Bill Penland from Ottawa, KS on 10/16/2012 6:23:23 AM:
A buddy and I rode the trail end to end (Clinton to Machens) this past Weds-Sat. We had much trepidation about this section of trail due to this thread, but thankfully never flatted. We did use a lot of caution from roughly Portland to Dutzow to try to ride over NOTHING organic - no clippings, no leaves, no branches, etc.
Happily we got through without issue - however, next afternoon I DID notice one thorn in my outer tire rubber. It hadn't penetrated through to the tube, and since I saw it in the afternoon, I may well have picked it up somewhere further east of Dutzow (the start of our last day).