Stillwater · Peat · Co. Antrim / head of the Bush catchment, GB-NIR

Altnahinch Reservoir

Photo of Altnahinch Reservoir

Altnahinch sits in exposed peaty moorland at the head of the Bush system.

Good · Trout
Perch Fry · 8-10_long_shank
Goodlive now
Reasonable autumn fishing likely at Altnahinch Reservoir
Glassy and bright — hard work without a breeze. Take your time — read the water before you cast.
66% confidence

Altnahinch Reservoir is often best in spring through autumn.

What moved it
  • WindSE 44 km/hStrong breeze
Today's fly
Perch Fry
Perch Fry8-10_long_shank
Retrieve
Conditions on the water
Estimate
Wind
Strong breeze
SE 44 km/h
N
SE
from the south-east
Wave80 cm wave
Water temp15.0°C
Air temp14°C
CloudOvercast
Pressure1004 hPa
Rain · recent0.0 mm

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

Head to
Wind driftSE wind
South-eastern end

A southeasterly has held for most of a day, running colder than the water (13°C air against 15°C water). The end it blows into is taking that chilled surface water, so try the sheltered south-eastern end instead — off the back of the wind, where the undertow returns food along the bottom. That chill sits in the top of the water, though, and the bed is slower to feel it — on a bottom bait it is the undertow, not the temperature, that puts you at this end. 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 Trout
When
April–September
Where
Start with Perch Fry (8-10_long_shank) — on the point. 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. If that does not produce, switch depth or speed before changing the pattern entirely.

Plan B

If the daddy is being refused, drop to a hopper or a single foam beetle and cover rising fish individually.

Watch for

Watch for Murrough towards evening — this could be the best window of the day.

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
Trout seasonSeason
1
2
2
2
2
2
2
1
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
2
Claret DunHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2

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

Ranked for today
Trout 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
Gallery · 2
  1. Photo of Altnahinch Reservoir
    Altnahinch Reservoir — image via Wikipedia (Altnahinch Dam)
  2. Terrain map of the venue
    Terrain map
About this water

Altnahinch sits in exposed peaty moorland at the head of the Bush system. It is a classic shore-fishing reservoir in rougher country rather than an easy-access stocked park lake. The official DAERA material explicitly points anglers towards small attractor wets such as Bibio and Peter Ross, which tells you a lot about the venue's practical character.

  • Reservoir
  • Peat
Why this score
  • Wind conditions (strong) are not ideal for this water.
  • Temperature (cool) is in the sweet spot for autumn fishing.
  • Daddy Longlegs are in their seasonal window, boosting the chance of targeted feeding.
  • Reservoirs of this kind fish well at this time of year.
Directions
Seasons & zones
  • Trout 1 March → 31 October
Related guides
Casting instructors near here
Booking & contacts