Each summer in the mountains above Juneau, Alaska, meltwater from the massive Mendenhall Glacier flows into mountain lakes and into the Mendenhall River, which runs through town.

Because the flooding has been a growing concern, city officials have installed emergency flood barriers along several miles of riverbanks.

The melting glacier is pouring water into a lake and river that runs through the state’s capital, threatening the area with historic flooding for the third straight year.