Massacre Rocks State Park

These towering basalt outcroppings along the Snake River created a dramatic bottleneck for Oregon Trail emigrants, who named the site after fearing Indian attacks in the narrow passage. The rocks actually served as a vital landmark and rest stop, with Register Rock bearing hundreds of carved pioneer names from the 1840s-1860s. Today, interpretive trails wind through the formations while the visitor center displays Oregon Trail artifacts and explains the area’s geological history.

Located 10 miles southwest of American Falls via I-86, the park offers excellent access to both the rock formations and Snake River. The main interpretive trail is an easy half-mile loop suitable for all visitors. Summer temperatures can be extreme, making spring and fall ideal for exploration. The nearby Snake River also provides fishing and boating opportunities.

Oregon Trail's dramatic rock gateway