Massacre Rocks State Park

A dramatic 990-acre state park along the Snake River defined by ancient volcanic boulders, historic Oregon Trail wagon ruts, and a challenging desert disc golf course.

Massacre Rocks State Park, located along the Snake River in Power County, Idaho, preserves a dramatic, boulder-strewn landscape shaped by ancient volcanic activity and a cataclysmic ice age flood. The park's distinct topography features a chaotic jumble of massive, smooth basalt boulders deposited roughly 14,500 years ago during the Bonneville Flood. This catastrophic event occurred when the natural dam at Red Rock Pass failed, sending a torrent of water from Lake Bonneville down the Snake River corridor with a flow estimated at four times that of the Amazon River. The surviving rock formations, including Devil's Gate Pass, are the remnants of an extinct volcano, sculpted and polished by the sheer force of the prehistoric deluge.

The area's human history is deeply intertwined with these geological barriers. For centuries, Shoshone and Bannock peoples utilized the gentle, accessible stretches of the Snake River for salmon fishing and seasonal gathering. During the mid-nineteenth century, the narrow passage between the basalt cliffs became a critical bottleneck on the Oregon and California Trails, known to emigrants as the "Gate of Death" or "Devil's Gate" due to their fear of ambushes. The name Massacre Rocks originates from a skirmish on August 9 and 10, 1862, when Shoshone warriors clashed with a wagon train, resulting in the deaths of ten emigrants. Today, visitors can walk the paved Wagon Rut Trail to see the physical depressions carved into the earth by thousands of heavy pioneer wagons. Just two miles from the main park area, Register Rock preserves a massive, sheltered boulder where emigrants carved their names and dates in axle grease and chisel, leaving a permanent record of their westward journeys.

Today, the 990-acre state park serves as a hub for both historical exploration and modern recreation. An 18-hole disc golf course winds through the sagebrush and basalt formations, widely recognized as one of the most challenging courses in Idaho due to its dramatic elevation changes and narrow fairways. Rock climbers frequent the sheer basalt cliffs, which offer numerous established sport routes, while anglers cast for trout and bass from the banks of the Snake River. The park features a visitor center with interpretive exhibits detailing the region's geological and pioneer history, alongside a 42-site campground equipped with water and electricity, as well as four heated and air-conditioned cabins. A pedestrian tunnel beneath Interstate 86 connects the main campground and river access to the historic trail ruts on the south side of the highway.