Paddled Castle yesterday and there was some new wood. As 'kayak4gas' said, drive a little past the music school and take your next left for a nice put-in. There is a large tree visible from bridge right after that put-in that can be snuck on the right.
The new wood is not far after the house with the low-head dam. There is an aspen 3/4 across the river that can be snuck on the right, but a terrible log with branches in the drop directly below. It is hard to see from above, but the aspen is a good indicator. You can easily portage on the right side of the downed aspen.