Spate · Granite · West / Connemara

Invermore

Invermore lough surrounded by Connemara bogland and low hills.

Historically important Connemara sea-trout fishery, documented alongside Owengowla in Gargan et al.

Marginal · Atlantic Salmon
Cascade · 10-14
Marginallive now
Marginal — persistence required
River temperature is the limiting factor today, not the flow. Fish the cool of dawn or dusk, land fish fast, and stop if one struggles to recover.
85% confidence
What moved it
  • LevelProxyvia Erriff
  • Water temp18.5°C
  • ClarityClear
Today's fly
Cascade
Cascade10-14
Regional salmon default — river-specific evidence is thin.
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Erriff
Water temp18.5°C
ClarityClear
Weather18°C
WindNW 20 km/h
Pressure1022 hPa
Rain · recent6.4 mm
Rain · ahead2.3 mm

No gauge on this water — conditions are inferred from Erriff. The trend transfers, the absolute level does not.

Water temperature for Atlantic Salmon
Warm — slow
19°C est.ideal 1014°C
0°14°28°
How to fish it · for Atlantic Salmon
When
All day — lough fishing is best in a good wave. Early morning and evening can produce in calm conditions.
Where
Work the drift lanes from the upwind shore across the productive zones. Cover bay edges, underwater reefs, and any areas where the bottom shoals.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
10 ft #7/8 single-hander, floating line, 10–12 lb fluoro leader. Boat seat and waterproofs for the drift.
Why this works
Water at 18.5°C — above the atlantic salmon caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Likely species
Caddisflies
  • Satin sedgeMost likelyLower confidence
    #12–14 · Egg-laying
    Skitter it at dusk — this one's fished, not dead-drifted.
  • Large sedgesAlso possible
    #8–10 · Adult
    Big waked sedge in the last light and after dark.
Hatch timeline · todayPeak at 8pm

Hatch predictions

Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
1
Daddy Long LegsHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Lake OliveHatch
1
2
2
2
2
2
1

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

Ranked for today
Atlantic Salmon fly box

Connemara/Mayo low water: a lightly-dressed shrimp on a floating line with sink tip, sized down from 8s in cold spring water to 12s and 14s as summer water warms and clears. Where the current runs faster, a slim tube or hairwing swung through tracks better than a shrimp.

Permits & access
Permit required — see local rules.
  • In Galway, Connemara and Ballinakill districts it is an offence to kill sea trout over 40 cm
  • C&R barbless hook rules apply after bag limit
  • State rod licence required.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 19°C — probably warm enough to stress Atlantic Salmon . These are likely cooler.
Gallery · 2
  1. Invermore lough surrounded by Connemara bogland and low hills.
    Loch Inbhair Mór (Invermore), part of the Invermore fishery system near Cashel, Connemara.
  2. Terrain map of the venue
    Terrain map
About this water

Historically important Connemara sea-trout fishery, documented alongside Owengowla in Gargan et al.'s long-running monitoring programme as one of the systems that collapsed in 1989 and failed to recover substantially. The research explicitly links the collapse to the onset of marine salmon farming and exceptionally low marine survival during the sea-lice era. This is a place with real history but a documented collapse, so it's best approached as a heritage story rather than a straightforward modern destination. If the current sporting value does not match the historical fame, say so clearly rather than trading on nostalgia. For 2026 this is a catch-and-release fishery under the Wild Salmon & Sea Trout Tagging Scheme — all salmon and grilse must be returned.

Hatches & food

No venue-specific hatch data yet; as a lough-river system typical of Connemara's acidic-lough country, expect buzzers and terrestrials to dominate over rich upwing hatches, with the connecting river adding occasional spate-driven stonefly and sedge activity - treat this as a general expectation, not an observed hatch.

  • Lough system
  • Granite
Water quality (WFD)
  • EcologyUnknown
  • ChemicalUnknown
The full read · show the working · for Atlantic Salmon · confidence 85%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Erriffproxy
Directions
Seasons & zones
  • Salmon 1 February30 SeptemberC&R

Sea trout: Variable seasonal (2026)

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