Cedar River

Question for those who've paddled the Cedar: I just did the entire length of the Sammamish River/Slough in my sea kayak, which was delightful. I'm wondering how much of the Cedar is relatively flat enough for this type of boat, which can handle occasional fast water, but no real whitewater. Thanks! PS just biked the trail to get a look at this route, and it's definitely too swift for a sea kayak, at least the upper part. Looks fun for a river kayak though, being careful about the log jams.