Driving east on i90 I saw a teardrop shape grey illuminated metal vessel raised in center. The vessel wobbled over tree line, flying dangerously/ illegally low for an aircraft then moved extremely fast and hovered over lake kachess then quickly came over freeway extremely low/ close to cars. No wings. No rotor. No sound. Looking for somebody driving on this part of i90 on aug 11 at 230 with dash cam. Never seen anything like this before.