Not sure if I'm too late to add value here, but i walked that portage from the Darky River to Wicksteed 2 years ago.  It is precisely as Mad_Mat describes.  It is tucked into a little hold on the shore and it's easier to see, but still not easy, if you are moving from south to north on the river.  It within sight of the log jam and portage just a little further north on the River.  I don't think this portage is taken very often.