CRYSTAL LAKE — Part of Route 31 was down to one lane Tuesday morning in Crystal Lake, while utility crews worked to replace a pole damaged in an earlier crash. The Crystal Lake Police Department sent an alert at 8:46 a.m. Tuesday to warn motorists that northbound traffic on Route 31 north of Three Oaks Road was down to one lane. The alert went on to say utility crews were replacing a pole that had been damaged in a car crash, and a spokesperson for the police department said the crash occurred Tuesday morning. Police did not immediately respond to calls seeking more information about the incident, but work was expected to conclude Tuesday afternoon.