Since 2011, outburst floods from the glacial-dammed lake at Suicide Basin have been released into Mendenhall Lake and subsequently the Mendenhall River. The record setting flood of 2016 was at 11.99 feet. Flood stage is at 9′.
That record was broken this weekend, when the flood waters burst from Suicide Basin. The water level crested at 14.97 feet. Several homes along the river had the bank cut out from under them, with at least one collapsing into the rushing current.
It was estimated that water was flowing at 20,900 cubic feet per second down the Mendenhall River.