Lowland · Mixed · Co. Down, GB-NIR

River Lagan

River Lagan venue image

The Lagan rises near Slieve Croob and runs through Dromore and Moira to Belfast; the wild brown-trout fishing is on the upper river around Dromore (DADAC water), not the urban lower reaches.

Prime · Brown Trout
Pheasant Tail Nymph · 14-18
Primelive now
About as good as it gets
River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% confidence
What moved it
  • LevelProxyvia Six Mile Water
  • Water temp14.4°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
Upstream
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Six Mile Water
Water temp14.4°C
ClarityClear
Weather13°C
WindS 21 km/h
Pressure1015 hPa
Rain · recent2.9 mm
Rain · ahead1.1 mm

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

Water temperature for Brown Trout
Ideal
14°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 — water temperature is right today, though time of day could be better.
Likely species
Mayflies
Caddisflies
Gammarids
Hatch timeline · todayPeak at 11am

Hatch predictions

Today's headline hatch shown — see all 12 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 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 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 · September 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
2
CapererHatch
2
3
3
2

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
Castlewellan Forest Lake
12 km
Brown trout · Rainbow trout
Hillsborough Lake
12 km
Rainbow trout
River Shimna
18 km
Brown trout · Salmon · Sea trout
Lough Money
18 km
Rainbow trout
Spelga Reservoir
21 km
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The Lagan rises near Slieve Croob and runs through Dromore and Moira to Belfast; the wild brown-trout fishing is on the upper river around Dromore (DADAC water), not the urban lower reaches. DAERA rod licence plus club permit/day ticket required.

Hatches & food

No venue-specific hatch data yet; as a lowland main-stem river, expect the mixed upwing, sedge and midge activity typical of larger Ulster lowland rivers rather than a confirmed hatch here — a general expectation only.

  • Mixed
The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity72 × 12%8.6
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Six Mile Waterproxy
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
  • Trout 1 March → 31 October
Related guides
ConnemaraIrish fishingEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts