Kreppa, is the name of deep and wide glacial river that has its source in the west part of the glacier Brúarjökull and joining Jökulsá by Herðubreiðarlindir. In August 1999 there was a flood in the rivers Kreppa and Jökulsá á Fjöllum. This flood, believed to be the greatest in the area for almost a hundred years, caused extensive damage to vegetation at Herðubreiðarlindir, cleared a path for a new branch out of Kreppa, and remodelled the landscape in other ways. The swollen rivers breached the road at Grímsstaðir á Fjöllum and Öxarfjörður, and swept the bridge across the river Sandá in Öxarfjörður out to sea.