CASSIA COUNTY, Idaho (KMVT/KSVT) – Idaho State Police are investigating a deadly crash on Saturday east of Declo. A 43-year-old woman from Colorado was driving westbound on Interstate 86 near milepost 12 in a red midsize car, according to Idaho State Police. At 2:17 p.m., the vehicle collided with a gray SUV driven by a juvenile from Boise. Both vehicles left the roadway and rolled over.