The Upper Haukadalsá is known as a good sea-run char river with the possibility of salmon. It is naturally cold, due to the high elevation of the catchment, which is also why it is difficult for salmon to thrive here. The Upper-Haukadalsá falls into Haukadalsvatn from its uppermost source by Jörfamúli, but on the way various streams flow into the river and make it the waterfall it is. The upper part of the river runs through a canyon, but further downstream the river is calmer and suitable for sea-run char/Arctic char. The lower part of the river, especially the estuary, is best for char fishing but the chances for salmon are mainly in the upper part.