Limestone · East / Kildare

Rye Water

Rye Water terrain map
Terrain map

A Liffey tributary on IFI's Dublin trout-river list — small-stream wild brown trout fishing on the Kildare limestone plain, joining the Liffey at Leixlip.

Marginal · Brown Trout
Pheasant Tail Nymph · 14-18
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp20.3°C
  • ClarityClear
Today’s fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
Upstream
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp20.3°C
ClarityClear
Weather24°C
WindNE 14 km/h
Pressure1019 hPa
Rain · recent0.4 mm
Rain · ahead0.0 mm

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

Water temperature for brown trout
Warm — slow
20°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 20.3°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 9 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
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Leixlip & District Angling Association manages the Sandford's Bridge → Leixlip Aqueduct stretch — day tickets from Leixlip Amenities Centre, Collinstown
  • Carton Estate / Maynooth reach has patchy riparian access
  • State rod licence required for salmon/sea trout.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 20°C — probably warm enough to stress brown trout. These are likely cooler.
River Tolka
17 km
18.8°C
Brown trout
About this water

A Liffey tributary on IFI's Dublin trout-river list — small-stream wild brown trout fishing on the Kildare limestone plain, joining the Liffey at Leixlip. Brown trout average around 10 oz with fish to 3 lb taken annually; good olive and sedge hatches, especially in spring. Access is patchy: the principal day-ticket stretch from Sandford's Bridge down to the Leixlip Aqueduct is managed by Leixlip & District Angling Association, with tickets via the Leixlip Amenities Centre. The Carton Estate / Maynooth reach has the best holding water but riparian access is limited. The kind of tributary an angler learns over a season rather than turns up to cold.

  • Limestone
Water quality (WFD)
  • Ecology: Unknown
  • Chemical: Unknown
The full read · show the working · for brown trout · confidence 80%
How the 26 is built — score × weight = contribution
Temperature21 × 28%5.9
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Limiting factor: Water temperature (20.3°C) is outside Brown Trout's preferred range (10–16°C)= 58
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout1 March → 30 September
Related guides
ConnemaraIrish fishingEuro Nymphingsubsurface methods
Booking & contacts