Portions of western Washington state have experienced a month’s worth of rain within the past few days, causing historic flooding, damaging mudslides and more than 100,00 people facing potential evacuations.

About 78,000 residents of a major agricultural region north of Seattle were ordered to evacuate the Skagit River’s floodplain, officials said

Severe flooding in western Washington state hit communities along the Skagit River, leading to mass evacuations assisted by National Guard troops. Levees were tested as rain levels reached historic highs.

Swollen rivers led to floods in numerous counties and evacuation notices for several cities, though some have been rescinded. Most of the rivers’ levels crested between Wednesday night and early Friday morning and while some didn’t beat previous records, most were close.

The urgency went up a notch in Mount Vernon Thursday night, amidst concerns about whether the levees and dikes will be able to hold a record crest.

A powerful atmospheric river has triggered historic flooding across western Washington, forcing evacuations as the Skagit River nears record-shattering levels and communities brace for widespread damage.

Residents and emergency crews in towns along the rain-engorged Skagit River in western Washington state braced on Friday for potential levee failures while National Guard troops assisted in evacuations after days of severe flooding in the Pacific Northwest.

Authorities are going door-to-door in South Prairie, Washington, in Pierce County, urging residents to leave their homes immediately as water rises there. The Pierce County Sheriff’s Office previously said that at least 25 people have been rescued in the county since Wednesday, including in South Prairie.