History The first Europeans explored the Milner area in Cassia County in 1811. It was trappers who initially developed the Oregon Trail, which ran on the county's northern border. The Raft River's junction with the Oregon Trail marked the split for the California Trail.
History The first Europeans explored the Milner area in Cassia County in 1811. It was trappers who initially developed the Oregon Trail, which ran on the county's northern border. The Raft River's junction with the Oregon Trail marked the split for the California Trail