Witnessed a large object fly through low clouds in a small canyon.

I was walking towards my car in an easterly direction along Aggie boulevard (Utah State University campus) looking up at the Bear River Mountains. From my location, I had a view of the entrance to Logan Canyon and a partial view of the entrance to Dry Canyon (just south of Logan Canyon). At this point in time the mountain summits and valleys were covered in a thick dark cloud cover. The sky had little to no cloud cover just west of the mountains.
I momentarily saw a large object, about the size of a small suburban home, fly through the clouds in Dry Canyon. It moved southwards across the canyon, then quickly upwards as it approached the southern side of the canyon. The object was obscured by the clouds, but I could make out a general grey diamond-like shape; however the boundaries seemed almost smudged. It seemed to have a partial faint red color to it as well. This occurred within seconds. I expected the object to emerge from the clouds and reveal itself as some kind of plane, however I did not see it again. It unfortunately happened too quickly for me to capture any form of video/images. I checked local flight radars about 10 minutes after the observation and did not find any local aircrafts flying through the area at that time/location.