Allt Graad (Scottish Gaelic, Allt Grànnda, meaning "Ugly Stream") is a river in Easter Ross, Highland, Scotland, flowing 9 km (5½ miles) from Loch Glass through Glen Glass past Evanton into the Cromarty Firth. It meets the sea about a mile from the mouth of the River Sgitheach. Between Glen Glass and Evanton it flows through the Black Rock Gorge, associated in local tradition with the Lady of Balconie. Allt Graad is the official Ordnance Survey name and that of Highland Council, but it is also known by other names, such as the "River Glass", "Allt Grande", and the archaic Anglicization, "Aultgraad".
