Rain is one thing, but despite the rain Oregon is almost dead-last among all the states in terms of flood risk. It gets constant drizzles, not sporadic deluges.
I'll be relieved when I hear that they did it without killing anyone. Considering they didn't bother to work out how to handle floods before they put people's lives at risk everywhere else, it's not all that reassuring that they're now going to YOLO it in Portland