Mendenhall glacier is retreating. Taku glacier is advancing. Lived in Juneau for 6 years. Never saw anything like this. A big chunk must have cleaved off and sent a huge wave across the lake and down the river. Looks like the apartment is going next.
That would be the same Mendenhall Glacier that sits on an extinct forest...that it covered when it was advancing about 1,000 years ago.