Wow thats too funny, I did something almost identical late this summer, except it was a 70' white pine, standing dead for a year, and girdled a third of the way up by cables and chain they had used year after year to hoist their dock out of the lake. It was on Lake Winapasaukee in NH. Was fun, it was on an island so they hauled us and all our gear out on a boat, may be doing some snowmobile-access removals at the same site this winter. :-D