I talked with Barb about this, hope it is ok to add a few comments.
This rapid is also known as "exit rapid", since it is the last, fairly long (200'), rapid in the typical GW canal run. At the bottom one turns left to return to the main river channel.
Besides eddy hopping, the rapid has three straight-ish routes down: river left, center, and river right. On the river right run, about 20-30' upstream from the bottom, and about 6' off of the rocks on river right, there has been a stick sticking out of the water for some time now. As I recall, the part sticking out above the water is only about 2-3" in diameter. Barb thinks that this stick is attached to the log that caught Alf and pulled him under.
I am very, very, thankful that Alf is still with us.
Jackie