Engineering News-Record » Caltrans has halted work on a $25-million I-5 bridge-replacement project, north of Redding, as it looks for the cause of a 1.5-in. lateral movement of the unfinished structure’s 400-ft-long arch. Surveys late last year verified the arch’s movement, first reported by employees of Benicia, Calif.-based contractor Golden State Bridge, according to Caltrans.