Massacre Rocks State Park

Massacre Rocks State Park is a state park along the Snake River in Power County, Idaho, covering roughly 990 acres. The park includes volcanic rock formations, hiking trails, a disc golf course, and several recreation areas next to the river.

The site witnessed an armed conflict between Oregon Trail settlers and Shoshone people in 1862. The confrontation resulted in deaths on both sides and shaped how this section of the route was remembered.

Register Rock carries carved names and dates left by travelers who paused here during their westward journey in the 19th century. The inscriptions offer a direct glimpse into the individuals who moved along the Oregon Trail and show how this stopping point mattered to those passing through.

The park offers camping areas, boat ramps, and fishing spots accessible from Interstate 86. The site remains open daily, and trails wind through open terrain with views of the river.

The rock formations were carried here during the Bonneville Flood, when water from a prehistoric lake swept across the region. The force of the flood was strong enough to move entire boulders over long distances.

Location: Power County

Inception: 1967

Website: https://parksandrecreation.idaho.gov/parks/massacre-rocks

GPS coordinates: 42.72669,-112.93300

Latest update: December 5, 2025 22:29