The Kid and I do the Lewis St. to Douglas float. Sounds like this is what you want to do. Watch out for the first big turn just below Lewis St. You'll want to walk your boat past this in this low water. Only BK is crazy enough to row this in low water! Oh yeah, and if you find a Cataract oar, please contact Cascade Bob! wink

The take out at Douglas Bar is probably your best bet. It's not free, though. You will need stop at the house at the locked gate and purchase an annual "written permission" use permit offered by the owners of this private property. It's $25 for the year. Heck of a deal, if you ask me.
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T.K. Paker