As of Thursday, the summit date has been pushed to August 21.
Email from Tandem that same day:
ANNOYING update for everyone involved: we made it across two swift stream fords this morning, then reached one rushing, waist deep one we couldn’t safely make it across. The rain is predicted to continue for the next four days, and there are two more bad fords ahead. We ended up having to hike a few miles out a flooded logging road and get a shuttle out.