through autumn. Fish 6 to 12 hours into the drop after rain or a hydro release.
Where
Lower Dwyryd pools above the tide at Maentwrog and below.
Method
Small doubles 10 to 12 across-and-down on a floating line; small tubes on a sink-tip in spring or coloured water. Fish the named lies in each pool, working systematically before moving on. Mandatory catch-and-release under NRW byelaw — every salmon goes back.
Kit
10 ft #7/8 single-hander or 11 ft switch — small spate scale; double-handers are wasted on these rivers. Floating line plus light sink-tip. 10 to 12 lb fluoro tippet.
Why this works
Water at 21.2°C. This is the line where catch-and-release kills atlantic salmon. Do not fish for them today.
Hatch timeline · todayPeak at 6pm
Hatch predictions
Today's headline hatch shown — see all 6 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Sea trout 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
Atlantic Salmon fly box
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Probably above the Atlantic Salmon safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
Afon Dwyryd at Maentwrog Terrain map
Water quality (WFD)
Why this score · for Atlantic Salmon
- Temperature130% weight
- Flow6025% weight
- Clarity020% weight
- Feeding Time8515% weight
- Pressure8510% weight
Directions
Seasons & zones
- Salmon 1 April → 17 October
- Sea trout 3 March → 17 October
- Trout 3 March → 30 September
Sea trout: Variable seasonal (2026) — Both salmon and sea trout classified at risk by NRW with a downward sewin trend. Hydroelectric flow modification, slate legacy and acid flushes from conifer plantation all shape the runs. Honest spate sport when the water is right.
Related guides
Casting instructors near here
Booking & contacts
Dwyryd
Water temperature for Atlantic Salmon
Warm — slow21°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Mainly summer through autumn. Fish 6 to 12 hours into the drop after rain or a hydro release.
Where
Lower Dwyryd pools above the tide at Maentwrog and below.
Method
Small doubles 10 to 12 across-and-down on a floating line; small tubes on a sink-tip in spring or coloured water. Fish the named lies in each pool, working systematically before moving on. Mandatory catch-and-release under NRW byelaw — every salmon goes back.
Kit
10 ft #7/8 single-hander or 11 ft switch — small spate scale; double-handers are wasted on these rivers. Floating line plus light sink-tip. 10 to 12 lb fluoro tippet.
Why this works
Water at 21.2°C. This is the line where catch-and-release kills atlantic salmon. Do not fish for them today.
Hatch timeline · todayPeak at 6pm
Hatch predictions
Today's headline hatch shown — see all 6 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Sea trout 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
Atlantic Salmon fly box
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Probably above the Atlantic Salmon safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
Afon Dwyryd at Maentwrog Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
NRW (Wales) · UKGB110065053520
Why this score · for Atlantic Salmon
- Temperature130% weight
- Flow6025% weight
- Clarity020% weight
- Feeding Time8515% weight
- Pressure8510% weight
Directions
Seasons & zones
- Salmon 1 April → 17 October
- Sea trout 3 March → 17 October
- Trout 3 March → 30 September
Sea trout: Variable seasonal (2026) — Both salmon and sea trout classified at risk by NRW with a downward sewin trend. Hydroelectric flow modification, slate legacy and acid flushes from conifer plantation all shape the runs. Honest spate sport when the water is right.
Related guides
Casting instructors near here
Booking & contacts