Everybody in that picture knows they're on a body-recovery mission, only organized to give the family closure. By the time Jacob's bike was discovered it was already too late. If he fell in and made it to the other side hypothermia was not far off. As the old saying goes, there are worse ways to go than doing what you love, and it's clear his passion was to be in Nature.  If you gave him the choice, would he have rather been taken out by a drunk driver, or the river?

Probably the most dangerous part of his trip, riding along the highway, was already done. That may have put his guard down, or he may have just been tired, and slipped. I'm sorry to have criticized the park admin'. They did everything that might have made a difference. I grieve along with his family. Perhaps the park could rent out EPIRB units? Water-immersion activation would be a plus.

Thanks to all those who put so much into this search. There were so many times in my youth that could have been me.