Glenns Ferry Historical State Park
Historic Oregon Trail River Crossing on the Snake River in Idaho — State Park Preserving the Most Dangerous Crossing Point on the Entire Oregon Trail, Where Thousands of Emigrant Wagons Forded the Snake River at Three Island Crossing, Oregon Trail History Center With Interpretive Exhibits and Living History, Annual Three Island Crossing Re-Enactment in August, Campground With Full Hookups on the Snake River, Fishing and Swimming in the Snake River, Hiking Trails Through Desert Landscape and Along the Historic Trail Route, Near Glenns Ferry Elmore County Southern Idaho Snake River Plain
Three Island Crossing State Park (also known as Glenns Ferry Historical State Park) is a state park in Glenns Ferry, Elmore County, southern Idaho, managed by Idaho Department of Parks and Recreation. The park preserves the most critical and dangerous river crossing on the entire Oregon Trail, featuring the historic Three Island Crossing where thousands of emigrant wagons forded the Snake River — those who crossed successfully followed a better route to Oregon while those who failed were often swept away, an Oregon Trail History Center with interpretive exhibits documenting the crossing and the broader emigrant experience, the annual Three Island Crossing Re-Enactment in August — a dramatic recreation of the actual wagon and livestock river crossing, a campground with full hookups on the banks of the Snake River, fishing and swimming in the Snake River, hiking trails through high-desert sagebrush landscape and along the historic trail route, and visible trail ruts and emigrant artifacts preserved in the landscape.
The crossing decision was life-or-death — emigrants who successfully forded the Snake River here gained access to a better, greener route to Oregon with more water and grass. Those who couldn’t or wouldn’t cross were forced onto the brutal South Alternate Route through waterless desert.
The August re-enactment brings this history to life — horses, wagons, and livestock actually cross the Snake River at the historic fording point, giving spectators a visceral understanding of the danger and determination that defined the Oregon Trail experience.
Things to Do
- Oregon Trail crossing — historic site
- History Center — exhibits, artifacts
- Re-enactment — August crossing
- Camping — full hookups, Snake River
- Fishing — Snake River
- Trail ruts — visible in landscape
Park Information
| Feature | Details |
|---|---|
| Location | Glenns Ferry, Elmore County, ID |
| Trail | Oregon Trail — Three Island Crossing |
| Event | August re-enactment |
| Camping | Full hookups on Snake River |
| Fishing | Snake River |
| Managed By | Idaho Dept. Parks & Recreation |
| Coordinates | 42.9500° N, 115.3000° W |
Frequently Asked Questions
Wildlife & Nature
Glenns Ferry HSP — at the Three Island Crossing — the most famous Snake River crossing on the Oregon Trail. The park’s Snake River, desert, and islands support white sturgeon (prehistoric fish), bald eagles, and mule deer.
Nearby Attractions
Glenns Ferry — adjacent. Snake River — at the park. Elmore County — surrounding.
What is Three Island Crossing on the Oregon Trail?
Three Island Crossing in Glenns Ferry, Idaho was the most critical and dangerous river crossing on the entire Oregon Trail — emigrants who successfully forded the Snake River gained access to a better route to Oregon. Today, Three Island Crossing State Park preserves the historic site with an Oregon Trail History Center, annual August re-enactment with actual river crossings, camping with full hookups on the Snake River, and visible trail ruts. Managed by Idaho Parks and Recreation.
Last updated: May 2026
Park Location
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