The Lost River Valley derives its name from the Big Lost River, which cascades down from the mountains and navigates thru the rugged landscape. Upon reaching the Snake River Plain, the river loops through marshlands and mysteriously vanishes into the porous basalt formed by the last volcanic eruption in the area. This eruption was also responsible for the creation of Mount Borah, Idaho's highest peak! Located just a few miles North of Arco, Mt. Borah is one of only nine peaks topping out over 12,000 that draws between 3,000-5,000 climbers per year. Continuing along the Peaks to Craters Scenic Byway will lead you to the Craters of the Moon National Monument. The volcanic rock at Craters is relatively young, featuring domes, cinder cones, shields, lava flows, lava tubes, spatter ramparts, and pressure ridges created by molten lava. As one of the youngest volcanoes in the area, it is anticipated to erupt again within the next millennium, following the last geological event that took place approximately 2,100 years ago.
During your visit to the Lost River Valley, you will uncover many other natural attractions: excellent hiking opportunities, world-class fishing, and exhibits related to the history of atomic energy in the United States. For ATV enthusiasts, this region is known as the ATV Capital of the West, featuring five trails that wind through the breathtaking landscape.
Plan to stay for more than just a day or two, as there is an abundance of experiences to enjoy. Explore the truly unique region we refer to as the Lost River Valley.
