The Department of Environment and Conservation has announced that effective April 2013 a diversion is in place on the Munda Biddi Trail immediately west of Walpole. This sounds like a diversion which is affecting the Bibbulmun Track as well.
The map of the diversion is available for download from my Dropbox and further details are also posted on my blog.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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