Lowland · Mixed · East / Louth-Monaghan

Monaghan Blackwater

Monaghan Blackwater — A river runs through it
Poor · Brown Trout
Pheasant Tail Nymph · 14-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
80% confidence
What moved it
  • LevelProxyvia River Fane
  • Water temp21.1°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
Upstream
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via River Fane
Water temp21.1°C
ClarityClear
Weather22°C
WindSW 12 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead0.4 mm

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

Water temperature for Brown Trout
Warm — slow
21°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
Water at 21.1°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

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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 · August 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
Cooler water nearby · 3
Water here around 21°C — probably warm enough to stress Brown Trout . These are likely cooler.
Emy Lough
10 km
~20°C
Brown trout · Pike
Lough Corry
21 km
~20°C
Brown trout
Annaginny Fishery
36 km
~20°C
Rainbow trout
Gallery · 2
  1. Monaghan Blackwater — A river runs through it
    A river runs through it
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 80%
How the 21 is built — score × weight = contribution
Temperature13 × 28%3.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Limiting factor: Water temperature (21.1°C) is outside Brown Trout's preferred range (10–16°C)= 62
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via River Faneproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 30 September

Sea trout: Variable seasonal (2026)

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