A short, dramatic river tumbling into Killary Harbour through some of the wildest country in Connemara, and a declining salmon system where every fish goes back alive as a matter of course. Aasleagh Falls is the landmark every angler who's fished it remembers first. The Erriff is flashy and entirely spate-dependent, answering upriver rain within hours and fishing brilliantly as it clears. Salmon run from February; grilse and sea trout from June through September, conservation-minded catch-and-release throughout. Fish the pools methodically on the drop, working a sunk-tip through the broken water where sea trout hold. The system takes in Tawnyard and Derrintin loughs alongside the eight miles of river itself, split into nine numbered beats at a low rod density — two to three rods a beat — that keeps the fishing genuinely uncrowded.
The Erriff is a short, high-energy Connemara spate river: 33 km total length from the confluence of the Owenree and Owenmore in Glennacally, draining only 163 km² but with a mean discharge of about 8 m³/s concentrated into a confined glacial valley running west-southwest beneath Mweelrea and the Sheeffry Hills. Bedrock is Dalradian quartzite and schist of the Connemara Complex, and the bed is dominated by durable boulder and cobble delivered by glacial legacy deposits. Expect step-pool and plane-bed reaches alternating with forced pools where the channel is pinned against bedrock outcrops. Near the mouth at Aasleagh the river drops 3.5 m over a 20 m-wide block waterfall into the Killary Harbour fjord head — a natural migration barrier. Bed mobility is stable above the main step-pool reaches and moderate in the lower glides.
Wading: Wet boulder slabs and Aasleagh Falls plunge pool
EPA kick-sample monitoring of the Erriff (2009-2017) confirms mayflies, stoneflies, caddis, midges, blackflies and craneflies, and freshwater shrimp (Gammarus) are all present in the aquatic food base. This is presence evidence from monitored waterbody segments only, not a record of emergence timing, abundance, or a visible hatch on the water.
Classic west-coast spate river through Aasleagh Falls. Sea trout are part of the core mixed-migratory identity. Aasleagh Lodge has historically promoted sea-trout fishing alongside salmon. Spate-dependent.
- Granite
- Confined
- Step pool
- Plane bed