Lowland · Mixed · East / Meath

Nanny & Delvin Rivers

Nanny & Delvin Rivers terrain map
Terrain map

Two small east-coast rivers — the Nanny running through Duleek and Julianstown to the sea at Laytown, the Delvin reaching it near Balbriggan.

Prime · Brown Trout
Pheasant Tail Nymph · 14-18
Primelive now
About as good as it gets
River high but settled. Coloured water — fish bigger and deeper, confident takes down the seams.
80% confidence
What moved it
  • LevelProxyvia Boyne
  • Water temp12.2°C
  • ClarityClear
Today’s fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
Upstream
Conditions on the water
Proxy gauge
Level
Falling
Proxy
via Boyne
Water temp12.2°C
ClarityClear
Weather23°C
WindE 18 km/h
Pressure1014 hPa
Rain · recent0.0 mm
Rain · ahead9.6 mm

No gauge on this water — conditions are inferred from Boyne. The trend transfers, the absolute level does not.

Water temperature for brown trout
Ideal
12.2°Cideal 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 right today, though insect activity could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.

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Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
Terrestrial BeetlesHatch
2
3
3
2
Blue Winged OliveHatch
1
2
2
2
2
1
Black MidgeHatch
1
2
2
2
2
2
2
2
2
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
About this water

Two small east-coast rivers — the Nanny running through Duleek and Julianstown to the sea at Laytown, the Delvin reaching it near Balbriggan. Each holds a stock of wild brown trout and takes a run of sea trout from late May into summer. The best of the Nanny's trout water is Julianstown up to above Balrath Bridge, fly-only above Bellewstown Bridge. Duleek Anglers and Drogheda & District Anglers hold most of the Nanny; the Delvin is largely riparian-owner water, so enquire locally.

  • Mixed
The full read · show the working · for brown trout · confidence 80%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 85
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowproxy via Boyneproxy
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout15 February → 30 September
Related guides
Booking & contacts