Caddisflies
Gammarids
A short, limestone-influenced river draining Lough Melvin to the sea along the Leitrim–Donegal border, the Drowes is one of Ireland's earliest salmon waters — it traditionally yields the first Irish salmon of the year, taken on or soon after the 1 January opening. Spring fish run from January through May; grilse follow from late May. Being lough-fed, the river is steadier than a true spate stream, yet it still rises and clears within a few hours of rain — fish it as it drops, working the named pools methodically with a fly swung across and down. It is exceptional sea trout water from spring onward; the famous Melvin salmonids — gillaroo, sonaghan and ferox — belong to the lough, while the Drowes itself is migratory-fish water. For 2026 the river is open: salmon may be retained from 1 June to 31 August under the Wild Salmon & Sea Trout Tagging Scheme and the season bag limit, with catch-and-release at other times.
EPA monitoring of the Drowes confirms mayflies, stoneflies, caddis, aquatic diptera and freshwater crustaceans including gammarus are present. This is kick-sample presence evidence only — it doesn't establish emergence timing or a visible hatch.
Famous for "exceptional sea trout" alongside early-season salmon. Short Lough Melvin outlet — sea trout are part of the core identity, not a footnote. Melvin's unique salmonids (sonaghan, gillaroo, ferox) add ecological distinction.
- Limestone