A portion of Bighorn Lake will be closed today as the search continues for two men missing after a boating accident over the weekend. A National Parks Service spokeswoman said Tuesday the area between dayboards 6 and 8 will be closed from 7 a.m. to 7 p.m., with future closures possible. Tammy Scoville of Billings was found dead after another man, Robert Ludwich, also of Billings, was found alive on shore Saturday night and taken to a Billings hospital.