You can also see Mr. Woodruff's monograph on the internet thanks to Bob Coller's blog "River Thoughts". http://huronriver.pinckneymich.net/huronportage1790.pdf
We missed Mr. Woodruff on our winter paddle last week, the dropping temperatures and flow ice kept him from a most desired visit.
Additional reading can be found at: http://www.verlenkrugermemorial.org/id8.html
To learn from the legends - The Capt'n