I wouldn't think going up versus down would make much difference since there is no actual climbing involved. Says the guy who has not done it.
Sounds like crossing the river is a little spooky at this point, but maybe by the time you get there it will have calmed down. I crossed last September without issue.
San Joaquin crossing:
https://www.flickr.com/photos/68745971@N06/53209918557/in/album-72177720311426402/
