Free flu vaccines will be offered Thursday at a clinic sponsored by the Bridgewater Board of Health at Bridgewater-Raynham Regional High School. Laurie Keane, clerk to the board, said 60 doses are available for residents 18 and older. Pre-registration is required; to register, call the Board of Health at 508-697-0903. The clinic runs from 4 to 6 p.m. in the seating area of the school cafeteria. It is not necessary to bring insurance information, Keane said.