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.

Tomorrow · Closed season
Czech Nymph
Forecast · Tomorrow
Closed season
Out of season. Try elsewhere.
90% projected
Today's fly
Czech Nymph
Czech Nymph
Conditions on the water · Tomorrow
Proxy gauge
Level
Steady
Proxy
via Six Mile Water
Water temp8.4°C
ClarityClear
Weather3°C
WindN 11 km/h
Pressure1019 hPa
Rain · recent0.1 mm
Rain · ahead0.0 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
Cool — slow
8°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.
Likely species
Stoneflies
Gammarids
Hatch timeline · tomorrowPeak at 10am

12pm(now) — Black Midge

Stage: On emergersApproach: Emerger or dryActivity: 40%
Also:Autumn Olive37%
Peak emergence windowWeather boost5 food groups active

Peak activity at 10am — Black Midge (Black Midge, Peak emergence window)

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
Brown Trout fly box
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
River Shimna
18 km
0
Brown trout · Salmon · Sea trout
River Lagan — Shaw's Bridge
22 km
0
Brown trout · Salmon
Castlewellan Forest Lake
12 km
Brown trout · Rainbow trout
Hillsborough Lake
12 km
Rainbow trout
Spelga Reservoir
21 km
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

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 75%
How the 0 is built — score × weight = contribution
Temperature77 × 28%21.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 76
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
At a glance

River Lagan is a lowland river in Co. Down, Northern Ireland. It sits at about 60 m above sea level. The river is described as roughly 86 km long. The species listed for this water is brown trout. The trout season is recorded as running from 1 March to 31 October. Core methods listed: upstream dry fly; upstream nymph; wet-fly swing after dark for dollaghan. Access is recorded as a water managed by an angling association or club. Nearby waters in our listings include Castlewellan Forest Lake at 12 km, Hillsborough Lake at 12 km and River Shimna at 18 km.