I work with several licensed and insured tree services in the Denver area and we recently removed a large cottonwood tree from one of my customers backyard using a 90 ton crane. If you would like more information on crane removals please go to my website www.astumpman.com or you can cut and paste the following link to take you directly to my web page.  http://www.astumpman.com/crane_tree_removal_denver.html