Spate · Mixed · East / Wicklow

Derry Water

Derry Water terrain map
Terrain map

The Derry Water is the eastern headwater of the Aughrim River — a small Wicklow upland stream that meets the Ow at Aughrim village to form the Aughrim.

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
  • LevelLight rain recentlyNo gauge reading
  • Water temp16.9°C
  • ClarityClear
Today’s fly
Partridge and Orange
Partridge and Orange14-16
Upstream
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp16.9°C
ClarityClear
Weather13°C
WindNW 15 km/h
Pressure1023 hPa
Rain · recent7.6 mm
Rain · ahead1.7 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 6 active hatches hour by hour with Pro.

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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
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
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
About this water

The Derry Water is the eastern headwater of the Aughrim River — a small Wicklow upland stream that meets the Ow at Aughrim village to form the Aughrim. Granite and mixed geology, small wild brown trout averaging six ounces, the river is heavily overgrown and rarely fished outside the small local circle. The Aughrim & District Trout Angling & Conservation Club tickets it together with the Ow and the lower Aughrim — three named waters, one connected system.

  • Mixed
The full read · show the working · for brown trout · confidence 75%
How the 74 is built — score × weight = contribution
Temperature79 × 28%22.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity56 × 12%6.7
Conditions total= 74
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