Stillwater · Acidic · County Down, GB-NIR

Silent Valley Reservoir

Silent Valley Reservoir — Silent valley - Northern Ireland

Silent Valley is a different animal from the little put-and-take lakes — an upland reservoir up in the Mournes, lying over acidic granite, holding both rainbows and wild-spirited brown trout.

Fair · Rainbow
Perch Fry · 8-10_long_shank
Fairlive now
Reasonable autumn fishing likely at Silent Valley Reservoir
Useful ripple, fishable wave. Worth a session if the wind holds.
61% confidence

Silent Valley Reservoir is often best in spring through autumn.

What moved it
  • WindE 28 km/hModerate breeze
Today's fly
Perch Fry
Perch Fry8-10_long_shank
Retrieve
Conditions on the water
Estimate
Wind
Moderate breeze
E 28 km/h
N
E
from the east
Wave60 cm wave
Water temp11.4°C
Air temp13°C
CloudOvercast
Pressure1003 hPa
Rain · recent0.0 mm

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

Head to
Wind driftW wind
Eastern end

A westerly has held for 12 hours at much the same temperature as the 11°C water. No thermal steer either way, but the drift still stacks food against the eastern end — the bank it is blowing into — so start there. This reads the upper water, though — a bottom bait at range feels it far less than a floater or a fish in the margins. Treat it as a tiebreaker between good swims rather than an override — features and angling pressure usually count for more.

How to fish it · for Rainbow
When
The buzzer is on at Silent Valley Reservoir.
Where
Start with Perch Fry (8-10_long_shank) — on the point. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
The plan
Plan A

Start with Perch Fry (8-10_long_shank) — on the point. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.

Plan B

If the main plan stalls, drop to a size 14–16 midge — switch to a washing-line or suspender rig and try different depths before you change food group.

Watch for

Sedge should come on through the afternoon as the water warms.

Bank

Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Daphnia SwarmHatch
2
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1

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

Ranked for today
Rainbow fly box
What's coming
Plan ahead
5-day outlook
Condition match
57%
Cloud50%
Wind30%
Temp100%

A reasonable day here, though wind isn't quite in the sweet spot.

Other water nearby · 5
Spelga Reservoir
6.0 km
Brown trout
Castlewellan Forest Lake
15 km
Brown trout · Rainbow trout
River Lagan
25 km
Brown trout
Ballymascanlan River
27 km
Brown trout · Sea trout
Lough Money
28 km
Rainbow trout
Gallery · 2
  1. Silent Valley Reservoir — Silent valley - Northern Ireland
    Silent valley - Northern Ireland
  2. Terrain map of the venue
    Terrain map
About this water

Silent Valley is a different animal from the little put-and-take lakes — an upland reservoir up in the Mournes, lying over acidic granite, holding both rainbows and wild-spirited brown trout. Acidic water tends to run clear and a little sparse, and the fishing has a wilder, more exposed feel for it. This is wind-and-light fishing: the trout come on when a ripple breaks up the surface and cloud takes the glare off, and go quiet when the reservoir lies flat and bright under a high sun. Buzzers and bloodworm work the cool water early; come summer there's enough damsel and sedge to fish nearer the top. The brown trout especially want a careful, unhurried approach. Open upland water that asks you to read the day — the breeze, the cloud, the temperature — rather than just turning up and casting.

  • Reservoir
  • Acidic
Why this score
  • Wind conditions (windy) are not ideal for this water.
  • Temperature (cool) is in the sweet spot for autumn fishing.
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
  • Reservoirs of this kind fish hard at this time of year.
Related guides
Irish Loughs Playbooklough-style fishingBig Stillwater Playbookreservoir tacticsReservoir Entomologymatching the hatch
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