I will take a look at my copy of Soggy Sneakers and Paddling Oregon and let you know what they say. For specific beta you are going to need someone who has run it recently.
I would try posting on PDX kayaker's PDXkayaker.org- Portland, Oregon Boating Community
to see if anyone could help you out. Also the WKCC has a website with contact info, and they are based a bit further South, so someone there could be of assistance.
I haven't been down there in years so my memory is kind of suspect.