Moose Alley is on Buttermilk.  Photos of it (taken on March 28, 2017) are below; click on images to enlarge.  See this Aspen Times video which covers the Danny Hawks Loop, Devil's Gut, Moose Alley, and World's Longest Tree Trail:  "The Drop-In:  Buttermilk tree trails," February 26th, 2018  https://www.youtube.com/watch?v=JgEe-2vjUXI   Also, see this video:  https://www.youtube.com/watch?v=kSQkGkkOCzU

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This sign at one time was posted at the Guest Services hut on top of Buttermilk.