Commentator Scott Thybony once carried a 100 pound boat down the Grand Canyon to the Colorado River. But he says that doesn't even come close to the heaviest item ever lugged down to the bottom of the Canyon.
Scott Thybony is a Flagstaff based writer. His Grand Canyon commentaries are funded by the Grand Canyon Association, supporting education and scientific research for Grand Canyon National Park since 1932. On the web at Grand Canyon dot org.