The head of the School Building Committee said that tough winter weather has not derailed the timetable for building the West Bridgewater Middle-Senior High School. “There have been a few days when work couldn’t be done, but overall the project is right on schedule,” said Gary Keith, head of the committee. Keith said the first piece of steel for the project went up on Tuesday, with construction expected to be complete by the beginning of the 2015-16 school year. Ground was broken last October for the $64 million, 141,250-square-foot facility, which is being built on athletic fields at the rear of the existing building. Once completed, the old school will be demolished to make room for new athletic facilities. The entire project is expected to be completed by January 2016.