We stopped by the bridge to see it again today.
It is jacked up about 50 feet on the barge, and it will soon float down the Willamette and then be dropped into place.
Apparently there will be 15 feet of clearance under the Freemont bridge. That should be interesting to see.
I called the number for schedule update (503-988-4884) and the message there said the bridge would be moved on Friday. The Oregonian has originally said Thursday. So we will check again in the morning for current updates.

Thursday, Dec 27th – The barge carrying the arch is set to leave terminal 2 between 7:00 am and 9:00 am Friday December 28th and take about three hours to reach the installation point.