Snohomish River is flooding north of Seattle, Washington. That is where I-5 is closed due to flooding

 

Snohomish

Washington

    This is a map I was able to quote here to this site. You can see where I-5 is in relation to the Snohomish River and how the river crosses I-5 where it is flooding. The map might load a larger area if you click on it as well on your computer or other device.