A culvert replacement project in Newtown will continue for as long as possible through the winter.  The state Department of Transportation wants the work done by the end of April on the 3-million dollar project along Mile Hill Road.  Construction is being done in two phases allowing two-way traffic through the work site.  A 40-foot-deep trench will make way for a seven-foot-diameter reinforced-concrete culvert to carry Deep Brook beneath the road.