The River Moriston () is a river in Inverness-shire, Scotland. It flows broadly east-north-east from the outfall of the dam at Loch Cluanie to Loch Ness. Its waters and those of its tributaries have been harnessed to generate hydro-electric power. Route The River Moriston begins just below the dam at the eastern end of Loch Cluanie. Flow in the river is maintained by releasing compensation water from the loch. The A887 road from Kyle of Lochalsh to Loch Ness closely follows the course of the river for much of its length, and is on the north bank at this point. A small river, the Allt nam Peathrain, flows southwards to pass under the road and join the channel on its left bank. At Bun Loyne, a bridge carries the A87 road over the river, as it heads southwards to Glen Garry and the River Garry. Below the bridge, the River Loyne joins on the right bank. This is largely compensation water released from the dam at the eastern end of Loch Loyne. The A887 road crosses to the south bank at Ceannacroc Bridge. The road formerly crossed the old bridge, constructed by Thomas Telford in 1808-1811, and located a little further downstream. It consists of a main span of for the river and a flood arch of . The river sweeps round in a large bend, where it is joined by the waters of the River Doe and its tributary the Allt Bhuruisgidh, both of which are dammed further upstream. The main channel continues in an east-north-easterly direction, past the hamlet of Tomchrasky on its northern bank. There is a hatchery on the right bank, and then the A887 crosses to the left bank at Torgoyle Bridge. A bridge was constructed here in 1811 by Telford, but in 1818 was destroyed by a flood. A temporary wooden bridge was put in place to maintain the route, and the present three-arched structure was completed in 1823, to the design of Joseph Mitchell, who was Telford's principal inspector. The outside two arches span while the centre one, which is wider and higher, spans . The is extensive forest on both banks of the river, which gradually widens as it becomes part of Dundreggan Reservoir. A dam impounds the water at its eastern end, and a hydro-electric power station is located on the south bank close to the dam. The river narrows again,