2 injured after US 31 rollover. #MasonCountyNews #OceanaCountyNews By Rob Alway, Editor-in-Chief. SUMMIT TOWNSHIP (Mason County) — Two people were injured following a single vehicle rollover crash on southbound US 31 just north of the Oceana Drive (Pentwater) exit Friday morning. The crash, which occurred about 11 a.m., involved a Dodge Caliber sedan driven by a 38-year-old Indiana man and…