Three Island Crossing State Park is a history-focused public recreation area in Glenns Ferry, Idaho, United States, that interprets the site of a ford of the Snake River on the Oregon Trail.

The state park features camping, cabins, disk golf, and a visitors center with interpretive exhibits.

[3] The site was used as a river crossing until 1869 when Gus Glenn built a ferry across the river about 2 miles (3.2 km) upstream.

[3] The land was deeded from the city of Glenns Ferry to the Idaho Department of Parks and Recreation in 1968 and was formally opened to the public as a state park in 1971.

[2] Residential animals of this state park feature deer, waterfowl, fox, swans, songbirds, pelicans, eagles.