Lowland · Mixed · East / Meath, IE

Nanny & Delvin Rivers

Nanny & Delvin Rivers 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.

Poor · Sea Trout
Black & Silver Tube · 1–2 inch
Closed season
Out of season. File this water for the right month.
Closed — confidence not applicable today.
What moved it
  • Level0.79 m
  • Water temp7.6°C
  • ClarityClear
Today's fly
BS
Black & Silver Tube1–2 inch
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
Conditions on the water · Tomorrow
Live gauge
Level
Steady
0.79 m
Water temp7.6°C
ClarityClear
Weather3°C
WindN 13 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Sea Trout
Cool — slow
8°C est.ideal 8–15°C
0°14°28°
How to fish it · for Sea Trout
When
From dusk into the first half of the night.
Where
Deeper pools and slower glides · hold water and current seams.
Method
Fish dark patterns on a sink-tip or lightly sunk line, especially near structure.
Kit
10 ft #6/7 rod, floating line with a sink-tip option, 8–10 lb fluoro tippet for the swing.
Likely species
Stoneflies
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

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Evidence
Survey-backed · regionalHigh confidence

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

Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
1
Mayfly (Green Drake)Hatch
2
2
Large Cinnamon SedgeHatch
2
3
3
2
Daddy Long LegsHatch
2
3
3
2
CapererHatch
2
3
3
2

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

Ranked for today
Sea Trout fly box
BS
Black & Silver TubeTop
1–2 inch · Tube
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
Medicine Fly
Medicine Fly
8–12 · Streamer
Slim and mobile — fished sunk through the pool when surface work is not producing. Consistently takes fish that will not come to the surface.
SF
Snake Fly (Black)
2–4 inch · Streamer
A mobile eel-like profile that undulates through deep pools — effective when sea trout are lying deep and not responding to conventional wets.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Boyne
17 km
0
Brown trout · Salmon · Sea trout
Courtlough Trout Fishery
18 km
Rainbow trout
Broadmeadow & Ward Rivers
21 km
Brown trout
Rathbeggan Lakes
22 km
Rainbow trout
River Dee (Louth)
24 km
Brown trout
About this water

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.

Hatches & food

Two small limestone-based east-coast rivers with modest olive and sedge hatches for the resident trout; summer fishing pivots to flood-run sea trout taking sedges and terrestrials in the tidal lower reaches.

  • Mixed
Why this score · for Sea Trout
  • Temperature10028% weight
  • Flow8022% weight
  • Clarity8518% weight
  • Feeding Time5513% weight
  • Pressure857% weight
  • Insect activity6112% weight
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 15 February → 30 September

Sea trout: Variable seasonal (2026)

Related guides
ConnemaraIrish fishingEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts
Permits & access
At a glance

Nanny & Delvin Rivers is a lowland river in East / Meath, Ireland. It sits at about 50 m above sea level. Species listed for this water: brown trout and sea trout. The trout season is recorded as running from 15 February to 30 September. Core methods listed: upstream dry fly; upstream nymph; floating-line wet fly for sea trout (night). Level and flow data for this water is linked from 1 gauge. Nearby waters in our listings include Boyne at 17 km, Courtlough Trout Fishery at 18 km and Broadmeadow & Ward Rivers at 21 km.