Noticed stationary structure on mountainside of national forest land with no tracks or visible way of having gotten to location

While in Somers by Flathead Lake I noticed a large dark non snow covered structure on the mountain side. This mountain is land that is not allowed to be accessed with gas powered vehicles and had just had fresh snowfall. This structure was stationary and I did not witness it get to its standing location but there is no evidence of tracks or snow disruption showing how it got there. There are two avalanche appearing areas below the corners of the structure that would be consistent with a landing large structure. No lights or motion was seen around the structure. It was there for several hours and I had left the area and am unsure if it is still presently there. My spouse saw the same structure at what we believe is the same location from Bigfork. I saw this structure while with a friend who agreed that it did not make sense that an object that large would be on that mountain. I have never witnessed UFO nor do I claim to have ever experienced an interaction with extraterrestrial but I do believe in extraterrestrial beings and believe that this structure may very likely be an extraterrestrial vehicle of some sorts.