Achness Waterfall

Achness Waterfall (Achness Falls) drops through a rocky gorge on the River Cassley beside the village of Rosehall in Sutherland, in the Scottish Highlands. Ordnance Survey maps label it Achness, while locals call it Cassley Falls. The name comes from the Gaelic "Ach-an-eas", meaning "field of the waterfall".

What will you see?

The river tumbles over a series of ledges and rapids. When the water is low, the lower drop looks like a thin white veil. After heavy rain the Cassley turns into a roaring torrent that fills the whole gorge. Woodland closes in on both sides, so the scene feels green and secluded, and you hear the falls well before you see them.

Can you watch salmon here?

The Cassley is a salmon river, and the ledge at Achness is a real obstacle for the fish. In early spring they gather below the falls and, according to anglers' accounts, wait for the water to climb above roughly 10°C before pushing upstream. Your best chance of seeing fish leap comes when the river runs high during the migration season.

How do you get to the falls?

Start at the Forestry Commission car park in Rosehall (grid reference NC 479 019), where a log cabin holds information displays. You have two options:

• Quick visit: a direct path from almost opposite the car park reaches the falls in about two minutes.
• Loop walk: cross the A837 bridge, follow the east bank upstream to the falls, then return along a minor road. The path is clear but sometimes narrow and rocky, with a few climbs and a steep flight of stone steps near the river.

No public transport serves Rosehall, so plan on arriving by car.

When is the best time to visit?

The falls look most dramatic after rain, when the river carries plenty of water. Spring and early summer give the best odds of spotting salmon. Wear shoes with good grip, because the rocks beside the river can be slippery.

What else is nearby?

Forest trails at Rosehall start from the same car park, so you can stretch the falls into a longer outing. The Cassley valley is a quiet corner of southern Sutherland, well suited to an unhurried day on foot away from the crowds.

Frequently asked questions

How long does it take to reach Achness Waterfall? About two minutes on the direct path from the car park. The full loop with the return along the minor road takes a few hours at an easy pace.

Are Achness Falls and Cassley Falls the same waterfall? Yes. Ordnance Survey maps use the name Achness, and locals say Cassley Falls.

Can you reach it by public transport? No. There is no public transport near Rosehall, so the easiest way is to drive to the Forestry Commission car park.

When is the best time to see salmon? During the migration season, especially when the water is running high and the fish try to clear the ledge.