Record floodwaters released by the nearby Mendenhall Glacier crested Wednesday in a river that flows through Alaska’s capital city with no immediate reports of major damage, though officials warned that high water would remain for several hours.

Residents in some parts of Juneau prepared to evacuate ahead of what could be a record surge of flooding as rainwater and snowmelt in a huge basin dammed by Alaska’s Mendenhall Glacier started to flow downstream toward the capital city.