Lowland · Mixed · Co. Armagh / Lough Neagh Tributaries

River Blackwater (NI)

River Blackwater (NI) terrain map
Terrain map

The Blackwater is a major Lough Neagh tributary flowing through Co.

Good · Brown Trout
Partridge and Orange · 14-16
Goodlive now
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
75% confidence
What moved it
  • LevelModerate rain recentlyNo gauge reading
  • Water temp17.0°C
  • ClarityClear
Today’s fly
Partridge and Orange
Partridge and Orange14-16
Upstream
Conditions on the water
Estimate
Level
Moderate rain recently
No gauge reading
Water temp17.0°C
ClarityClear
Weather14°C
WindNW 13 km/h
Pressure1023 hPa
Rain · recent14.9 mm
Rain · ahead2.1 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
17°C est.ideal 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
Good — water clarity is working for you, but time of day is the limiting factor today.
Hatch timeline · todayQuiet day

Hatch predictions

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

Start free trial

14-day free trial. Cancel anytime.

Evidence
Survey-backed · regionalModerate confidence

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

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
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

The Blackwater is a major Lough Neagh tributary flowing through Co. Armagh — a slow, deep lowland river with excellent brown trout and dollaghan runs. The dollaghan run (July–October) is the main draw. Brown trout are plentiful throughout. The river also holds pike and some coarse fish. Managed by local clubs with day permits. The Blackwater responds slowly to rain — plan for sustained wet weather rather than single showers.

  • Mixed
The full read · show the working · for brown trout · confidence 75%
How the 75 is built — score × weight = contribution
Temperature77 × 28%21.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity62 × 12%7.4
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout1 March → 30 September
Related guides
Booking & contacts