Route: Greenstone Ridge Trail (MI)
Eric Charette posted the route:
Original post on ericcharette.blogspot.com/2012/05/greenstone-ridge-trail-fkt.html
The Greenstone Ridge forms the geologic backbone of Isle Royale, which is one of America's least visited National Parks. The only way to get to the island is either by air or by sea as it is 90km away from the shores of Upper Michigan and 35km away from Grand Portage, Minnesota. The GRT traverses this ridgeline for 40.1 miles along the entire length of Isle Royale from the western terminus at the intersection of the Minong Ridge Trail (0.3 miles away from Washington Creek Campground) to the eastern terminus at the intersection of the Lookout Louise trail.
There are many reports of a park ranger from Amygdaloid (small island off of Isle Royale) who ran from Rock Harbor to Windigo in 2008 (documented in the personal log book of George Hite of www.eagleharborweb.net/ ) but did not traverse along the entire length of the GRT, but instead ran from Rock Harbor Lodge to the Windigo Campground. Apparently the ranger also ran back to Rock Harbor on the second day, which is a tremendous feat! There is also a claim posted on the BackPacker.com website www.backpacker.com/october-2010-50-mile-thru-hikes-greenstone-ridge-mn/destinations/14780 of "bstearns" running the GRT in 10 hours and 12 minutes. There are no other details of this report and while the aforementioned rules are mostly guidelines and since there is not sufficient information about this report, I can not validate the time. I have spoken with the National Park Service, several authors of books on Isle Royale, and numerous people on isleroyaleforums.com/ and no one can substantiate any faster times for the entire GRT.