River Cassley

The River Cassley rises on Ben More Assynt in northern Scotland’s Sutherland region. It flows south-east for about 25 kilometres before meeting the River Oykel at Invercassley. Together they form the Kyle of Sutherland, which later receives the River Shin and River Carron. The Kyle continues east to Dornoch Firth and the North Sea. A single road bridge crosses the Cassley at Rosehall, just above its junction with the Oykel. The Cassley is best known for its salmon and trout fishing, attracting anglers throughout the season. Beneath its clear waters lives a resident population of freshwater pearl mussels. The lower river and its banks belong to the Achaness Hotel at Rosehall, which offers rooms and ghillies to visiting fishermen. Glen Cassley, the steep-sided valley the river carves, holds Ordnance Survey’s least-sold map sheet. The entire catchment lies within some of Scotland’s most remote and scenic landscapes. Visitors reach the river via the A837, where the bridge at Rosehall marks the start of the lower reaches. Anglers walk the banks to cast for salmon or trout, while others explore Glen Cassley’s waterfalls and heather moorland. The Achaness Hotel provides a base for fishing parties and offers views across the Kyle of Sutherland. The river’s quiet flow and surrounding hills make it a peaceful place to watch wildlife or simply stand by the water.