While floating in lake tahoe off shore around 100 yards waiting to dive. Myself and about 4 other divers looked up in the blue sky watching a plane contrail flying very high. I spotted a oddly white bright star slowly moving a great distance above the contrail. This object was moving from the west to the northwest. This object was very very high. We also noticed that it being morning time, this object was white-bright like. No other stars or moon was seen in the sky. I would like to know what it was?