(Portland, OR)  --  Police in Benton County say they've found the vehicle of a missing Brownsville woman submerged in the Willamette River.  Deputies say search teams and family members found Sue Durheim's truck in the river near the Hewlett Packard campus north of Corvallis yesterday.  Investigators believe the truck went off Highway 20 into the river during icy conditions Monday.  Deputies are returning to the scene today to attempt to retrieve the truck from the water.  Family members reported Durheim missing Monday after she failed to show up to work.