The 225 meter long, 73035 dwt bulk freighter went aground on the Columbia River near Rainier, Oregon.  The Corviglia had completed loading a cargo of soybeans and was waiting for a river pilot when the tide went out leaving the vessel stuck on the river bottom.   When the tide returned, the vessel was able to refloat itself and proceeded to an anchorage where the vessel was inspected for damage.   No reports of injuries, damage or pollution released.   Reports state the Corviglia was bound for China.