So Where Is This Tree In Solid Rock?

So where is this tree? Atop a mountain out west between Laramie and Cheyenne Wyoming. Check out its interesting history here:
http://www.roadsideamerica.com/tip/11660 Railroad builders stopped to water it when passing it by. Cool!
Wonder if it is still alive....

Check out this postcard here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290576899231