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On the western edge of the loop, heading south from Lyme to Canaan on the Grafton TPK road....that road is all dirt from the Dartmouth ski-way to Canaan. Sometimes it's mudy as well, as there is swamps and the road bed is low. If by chance it has recently been graded, it will be a nightmare for anyone not running knobbed tires...
Of course the KLR would love it