Spate · Mixed · Co. Donegal / Foyle System (border)

River Finn

River Finn venue image
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The Finn is the largest tributary of the Foyle system, rising in the Blue Stack Mountains of Donegal and flowing east to join the Mourne at Strabane.

Species

Marginal — persistence required

Low and clear — careful approach country. Hard going on bright water. Favour cloud and shadow.

50% confidence in this read
Water temperature for atlantic salmon
Cool — slow
6°C est.ideal 10–14°C
0°14°28°
Why this score · for atlantic salmon
  • Temperature1930% weight
  • Flow4525% weight
  • Clarity9520% weight
  • Feeding Time1015% weight
  • Pressure8510% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
6.0°C
Estimated
Clarity
Clear
Air temp
5°C
Wind
SW 15 km/h
Gentle breeze
Pressure
1005 hPa
Rain · 48h
0.2 mm
No meaningful rain
Rain · ahead
19.4 mm
Moderate rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

How to fish it · for atlantic salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Poor conditions. Clarity is favourable (95), Feeding time is weakest (10).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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

Gallery · 1
  1. Terrain map of the venue
    Terrain map
Directions
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About this water

The Finn is the largest tributary of the Foyle system, rising in the Blue Stack Mountains of Donegal and flowing east to join the Mourne at Strabane. A powerful spate river with excellent salmon and sea trout. The river has both Republic (upper) and Northern Ireland (lower) sections — the Loughs Agency manages the fishery across the border. Salmon run from March with grilse from June. Sea trout from May. One of the most productive salmon rivers in the Foyle system. Day permits from Loughs Agency.

  • Mixed
Seasons & zones
  • Salmon1 March → 15 September

Sea trout: Variable seasonal (2026)

Other water nearby · 5
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