Glenns Ferry was one of the most famous river crossings on the Oregon Trail. Pioneers forded the Snake River at the Three Island Crossing until 1869, when Gustavus “Gus” Glenn constructed a ferry about two miles upstream, to expedite freight and transport emigrants. His boat cut nearly twenty miles from the former route.
Three Island Crossing State Park is home to The Oregon Trail History and Education Center where visitors can learn about pioneer emigrants and Native American history. The city has both rail and trucking services available.