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.

Marginal · Rainbow
Perch Fry · 8–10 long shank
A patient day, if you fancy it
Glassy and bright — hard work without a breeze. A flat lough is a quiet lough — wait for the breeze.
37% confidence
limited data

Silent Valley Reservoir is often best in spring through autumn.

What moved it
  • WindS 42 km/hStrong breeze
Today's fly
Perch Fry
Perch Fry8–10 long shank
Retrieve
Conditions on the water
Estimate
Wind
Strong breeze
S 42 km/h
N
S
from the south
Wave80 cm wave
Water temp12.3°C
Air temp15°C
CloudOvercast
Pressure992 hPa
Rain · recent0.0 mm

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

Head to
Wind driftS wind
Northern end

A southerly has held for 12 hours at much the same temperature as the 12°C water. No thermal steer either way, but the drift still stacks food against the northern 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
Conditions are not ideal but fishable at Silent Valley Reservoir.
Where
Start with Perch Fry (8–10 long shank) — on the point. Evening can produce explosive surface takes — try a foam beetle or booby on a long leader. Rainbows respond to more active retrieves — try short strips between pauses. The gusts make a boat hard to hold — anchor in the lee or fish the sheltered bank.
The plan
Plan A

Start with Perch Fry (8–10 long shank) — on the point. Evening can produce explosive surface takes — try a foam beetle or booby on a long leader. Rainbows respond to more active retrieves — try short strips between pauses. The gusts make a boat hard to hold — anchor in the lee or fish the sheltered bank.

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

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

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 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 as a supporter.

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Through the year
0–3 scale · October 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.

Buzzer team todayfor the conditions now
Point
Black buzzer, orange thorax
Not in this water's box
#10
How to fish it
Intermediate line · let the breeze drift the team, then hang it 15–30 s

Fly recommendations

Point fly shown — supporters see the whole team, sizes and why.

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Ranked for today
Rainbow fly box
What's coming
Plan ahead
5-day outlook
Condition match
45%
Cloud50%
Wind30%
Temp60%

Conditions are away from Silent Valley Reservoir's sweet spot — it usually fishes best in ripple wind with cloud skies.

Other water nearby · 5
Silent Valley Reservoir
< 1 km
Rainbow trout · Brown trout
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
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 (strong) are not ideal for this water.
  • 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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