Oregon Trail Scenic Byway

The main Oregon Trail from Three Island Crossing to Boise was the primary route utilized by the emigrants for the first 10 years of the trail. Those emigrants who could not cross the Snake River were forced to follow the south side of the Snake River on a
route known as the South Alternate. Freight and stage roads to the railroad in northern Utah utilized much of the Oregon Trail for many years. The Oregon Trail continued to be used long after the building of the railroads across southern Idaho, even into the early 1900's.