The heavy rains of the last few days has stopped, but there is extensive flooding in Whatcom County (in the far northwest, against the Canadian border).
Interstate 5 is also closed overnight near Bellingham due to a mudslide.
Untitled picture of Hannegan Road, between Bellingham and Lynden (posted on the website of KGMI News). Looking at Google maps, I believe that the water is from Tenmile Creek nearby, that is flooding.
P.S. I’m not sure where this motorist is coming from, but it’s very dangerous to drive into or through running water, and even more so in the dark.