On my way to Montana I stopped at Massacre Rocks State Park for a quick overnight stop to rest and check out the area in the morning which include Register Rock before heading to Montana.
Massacre Rocks State Park is located along the Snake River west of American Falls, Idaho. It contains a configuration of boulders along the south bank of the Snake, known alternatively as Massacre Rocks, "Gate of Death," or "Devil's Gate." Massacre Rocks was a well-known site on the Oregon Trail and California Trail during the mid-19th century. Immigrants gave the name Massacre Rocks to the trail's narrow passage through the rocks. The name stemmed from the fear of a possible ambush by Indians. The pages of some immigrants' diaries indicate that settlers in five wagons clashed with the Shoshoni just east of the rocks, on August 9 and 10, 1862. The fight involved four wagon trains; 10 immigrants died in the fighting. The skirmishes actually took place east of the park, and not at Devil’s Gate as is commonly believed, but the undeserved name stuck. Geologically the park was created during the repeated volcanic activity on the Snake River Plain. The rocks were deposited in their present location at the end of the last ice age some 14,500 years ago, during the catastrophic deluge known as the Bonneville Flood, when most of Lake Bonneville surged down the Snake River. The rocks are all that is left of an extinct volcano; they were often used as campsite for wagon trains along the trail. Many of the immigrants carved their names and dates on the rock face, which is now called Register Rock and is protected by a shelter. The passage through the rocks is now the route of Interstate 86 along the south edge of the park.
On the way out I also checked out Register Rock part of Massacre Rocks State Park, it was an emigrant campground where travelers inscribed their names on basalt boulders. The largest of these bolder is now sheltered by a pavilion, with other inscribed rocks nearby. One of the cool inscribed rock is at the end of the video that was done by a child.
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