Sphere over Bridgeport, CA

The report, as filed

I was camping along Highway 108 on top of Sonora pass (@ 9,350 ft. elevation in the Sierra Nevada's) near Bridgeport, California, in the national forest 6/20/18. I just so happened to look up to the sky and observed a white circular 3 dimensional sphere floating along at what I thought to be about 35,000-40,000ft (possibly higher) in altitude at roughly the same speed as a airliner, and along the same flight path as previous air traffic earlier that day. It was heading northeast. I was obstructed by the forest trees so could only observe for about 5 seconds. It was completely silent, and I was really taken back by that, it actually kind of scarred me. The sphere dimensions took up about as much space as a 747. About 90 seconds later a regular airplane continued along that same flight path as noisy as they always are. 1st time seeing a UFO. Witness elects to remain totally anonymous; provides no contact information. PD

Held as-reported from National UFO Reporting Center (record NUFORC #142003). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.