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.

A century-old Skagit River dike is holding as 75,000 residents remain under evacuation orders. Officials warn flood risks will continue into Saturday morning.

Washington and Oregon are bracing for major flooding and possible evacuations as an atmospheric river event brings heavy rainfall to an already saturated region

The Burlington Police Department and Skagit County Emergency management issued a city-wide evacuation this morning, after initial reports that the Slough, part of the Skagit River watershed, has jumped its banks. The City has nearly 10,000 residents.

The floodwall in Mount Vernon is expected to be overtopped as the river swells. Authorities have told everyone within the river's 100-year floodplain to evacuate.

Mount Vernon Mayor Peter Donovan says the city is as prepared as possible for a potentially historic Skagit River flood, with downtown floodwalls deployed and Level 3 evacuation orders in place.

Communities along the Skagit River, from Sedro Woolley to Mount Vernon, are on high alert as two atmospheric rivers threaten major flooding.Mount Vernon's Mayo

The U.S. National Weather Service is predicting historic flooding for Skagit County. Upriver communities, including Rockport, Hamilton, Marblemount, and Concrete, are recommended to evacuate to high ground as soon as possible.

Floodwaters rushed into Burlington early Friday, prompting mass evacuations and leaving basements flooded and roads impassable.